diff --git a/CHANGELOG.md b/CHANGELOG.md
index d90cfbf..742929a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,19 +1,27 @@
 # Changelog
 
-## 6.0.0-dev
+## 6.1.0 (August 31, 2026)
+
+- Added a `{path}` output template for preserving directories matched by glob inputs ([#43](https://github.com/vseventer/sharp-cli/issues/43)).
+- Added percentage-based dimensions to the `resize` command ([#49](https://github.com/vseventer/sharp-cli/issues/49)).
+- Updated `sharp` dependency to 0.35.4.
+
+## 6.0.0 (August 21, 2026)
 
 - Added [`--limitInputChannels`](https://sharp.pixelplumbing.com/api-constructor/) input option.
 - Added `--dry` option to process images without writing output files.
 - Added [`--exact`](https://sharp.pixelplumbing.com/api-output#webp) output option.
 - Added [`--keepGainMap`](https://sharp.pixelplumbing.com/api-output#keepgainmap) and [`--withGainMap`](https://sharp.pixelplumbing.com/api-output#withgainmap) output options.
-- Added `--print` option to print input and output metadata as JSON ([#98](https://github.com/vseventer/sharp-cli/issues/48)).
+- Added `--print` option to print input and output metadata as JSON ([#48](https://github.com/vseventer/sharp-cli/issues/48)).
 - Added [`--tune`](https://sharp.pixelplumbing.com/api-output#avif) output option.
 - Added [`--withDensity`](https://sharp.pixelplumbing.com/api-output#withdensity) output option.
 - Added [`--margin`](https://sharp.pixelplumbing.com/api-resize#trim) option to the `trim` command.
 - Removed `jpg` output format alias; use `jpeg` instead.
 - Added graceful handling of partial failures during batch image processing ([#98](https://github.com/vseventer/sharp-cli/issues/98)).
 - Fixes bug where format options could cause errors. Consequently, removed `jpg` output format alias; use `jpeg` instead ([#92](https://github.com/vseventer/sharp-cli/issues/92)).
+- Drop `must` dependency in favor of Node.js native `assert`.
 - Internal refactor from CommonJS to ESM.
+- Tightened `yargs` option configuration to require values.
 - Updated `sharp` dependency to 0.35.3.
 - Updated dependencies.
 - Requires Node.js 20.10.
diff --git a/README.md b/README.md
index 9936d7d..dc8dcf5 100644
--- a/README.md
+++ b/README.md
@@ -216,7 +216,7 @@ For more information on available options, please visit https://sharp.pixelplumb
 
 - The CLI supports input streams.
 - [Glob](https://www.npmjs.com/package/glob) patterns are allowed, for example `--input './images/**/*.jpg'`. Make sure you quote the pattern when using the CLI.
-- Supported output macros: `{root}`, `{dir}`, `{base}`, `{name}`, and `{ext}` (from [Node.js path](https://nodejs.org/api/path.html#path_path_parse_path)), for example: `--output {dir}` will overwrite original files.
+- Supported output macros: `{root}`, `{dir}`, `{base}`, `{name}`, and `{ext}` (from [Node.js path](https://nodejs.org/api/path.html#path_path_parse_path)), for example: `--output {dir}` will overwrite original files. Additionally, `{path}` is the directory relative to the non-glob portion of the input path.
 
 ```
 ┌─────────────────────┬────────────┐
@@ -227,6 +227,14 @@ For more information on available options, please visit https://sharp.pixelplumb
 └──────┴──────────────┴──────┴─────┘
 ```
 
+For glob input, `{path}` can be used in an `--output` template to preserve the matched directory relative to the non-glob portion of the input path:
+
+```
+Command: sharp --input './images/**/*.jpg' --output './output/{path}/{name}.webp'
+Match:   ./images/icons/example.jpg
+Output:  ./output/icons/example.webp
+```
+
 ## Related
 
 - [sharp](http://sharp.pixelplumbing.com/) - API for this module
diff --git a/cmd/compositing/composite.js b/cmd/compositing/composite.js
index 563878c..3a5a405 100644
--- a/cmd/compositing/composite.js
+++ b/cmd/compositing/composite.js
@@ -66,18 +66,22 @@ const options = {
     choices: [3, 4],
     default: 3,
     desc: "Number of channels of the blank overlay to be created",
+    nargs: 1,
   },
   "create.height": {
     desc: "Height of the blank overlay to be created",
+    nargs: 1,
     type: "number",
   },
   "create.width": {
     desc: "Width of the blank overlay to be created",
+    nargs: 1,
     type: "number",
   },
   density: {
     desc: "Number representing the DPI for vector images",
     defaultDescription: 72,
+    nargs: 1,
     type: "number",
   },
   gravity: {
@@ -88,6 +92,7 @@ const options = {
   left: {
     desc: "The pixel offset from the left edge",
     implies: "top",
+    nargs: 1,
     type: "number",
   },
   premultiplied: {
@@ -101,6 +106,7 @@ const options = {
   top: {
     desc: "The pixel offset from the top edge",
     implies: "left",
+    nargs: 1,
     type: "number",
   },
 };
diff --git a/cmd/operations/affine.js b/cmd/operations/affine.js
index 2e3aa6b..40c47be 100644
--- a/cmd/operations/affine.js
+++ b/cmd/operations/affine.js
@@ -45,21 +45,25 @@ const options = {
   idx: {
     defaultDescription: "0",
     desc: "The input horizontal offset",
+    nargs: 1,
     type: "number",
   },
   idy: {
     defaultDescription: "0",
     desc: "The input vertical offset",
+    nargs: 1,
     type: "number",
   },
   odx: {
     defaultDescription: "0",
     desc: "The output horizontal offset",
+    nargs: 1,
     type: "number",
   },
   ody: {
     defaultDescription: "0",
     desc: "The output vertical offset",
+    nargs: 1,
     type: "number",
   },
   interpolate: {
diff --git a/cmd/operations/blur.js b/cmd/operations/blur.js
index 83031d7..5050ec7 100644
--- a/cmd/operations/blur.js
+++ b/cmd/operations/blur.js
@@ -36,6 +36,7 @@ const options = {
   minAmplitude: {
     defaultDescription: 0.2,
     desc: "A smaller value will generate a larger, more accurate mask",
+    nargs: 1,
     type: "number",
   },
   precision: {
diff --git a/cmd/operations/clahe.js b/cmd/operations/clahe.js
index 117ef30..72c5938 100644
--- a/cmd/operations/clahe.js
+++ b/cmd/operations/clahe.js
@@ -39,6 +39,7 @@ const options = {
   maxSlope: {
     defaultDescription: 3,
     desc: "Maximum value for the slope of the cumulative histogram",
+    nargs: 1,
     type: "number",
   },
 };
diff --git a/cmd/operations/convolve.js b/cmd/operations/convolve.js
index 47b583f..04e94e7 100644
--- a/cmd/operations/convolve.js
+++ b/cmd/operations/convolve.js
@@ -48,11 +48,13 @@ const options = {
   scale: {
     desc: "The scale of the kernel in pixels",
     defaultDescription: "sum",
+    nargs: 1,
     type: "number",
   },
   offset: {
     desc: "The offset of the kernel in pixels",
     defaultDescription: "0",
+    nargs: 1,
     type: "number",
   },
 };
diff --git a/cmd/operations/modulate.js b/cmd/operations/modulate.js
index 3aa53e6..8b10b6d 100644
--- a/cmd/operations/modulate.js
+++ b/cmd/operations/modulate.js
@@ -30,18 +30,22 @@ import { pick } from "../../lib/utils.js";
 const options = {
   brightness: {
     desc: "Brightness multiplier",
+    nargs: 1,
     type: "number",
   },
   hue: {
     desc: "Degrees for hue rotation",
+    nargs: 1,
     type: "number",
   },
   lightness: {
     desc: "Lightness addend",
+    nargs: 1,
     type: "number",
   },
   saturation: {
     desc: "Saturation multiplier",
+    nargs: 1,
     type: "number",
   },
 };
diff --git a/cmd/operations/normalise.js b/cmd/operations/normalise.js
index eff86c2..d02311d 100644
--- a/cmd/operations/normalise.js
+++ b/cmd/operations/normalise.js
@@ -30,11 +30,13 @@ const options = {
   lower: {
     default: 1,
     desc: "Percentile below which luminance values will be underexposed",
+    nargs: 1,
     type: "number",
   },
   upper: {
     default: 99,
     desc: "Percentile below which luminance values will be overexposed",
+    nargs: 1,
     type: "number",
   },
 };
diff --git a/cmd/operations/sharpen.js b/cmd/operations/sharpen.js
index ccec3d6..a787d0d 100644
--- a/cmd/operations/sharpen.js
+++ b/cmd/operations/sharpen.js
@@ -40,27 +40,32 @@ const options = {
     alias: "flat",
     desc: 'The level of sharpening to apply to "flat" areas',
     defaultDescription: 1.0,
+    nargs: 1,
     type: "number",
   },
   m2: {
     alias: "jagged",
     desc: 'The level of sharpening to apply to "jagged" areas',
     defaultDescription: 2.0,
+    nargs: 1,
     type: "number",
   },
   x1: {
     desc: 'The threshold between "flat" and "jagged" areas',
     defaultDescription: 2.0,
+    nargs: 1,
     type: "number",
   },
   y2: {
     desc: "The maximum amount of brightening",
     defaultDescription: 10.0,
+    nargs: 1,
     type: "number",
   },
   y3: {
     desc: "The maximum amount of darkening",
     defaultDescription: 20.0,
+    nargs: 1,
     type: "number",
   },
 };
diff --git a/cmd/output.js b/cmd/output.js
index d100191..c504168 100644
--- a/cmd/output.js
+++ b/cmd/output.js
@@ -41,6 +41,7 @@ const options = {
     choices: [0, 90, 180, 270],
     defaultDescription: "0",
     desc: "Tile angle of rotation",
+    nargs: 1,
   },
   background: {
     defaultDescription: "rgb(255, 255, 255, 1)",
@@ -79,11 +80,13 @@ const options = {
   overlap: {
     desc: "Tile overlap in pixels",
     defaultDescription: "0",
+    nargs: 1,
     type: "number",
   },
   skipBlanks: {
     defaultDescription: -1,
     desc: "Threshold to skip tile generation",
+    nargs: 1,
     type: "number",
   },
 };
diff --git a/cmd/resizing/resize.js b/cmd/resizing/resize.js
index d9520dc..ee94331 100644
--- a/cmd/resizing/resize.js
+++ b/cmd/resizing/resize.js
@@ -27,17 +27,31 @@
 import constants from "../../lib/constants.js";
 import { pick } from "../../lib/utils.js";
 
+// Helpers.
+const resolveDimension = (dimension, metadataDimension) => {
+  if (dimension == null) return null;
+  if (typeof dimension === "string" && dimension.endsWith("%")) {
+    if (metadataDimension == null) {
+      throw new Error("Input metadata is required to resolve percentage");
+    }
+    return Math.round(
+      (metadataDimension * Number(dimension.slice(0, -1))) / 100,
+    );
+  }
+  return Number(dimension);
+};
+
 // Configure.
 const positionals = {
   width: {
     default: null,
-    desc: "Pixels wide the resultant image should be",
-    type: "number",
+    desc: "Pixels or percentage wide the resultant image should be",
+    type: "string",
   },
   height: {
     default: null,
-    desc: "Pixels high the resultant image should be",
-    type: "number",
+    desc: "Pixels or percentage high the resultant image should be",
+    type: "string",
   },
 };
 
@@ -94,6 +108,10 @@ const builder = (yargs) => {
       "$0 resize --height 100",
       "The output will be 100 pixels high, auto-scaled width",
     )
+    .example(
+      "$0 resize 50%",
+      "The output will be 50% of the input width, auto-scaled height",
+    )
     .example(
       '$0 resize 200 300 --background rgba(255,255,255,0.5) --fit contain --kernel nearest --position "right top"',
       "The output will be 200 pixels wide and 300 pixels high containing a nearest-neighbour scaled version contained within the north-east corner of a semi-transparent white canvas",
@@ -132,8 +150,10 @@ const handler = (args) => {
   // @see https://sharp.pixelplumbing.com/api-resize#resize
   return args["#queue"].push([
     "resize",
-    (sharp) => {
-      return sharp.resize(args.width, args.height, pick(args, optionNames));
+    (sharp, { metadata } = {}) => {
+      const width = resolveDimension(args.width, metadata?.width);
+      const height = resolveDimension(args.height, metadata?.height);
+      return sharp.resize(width, height, pick(args, optionNames));
     },
   ]);
 };
diff --git a/cmd/resizing/trim.js b/cmd/resizing/trim.js
index 06c55f3..ac3a17b 100644
--- a/cmd/resizing/trim.js
+++ b/cmd/resizing/trim.js
@@ -45,6 +45,7 @@ const options = {
   },
   margin: {
     desc: "Leave a margin around trimmed content",
+    nargs: 1,
     type: "number",
   },
 };
diff --git a/lib/cli.js b/lib/cli.js
index 1375a62..008aaea 100644
--- a/lib/cli.js
+++ b/lib/cli.js
@@ -140,6 +140,7 @@ export const inputOptions = {
     desc: "DPI for vector images",
     defaultDescription: 72,
     group: input,
+    nargs: 1,
     type: "number",
   },
   failOn: {
@@ -158,30 +159,35 @@ export const inputOptions = {
     desc: "Level to extract from a multi-level input (OpenSlide), zero based",
     defaultDescription: 0,
     group: input,
+    nargs: 1,
     type: "number",
   },
   limitInputPixels: {
     defaultDescription: 0x3fff * 0x3fff,
     desc: "Do not process input images where the number of pixels (width x height) exceeds this limit",
     group: input,
+    nargs: 1,
     type: "number",
   },
   limitInputChannels: {
     defaultDescription: 5,
     desc: "Do not process input images where the number of channels exceeds this limit",
     group: input,
+    nargs: 1,
     type: "number",
   },
   page: {
     defaultDescription: 0,
     desc: "Page number to start extracting from for multi-page input",
     group: input,
+    nargs: 1,
     type: "number",
   },
   pages: {
     defaultDescription: 1,
     desc: "Number of pages to extract for multi-page input",
     group: input,
+    nargs: 1,
     type: "number",
   },
   pdfBackground: {
@@ -199,6 +205,7 @@ export const inputOptions = {
     defaultDescription: -1,
     desc: "subIFD to extract for OME-TIFF",
     group: input,
+    nargs: 1,
     type: "number",
   },
   unlimited: {
@@ -222,6 +229,7 @@ const outputOptions = {
     desc: "zlib compression level",
     defaultDescription: 6,
     group: output,
+    nargs: 1,
     type: "number",
   },
 
@@ -259,6 +267,7 @@ const outputOptions = {
   "metadata.density": {
     desc: "Number of pixels per inch (DPI)",
     group: output,
+    nargs: 1,
     type: "number",
   },
   "metadata.exif": {
@@ -276,6 +285,7 @@ const outputOptions = {
   "metadata.orientation": {
     desc: "Used to update the EXIF Orientation tag",
     group: output,
+    nargs: 1,
     type: "number",
   },
 
@@ -283,6 +293,7 @@ const outputOptions = {
   withDensity: {
     desc: "Set output density (DPI) in EXIF metadata",
     group: output,
+    nargs: 1,
     type: "number",
   },
 
@@ -312,6 +323,7 @@ const outputOptions = {
     desc: "Quality",
     defaultDescription: "80",
     group: output,
+    nargs: 1,
     type: "number",
   },
 };
@@ -329,6 +341,7 @@ const optimizationOptions = {
     desc: "Quality of alpha layer",
     defaultDescription: "80",
     group: optimize,
+    nargs: 1,
     type: "number",
   },
 
@@ -338,6 +351,7 @@ const optimizationOptions = {
     defaultDescription: 8,
     desc: "Reduce bitdepth to 1, 2, or 4 bit",
     group: optimize,
+    nargs: 1,
   },
 
   // @see https://sharp.pixelplumbing.com/api-output#avif
@@ -356,6 +370,7 @@ const optimizationOptions = {
     defaultDescription: 256,
     desc: "Maximum number of palette entries",
     group: optimize,
+    nargs: 1,
     type: "number",
   },
 
@@ -371,6 +386,7 @@ const optimizationOptions = {
   delay: {
     desc: "Delay(s) between animation frames",
     group: optimize,
+    nargs: 1,
     type: "number",
   },
 
@@ -380,6 +396,7 @@ const optimizationOptions = {
     desc: "Level of Floyd-Steinberg error diffusion",
     defaultDescription: "1.0",
     group: optimize,
+    nargs: 1,
     type: "number",
   },
 
@@ -392,6 +409,7 @@ const optimizationOptions = {
     defaultDescription: "7 (GIF, PNG) / 4",
     desc: "Level of CPU effort to reduce file size",
     group: optimize,
+    nargs: 1,
     type: "number",
   },
 
@@ -408,6 +426,7 @@ const optimizationOptions = {
     defaultDescription: 8,
     desc: "Set bitdepth to 8, 10, or 12 bit",
     group: optimize,
+    nargs: 1,
   },
 
   // @see https://sharp.pixelplumbing.com/api-output#heif
@@ -422,6 +441,7 @@ const optimizationOptions = {
   interFrameMaxError: {
     desc: "Maximum inter-frame error for transparency",
     group: optimize,
+    nargs: 1,
     type: "number",
   },
 
@@ -429,6 +449,7 @@ const optimizationOptions = {
   interPaletteMaxError: {
     desc: "Maximum inter-palette error for palette reuse",
     group: optimize,
+    nargs: 1,
     type: "number",
   },
 
@@ -437,6 +458,7 @@ const optimizationOptions = {
     default: 0,
     desc: "Number of animation iterations",
     group: optimize,
+    nargs: 1,
     type: "number",
   },
 
@@ -552,6 +574,7 @@ const optimizationOptions = {
     defaultDescription: "0",
     desc: "Quantization table to use",
     group: optimize,
+    nargs: 1,
     type: "number",
   },
 
@@ -597,6 +620,7 @@ const optimizationOptions = {
   tileHeight: {
     desc: "Vertical tile size",
     group: optimize,
+    nargs: 1,
     type: "number",
   },
 
@@ -604,6 +628,7 @@ const optimizationOptions = {
   tileWidth: {
     desc: "Horizontal tile size",
     group: optimize,
+    nargs: 1,
     type: "number",
   },
 
@@ -628,6 +653,7 @@ const optimizationOptions = {
     defaultDescription: "1.0",
     desc: "Horizontal resolution",
     group: optimize,
+    nargs: 1,
     type: "number",
   },
 
@@ -636,6 +662,7 @@ const optimizationOptions = {
     defaultDescription: "1.0",
     desc: "Vertical resolution",
     group: optimize,
+    nargs: 1,
     type: "number",
   },
 };
diff --git a/lib/convert.js b/lib/convert.js
index 9a926f9..fb2aa23 100644
--- a/lib/convert.js
+++ b/lib/convert.js
@@ -23,6 +23,7 @@
 
 // Standard lib.
 import { createReadStream } from "node:fs";
+import { mkdir } from "node:fs/promises";
 import path from "node:path";
 import { pipeline } from "node:stream/promises";
 
@@ -55,26 +56,49 @@ const FORMATS = {
   ".webp": "webp",
 };
 
+// Resolve the non-magic portion of a glob to use as its relative path root.
+const getGlobRoot = (pattern) => {
+  const absolute = path.resolve(pattern);
+  const magicIndex = absolute.search(/[*?[{(]/);
+  if (magicIndex === -1) {
+    return path.dirname(absolute);
+  }
+
+  const prefix = absolute.slice(0, magicIndex);
+  return prefix.endsWith(path.sep)
+    ? path.resolve(prefix)
+    : path.dirname(path.resolve(prefix));
+};
+
 // Exports.
 export default {
   // Convert a list of files.
   files: async (input, output, context) => {
     // Resolve files.
-    const files = input.flatMap((input) => globSync(input, { absolute: true }));
+    const files = input.flatMap((pattern) => {
+      const root = getGlobRoot(pattern);
+      return globSync(pattern, { absolute: true }).map((src) => ({
+        root,
+        src,
+      }));
+    });
     if (files.length === 0) {
       throw new Error("No input files");
     }
 
     // Process files.
     const isBatch = files.length > 1;
-    const promises = files.map((src) => {
+    const promises = files.map(({ root, src }) => {
       const image = sharp(context.options);
       return pipeline(createReadStream(src), image)
         .then(() => image.metadata())
         .then((metadata) => {
           // Process output as a template.
-          const parts = path.parse(src);
-          const regex = /\{(root|dir|base|ext|name)\}/g;
+          const parts = {
+            ...path.parse(src),
+            path: path.relative(root, path.dirname(src)),
+          };
+          const regex = /\{(root|dir|path|base|ext|name)\}/g;
           let dest = output;
           let match;
           while ((match = regex.exec(output)) !== null) {
@@ -110,7 +134,9 @@ export default {
             ? transformer
                 .toBuffer({ resolveWithObject: true })
                 .then(({ info }) => info)
-            : transformer.toFile(dest);
+            : mkdir(path.dirname(dest), { recursive: true }).then(() =>
+                transformer.toFile(dest),
+              );
           return promise.then((info) => ({
             input: inputMetadata,
             output: { ...info, path: dest },
diff --git a/package-lock.json b/package-lock.json
index 704c9a1..82c9176 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,16 +1,16 @@
 {
   "name": "sharp-cli",
-  "version": "6.0.0-dev",
+  "version": "6.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "sharp-cli",
-      "version": "6.0.0-dev",
+      "version": "6.1.0",
       "license": "MIT",
       "dependencies": {
         "glob": "13.0.x",
-        "sharp": "0.35.3",
+        "sharp": "0.35.4",
         "yargs": "17.7.x"
       },
       "bin": {
@@ -23,7 +23,6 @@
         "fs-extra": "11.4.x",
         "globals": "17.11.x",
         "mocha": "11.8.x",
-        "must": "0.13.x",
         "nyc": "18.0.x",
         "prettier": "3.9.x",
         "sinon": "22.1.x",
@@ -457,6 +456,7 @@
       "version": "1.11.3",
       "resolved": "https://registry.npmjs.org/@emnapi/runtime/-/runtime-1.11.3.tgz",
       "integrity": "sha512-Xz4Tpyki7XyrpbUK1jR1AhdAdaXyhhY4lZ3neLodmhpuWfy2PAQN5B46sAiU4liOXGLkHypn/qU+jvfWSCYYLA==",
+      "license": "MIT",
       "optional": true,
       "dependencies": {
         "tslib": "^2.4.0"
@@ -706,12 +706,13 @@
       }
     },
     "node_modules/@img/sharp-darwin-arm64": {
-      "version": "0.35.3",
-      "resolved": "https://registry.npmjs.org/@img/sharp-darwin-arm64/-/sharp-darwin-arm64-0.35.3.tgz",
-      "integrity": "sha512-RMnFX7YQsMoh7lWfcM4NEHHymBX/rLuKNPVM84XE9ONPcaSCDgE7CHIHpSgPcO2xcRthgBy1HfNO319mwhIAkg==",
+      "version": "0.35.4",
+      "resolved": "https://registry.npmjs.org/@img/sharp-darwin-arm64/-/sharp-darwin-arm64-0.35.4.tgz",
+      "integrity": "sha512-Uhfl4V4lhP2nbUVF9+hyH1+luj86f1gUFeo8ALYxFoULoU+G87D43BfeMP8XHsk9boxAnCY/bf2EHwhA7MuGsA==",
       "cpu": [
         "arm64"
       ],
+      "license": "Apache-2.0",
       "optional": true,
       "os": [
         "darwin"
@@ -723,16 +724,17 @@
         "url": "https://opencollective.com/libvips"
       },
       "optionalDependencies": {
-        "@img/sharp-libvips-darwin-arm64": "1.3.2"
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@@ -826,12 +833,13 @@
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@@ -841,12 +849,13 @@
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@@ -856,12 +865,13 @@
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@@ -886,12 +897,13 @@
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@@ -901,12 +913,13 @@
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@@ -916,12 +929,13 @@
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@@ -933,16 +947,17 @@
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@@ -954,16 +969,17 @@
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@@ -975,16 +991,17 @@
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@@ -996,16 +1013,17 @@
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@@ -1017,16 +1035,17 @@
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@@ -1038,16 +1057,17 @@
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@@ -1059,16 +1079,17 @@
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@@ -1153,12 +1178,13 @@
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@@ -3378,12 +3346,6 @@
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@@ -3595,15 +3557,6 @@
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@@ -3671,26 +3624,6 @@
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-      "dev": true,
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/feross"
-        },
-        {
-          "type": "patreon",
-          "url": "https://www.patreon.com/feross"
-        },
-        {
-          "type": "consulting",
-          "url": "https://feross.org/support"
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@@ -3701,12 +3634,12 @@
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+      "version": "7.1.1",
+      "resolved": "https://registry.npmjs.org/serialize-javascript/-/serialize-javascript-7.1.1.tgz",
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       "dev": true,
-      "dependencies": {
-        "randombytes": "^2.1.0"
+      "engines": {
+        "node": ">=20.0.0"
       }
     },
     "node_modules/set-blocking": {
@@ -3716,9 +3649,10 @@
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-      "resolved": "https://registry.npmjs.org/sharp/-/sharp-0.35.3.tgz",
-      "integrity": "sha512-ej0zVHuZGHCiABXcNxeYhpRnPNPAcvbG8RMdBAhDAxLKkCRVSpK3Iyu7qbqw3JMzoj0REeM6f3tJLtVwl0023Q==",
+      "version": "0.35.4",
+      "resolved": "https://registry.npmjs.org/sharp/-/sharp-0.35.4.tgz",
+      "integrity": "sha512-n++8XWcj+jCOr2IOl7h8LbKnGBDY4aPbmprMONBNFdn0ImXqpGVv5zliDs0V9HbmbCQLpbuo2ej9rAoOQTvMDA==",
+      "license": "Apache-2.0",
       "dependencies": {
         "@img/colour": "^1.1.0",
         "detect-libc": "^2.1.2",
@@ -3731,31 +3665,31 @@
         "url": "https://opencollective.com/libvips"
       },
       "optionalDependencies": {
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-        "@img/sharp-darwin-x64": "0.35.3",
-        "@img/sharp-freebsd-wasm32": "0.35.3",
-        "@img/sharp-libvips-darwin-arm64": "1.3.2",
-        "@img/sharp-libvips-darwin-x64": "1.3.2",
-        "@img/sharp-libvips-linux-arm": "1.3.2",
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-        "@img/sharp-libvips-linux-ppc64": "1.3.2",
-        "@img/sharp-libvips-linux-riscv64": "1.3.2",
-        "@img/sharp-libvips-linux-s390x": "1.3.2",
-        "@img/sharp-libvips-linux-x64": "1.3.2",
-        "@img/sharp-libvips-linuxmusl-arm64": "1.3.2",
-        "@img/sharp-libvips-linuxmusl-x64": "1.3.2",
-        "@img/sharp-linux-arm": "0.35.3",
-        "@img/sharp-linux-arm64": "0.35.3",
-        "@img/sharp-linux-ppc64": "0.35.3",
-        "@img/sharp-linux-riscv64": "0.35.3",
-        "@img/sharp-linux-s390x": "0.35.3",
-        "@img/sharp-linux-x64": "0.35.3",
-        "@img/sharp-linuxmusl-arm64": "0.35.3",
-        "@img/sharp-linuxmusl-x64": "0.35.3",
-        "@img/sharp-webcontainers-wasm32": "0.35.3",
-        "@img/sharp-win32-arm64": "0.35.3",
-        "@img/sharp-win32-ia32": "0.35.3",
-        "@img/sharp-win32-x64": "0.35.3"
+        "@img/sharp-darwin-arm64": "0.35.4",
+        "@img/sharp-darwin-x64": "0.35.4",
+        "@img/sharp-freebsd-wasm32": "0.35.4",
+        "@img/sharp-libvips-darwin-arm64": "1.3.3",
+        "@img/sharp-libvips-darwin-x64": "1.3.3",
+        "@img/sharp-libvips-linux-arm": "1.3.3",
+        "@img/sharp-libvips-linux-arm64": "1.3.3",
+        "@img/sharp-libvips-linux-ppc64": "1.3.3",
+        "@img/sharp-libvips-linux-riscv64": "1.3.3",
+        "@img/sharp-libvips-linux-s390x": "1.3.3",
+        "@img/sharp-libvips-linux-x64": "1.3.3",
+        "@img/sharp-libvips-linuxmusl-arm64": "1.3.3",
+        "@img/sharp-libvips-linuxmusl-x64": "1.3.3",
+        "@img/sharp-linux-arm": "0.35.4",
+        "@img/sharp-linux-arm64": "0.35.4",
+        "@img/sharp-linux-ppc64": "0.35.4",
+        "@img/sharp-linux-riscv64": "0.35.4",
+        "@img/sharp-linux-s390x": "0.35.4",
+        "@img/sharp-linux-x64": "0.35.4",
+        "@img/sharp-linuxmusl-arm64": "0.35.4",
+        "@img/sharp-linuxmusl-x64": "0.35.4",
+        "@img/sharp-webcontainers-wasm32": "0.35.4",
+        "@img/sharp-win32-arm64": "0.35.4",
+        "@img/sharp-win32-ia32": "0.35.4",
+        "@img/sharp-win32-x64": "0.35.4"
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       "peerDependenciesMeta": {
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@@ -4047,6 +3981,7 @@
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+      "license": "0BSD",
       "optional": true
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     "node_modules/type-check": {
diff --git a/package.json b/package.json
index 86982fe..56795ce 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sharp-cli",
-  "version": "6.0.0-dev",
+  "version": "6.1.0",
   "description": "CLI for sharp.",
   "keywords": [
     "cli",
@@ -16,7 +16,10 @@
   "license": "MIT",
   "type": "module",
   "author": "Mark van Seventer <mark@vseventer.com>",
-  "repository": "vseventer/sharp-cli",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/vseventer/sharp-cli.git"
+  },
   "bin": {
     "sharp": "bin/cli.js"
   },
@@ -30,7 +33,7 @@
   },
   "dependencies": {
     "glob": "13.0.x",
-    "sharp": "0.35.3",
+    "sharp": "0.35.4",
     "yargs": "17.7.x"
   },
   "devDependencies": {
@@ -40,12 +43,15 @@
     "fs-extra": "11.4.x",
     "globals": "17.11.x",
     "mocha": "11.8.x",
-    "must": "0.13.x",
     "nyc": "18.0.x",
     "prettier": "3.9.x",
     "sinon": "22.1.x",
     "tempy": "3.2.x"
   },
+  "overrides": {
+    "diff": "8.0.3",
+    "serialize-javascript": "7.1.1"
+  },
   "engines": {
     "node": ">=20.10.0"
   }
diff --git a/test/cli.js b/test/cli.js
index a09951d..ec9b096 100644
--- a/test/cli.js
+++ b/test/cli.js
@@ -22,10 +22,10 @@
  */
 
 // Standard lib.
+import assert from "node:assert/strict";
 import { fileURLToPath } from "node:url";
 
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -53,12 +53,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the adaptiveFiltering flag", () => {
-        expect(cli.parsed.argv).to.have.property("adaptiveFiltering", true);
+        assert.equal(cli.parsed.argv["adaptiveFiltering"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("png");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("png"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -77,12 +77,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the alphaQuality flag", () => {
-        expect(cli.parsed.argv).to.have.property("alphaQuality", alphaQuality);
+        assert.equal(cli.parsed.argv["alphaQuality"], alphaQuality);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("webp");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("webp"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -97,7 +97,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       it("must set the animated flag", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("animated", true);
+        assert.equal(args["animated"], true);
       });
       it("must set the animated flag when using composite", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -115,7 +115,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       it("must set the autoOrient flag", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("autoOrient", true);
+        assert.equal(args["autoOrient"], true);
       });
       it("must set the autoOrient flag when using composite", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -132,12 +132,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the bigtiff flag", () => {
-        expect(cli.parsed.argv).to.have.property("bigtiff", true);
+        assert.equal(cli.parsed.argv["bigtiff"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tiff");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tiff"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -154,12 +154,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the bitdepth flag", () => {
-        expect(cli.parsed.argv).to.have.property("bitdepth", bitdepth);
+        assert.equal(cli.parsed.argv["bitdepth"], bitdepth);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tiff");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tiff"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -178,16 +178,13 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the chromaSubsampling flag", () => {
-        expect(cli.parsed.argv).to.have.property(
-          "chromaSubsampling",
-          chromaSubsampling,
-        );
+        assert.equal(cli.parsed.argv["chromaSubsampling"], chromaSubsampling);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(2);
-        expect(pipeline).to.include("avif");
-        expect(pipeline).to.include("jpeg");
+        assert.equal(pipeline.length, 2);
+        assert.ok(pipeline.includes("avif"));
+        assert.ok(pipeline.includes("jpeg"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -205,13 +202,13 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
         // Tests.
         it("must set the colors flag", () => {
-          expect(cli.parsed.argv).to.have.property("colors", colors);
+          assert.equal(cli.parsed.argv["colors"], colors);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(2);
-          expect(pipeline).to.include("gif");
-          expect(pipeline).to.include("png");
+          assert.equal(pipeline.length, 2);
+          assert.ok(pipeline.includes("gif"));
+          assert.ok(pipeline.includes("png"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -229,12 +226,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the compression flag", () => {
-        expect(cli.parsed.argv).to.have.property("compression", compression);
+        assert.equal(cli.parsed.argv["compression"], compression);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tiff");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tiff"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -252,12 +249,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
         // Tests.
         it("must set the compressionLevel flag", () => {
-          expect(cli.parsed.argv).to.have.property("compressionLevel", level);
+          assert.equal(cli.parsed.argv["compressionLevel"], level);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("png");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("png"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -277,12 +274,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the delay flag", () => {
-        expect(cli.parsed.argv).to.have.property("delay", delay);
+        assert.equal(cli.parsed.argv["delay"], delay);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("gif");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("gif"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -299,7 +296,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the density flag", () => {
-        expect(cli.parsed.argv).to.have.property("density", density);
+        assert.equal(cli.parsed.argv["density"], density);
       });
     });
 
@@ -312,13 +309,13 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the dither flag", () => {
-        expect(cli.parsed.argv).to.have.property("dither", dither);
+        assert.equal(cli.parsed.argv["dither"], dither);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(2);
-        expect(pipeline).to.include("gif");
-        expect(pipeline).to.include("png");
+        assert.equal(pipeline.length, 2);
+        assert.ok(pipeline.includes("gif"));
+        assert.ok(pipeline.includes("png"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -333,7 +330,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the dry flag", () => {
-        expect(cli.parsed.argv).to.have.property("dry", true);
+        assert.equal(cli.parsed.argv["dry"], true);
       });
     });
 
@@ -346,16 +343,16 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the effort flag", () => {
-        expect(cli.parsed.argv).to.have.property("effort", effort);
+        assert.equal(cli.parsed.argv["effort"], effort);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(5);
-        expect(pipeline).to.include("avif");
-        expect(pipeline).to.include("gif");
-        expect(pipeline).to.include("heif");
-        expect(pipeline).to.include("png");
-        expect(pipeline).to.include("webp");
+        assert.equal(pipeline.length, 5);
+        assert.ok(pipeline.includes("avif"));
+        assert.ok(pipeline.includes("gif"));
+        assert.ok(pipeline.includes("heif"));
+        assert.ok(pipeline.includes("png"));
+        assert.ok(pipeline.includes("webp"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -369,12 +366,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the exact flag", () => {
-        expect(cli.parsed.argv).to.have.property("exact", true);
+        assert.equal(cli.parsed.argv["exact"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("webp");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("webp"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -392,7 +389,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       it("must set the failOn flag", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("failOn", failOn);
+        assert.equal(args["failOn"], failOn);
       });
       it("must set the failOn flag when using composite", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -413,12 +410,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
         // Tests.
         it("must set the format flag", () => {
-          expect(cli.parsed.argv).to.have.property("format", format);
+          assert.equal(cli.parsed.argv["format"], format);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("format");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("format"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -428,11 +425,11 @@ describe(`${pkg.name} <options> [command..]`, () => {
     });
     ["h", "help"].forEach((alias) => {
       describe(`--${alias}`, () => {
-        it("must display help", async () => {
-          const output = await cli
-            .parseAsync([`--${alias}`])
-            .catch((output) => output);
-          expect(output).to.contain("Commands");
+        it("must display help", () => {
+          return assert.rejects(cli.parseAsync([`--${alias}`]), (output) => {
+            assert.ok(output.includes("Commands"));
+            return true;
+          });
         });
       });
     });
@@ -446,12 +443,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the hbitdepth flag", () => {
-        expect(cli.parsed.argv).to.have.property("hbitdepth", bitdepth);
+        assert.equal(cli.parsed.argv["hbitdepth"], bitdepth);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("heif");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("heif"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -468,12 +465,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the compression flag", () => {
-        expect(cli.parsed.argv).to.have.property("hcompression", compression);
+        assert.equal(cli.parsed.argv["hcompression"], compression);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("heif");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("heif"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -490,18 +487,15 @@ describe(`${pkg.name} <options> [command..]`, () => {
         // Tests.
         it("must set the input flag", () => {
           const args = cli.parsed.argv;
-          expect(args).to.have.property("input");
-          expect(args.input).to.eql([input, input]);
+          assert.ok(Object.prototype.hasOwnProperty.call(args, "input"));
+          assert.deepEqual(args.input, [input, input]);
         });
 
-        it("must fail when no input is given", async () => {
-          const error = await cli
-            .parseAsync([`--${alias}`, "-o", output])
-            .then(() => {
-              throw new Error("STOP");
-            })
-            .catch((error) => error);
-          expect(error.message).to.contain("Not enough arguments");
+        it("must fail when no input is given", () => {
+          return assert.rejects(
+            cli.parseAsync([`--${alias}`, "-o", output]),
+            "Not enough arguments",
+          );
         });
       });
     });
@@ -513,7 +507,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the ignoreIcc flag", () => {
-        expect(cli.parsed.argv).to.have.property("ignoreIcc", true);
+        assert.equal(cli.parsed.argv["ignoreIcc"], true);
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -533,12 +527,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the interFrameMaxError flag", () => {
-        expect(cli.parsed.argv).to.have.property("interFrameMaxError", max);
+        assert.equal(cli.parsed.argv["interFrameMaxError"], max);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("gif");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("gif"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -555,12 +549,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the interPaletteMaxError flag", () => {
-        expect(cli.parsed.argv).to.have.property("interPaletteMaxError", max);
+        assert.equal(cli.parsed.argv["interPaletteMaxError"], max);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("gif");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("gif"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -576,12 +570,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the keepDuplicateFrames flag", () => {
-        expect(cli.parsed.argv).to.have.property("keepDuplicateFrames", true);
+        assert.equal(cli.parsed.argv["keepDuplicateFrames"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("gif");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("gif"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -597,12 +591,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the keepGainMap flag", () => {
-        expect(cli.parsed.argv).to.have.property("keepGainMap", true);
+        assert.equal(cli.parsed.argv["keepGainMap"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("keepGainMap");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("keepGainMap"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -619,7 +613,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the level flag", () => {
-        expect(cli.parsed.argv).to.have.property("level", level);
+        assert.equal(cli.parsed.argv["level"], level);
       });
     });
 
@@ -639,7 +633,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       it("must set the limitInputChannels flag", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("limitInputChannels", value);
+        assert.equal(args["limitInputChannels"], value);
       });
       it("must set the limitInputChannels flag when using composite", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -666,7 +660,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       it("must set the limitInputPixels flag", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("limitInputPixels", value);
+        assert.equal(args["limitInputPixels"], value);
       });
       it("must set the limitInputPixels flag when using composite", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -686,12 +680,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the loop flag", () => {
-        expect(cli.parsed.argv).to.have.property("loop", loop);
+        assert.equal(cli.parsed.argv["loop"], loop);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("gif");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("gif"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -705,14 +699,14 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the lossless flag", () => {
-        expect(cli.parsed.argv).to.have.property("lossless", true);
+        assert.equal(cli.parsed.argv["lossless"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(3);
-        expect(pipeline).to.include("avif");
-        expect(pipeline).to.include("heif");
-        expect(pipeline).to.include("webp");
+        assert.equal(pipeline.length, 3);
+        assert.ok(pipeline.includes("avif"));
+        assert.ok(pipeline.includes("heif"));
+        assert.ok(pipeline.includes("webp"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -727,12 +721,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the miniswhite flag", () => {
-        expect(cli.parsed.argv).to.have.property("miniswhite", true);
+        assert.equal(cli.parsed.argv["miniswhite"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tiff");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tiff"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -746,12 +740,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the minSize flag", () => {
-        expect(cli.parsed.argv).to.have.property("minSize", true);
+        assert.equal(cli.parsed.argv["minSize"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("webp");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("webp"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -765,12 +759,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the lossless flag", () => {
-        expect(cli.parsed.argv).to.have.property("mixed", true);
+        assert.equal(cli.parsed.argv["mixed"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("webp");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("webp"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -784,12 +778,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the mozjpeg flag", () => {
-        expect(cli.parsed.argv).to.have.property("mozjpeg", true);
+        assert.equal(cli.parsed.argv["mozjpeg"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("jpeg");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("jpeg"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -803,12 +797,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the nearLossless flag", () => {
-        expect(cli.parsed.argv).to.have.property("nearLossless", true);
+        assert.equal(cli.parsed.argv["nearLossless"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("webp");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("webp"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -822,12 +816,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
         // Tests.
         it("must set the optimise flag", () => {
-          expect(cli.parsed.argv).to.have.property("optimise", true);
+          assert.equal(cli.parsed.argv["optimise"], true);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("jpeg");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("jpeg"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -846,12 +840,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
         // Tests.
         it("must set the optimiseScans flag", () => {
-          expect(cli.parsed.argv).to.have.property("optimiseCoding", false);
+          assert.equal(cli.parsed.argv["optimiseCoding"], false);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("jpeg");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("jpeg"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -868,14 +862,14 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
         // Tests.
         it("must set the optimiseScans flag", () => {
-          expect(cli.parsed.argv).to.have.property("optimiseScans", true);
+          assert.equal(cli.parsed.argv["optimiseScans"], true);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(3);
-          expect(pipeline).to.include("jpeg");
-          expect(pipeline).to.include("gif"); // Because: -p.
-          expect(pipeline).to.include("png"); // Because: -p.
+          assert.equal(pipeline.length, 3);
+          assert.ok(pipeline.includes("jpeg"));
+          assert.ok(pipeline.includes("gif")); // Because: -p.
+          assert.ok(pipeline.includes("png")); // Because: -p.
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -890,7 +884,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
         // Tests.
         it("must set the output flag", () => {
-          expect(cli.parsed.argv).to.have.property("output", output);
+          assert.equal(cli.parsed.argv["output"], output);
         });
       });
     });
@@ -901,12 +895,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the overshootDeringing flag", () => {
-        expect(cli.parsed.argv).to.have.property("overshootDeringing", true);
+        assert.equal(cli.parsed.argv["overshootDeringing"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("jpeg");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("jpeg"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -925,7 +919,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the page flag", () => {
-        expect(cli.parsed.argv).to.have.property("page", page);
+        assert.equal(cli.parsed.argv["page"], page);
       });
     });
 
@@ -938,7 +932,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the pages flag", () => {
-        expect(cli.parsed.argv).to.have.property("pages", pages);
+        assert.equal(cli.parsed.argv["pages"], pages);
       });
     });
 
@@ -948,12 +942,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the palette flag", () => {
-        expect(cli.parsed.argv).to.have.property("palette", true);
+        assert.equal(cli.parsed.argv["palette"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("png");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("png"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -977,7 +971,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       it("must set the pdfBackground flag", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("pdfBackground", value);
+        assert.equal(args["pdfBackground"], value);
       });
       it("must set the pdfBackground flag when using composite", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -997,12 +991,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the predictor flag", () => {
-        expect(cli.parsed.argv).to.have.property("predictor", predictor);
+        assert.equal(cli.parsed.argv["predictor"], predictor);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tiff");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tiff"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1019,12 +1013,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the preset flag", () => {
-        expect(cli.parsed.argv).to.have.property("preset", preset);
+        assert.equal(cli.parsed.argv["preset"], preset);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("webp");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("webp"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1038,7 +1032,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the print flag", () => {
-        expect(cli.parsed.argv).to.have.property("print", true);
+        assert.equal(cli.parsed.argv["print"], true);
       });
     });
 
@@ -1048,12 +1042,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the pyramid flag", () => {
-        expect(cli.parsed.argv).to.have.property("pyramid", true);
+        assert.equal(cli.parsed.argv["pyramid"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tiff");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tiff"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1068,14 +1062,14 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
         // Tests.
         it("must set the format flag", () => {
-          expect(cli.parsed.argv).to.have.property("progressive", true);
+          assert.equal(cli.parsed.argv["progressive"], true);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(3);
-          expect(pipeline).to.include("gif");
-          expect(pipeline).to.include("jpeg");
-          expect(pipeline).to.include("png");
+          assert.equal(pipeline.length, 3);
+          assert.ok(pipeline.includes("gif"));
+          assert.ok(pipeline.includes("jpeg"));
+          assert.ok(pipeline.includes("png"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -1096,16 +1090,16 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
         // Tests.
         it("must set the format flag", () => {
-          expect(cli.parsed.argv).to.have.property("quality", quality);
+          assert.equal(cli.parsed.argv["quality"], quality);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(5);
-          expect(pipeline).to.include("avif");
-          expect(pipeline).to.include("heif");
-          expect(pipeline).to.include("jpeg");
-          expect(pipeline).to.include("tiff");
-          expect(pipeline).to.include("webp");
+          assert.equal(pipeline.length, 5);
+          assert.ok(pipeline.includes("avif"));
+          assert.ok(pipeline.includes("heif"));
+          assert.ok(pipeline.includes("jpeg"));
+          assert.ok(pipeline.includes("tiff"));
+          assert.ok(pipeline.includes("webp"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -1143,12 +1137,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
         // Tests.
         it("must set the quantisationTable flag", () => {
-          expect(cli.parsed.argv).to.have.property("quantisationTable", table);
+          assert.equal(cli.parsed.argv["quantisationTable"], table);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("jpeg");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("jpeg"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -1165,12 +1159,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
         // Tests.
         it("must set the reoptimise flag", () => {
-          expect(cli.parsed.argv).to.have.property("reuse", true);
+          assert.equal(cli.parsed.argv["reuse"], true);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("gif");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("gif"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -1188,12 +1182,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the resolutionUnit flag", () => {
-        expect(cli.parsed.argv).to.have.property("resolutionUnit", unit);
+        assert.equal(cli.parsed.argv["resolutionUnit"], unit);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tiff");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tiff"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1207,12 +1201,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the smartDeblock flag", () => {
-        expect(cli.parsed.argv).to.have.property("smartDeblock", true);
+        assert.equal(cli.parsed.argv["smartDeblock"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("webp");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("webp"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1226,12 +1220,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the smartSubsample flag", () => {
-        expect(cli.parsed.argv).to.have.property("smartSubsample", true);
+        assert.equal(cli.parsed.argv["smartSubsample"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("webp");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("webp"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1248,7 +1242,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the subifd flag", () => {
-        expect(cli.parsed.argv).to.have.property("subifd", subifd);
+        assert.equal(cli.parsed.argv["subifd"], subifd);
       });
     });
 
@@ -1263,15 +1257,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the tileBackground flag", () => {
-        expect(cli.parsed.argv).to.have.property(
-          "tileBackground",
-          tileBackground,
-        );
+        assert.equal(cli.parsed.argv["tileBackground"], tileBackground);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tiff");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tiff"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1290,12 +1281,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the tileHeight flag", () => {
-        expect(cli.parsed.argv).to.have.property("tileHeight", tileHeight);
+        assert.equal(cli.parsed.argv["tileHeight"], tileHeight);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tiff");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tiff"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1325,12 +1316,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the tileWidth flag", () => {
-        expect(cli.parsed.argv).to.have.property("tileWidth", tileWidth);
+        assert.equal(cli.parsed.argv["tileWidth"], tileWidth);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tiff");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tiff"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1348,12 +1339,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the trellisQuantisation flag", () => {
-        expect(cli.parsed.argv).to.have.property("trellisQuantisation", true);
+        assert.equal(cli.parsed.argv["trellisQuantisation"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("jpeg");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("jpeg"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1364,11 +1355,11 @@ describe(`${pkg.name} <options> [command..]`, () => {
     });
     ["v", "version"].forEach((alias) => {
       describe(`--${alias}`, () => {
-        it("must display the version number", async () => {
-          const output = await cli
-            .parseAsync([`--${alias}`])
-            .catch((output) => output);
-          expect(output).to.equal(pkg.version);
+        it("must display the version number", () => {
+          return assert.rejects(cli.parseAsync([`--${alias}`]), (output) => {
+            assert.equal(output, pkg.version);
+            return true;
+          });
         });
       });
     });
@@ -1382,12 +1373,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the timeout flag", () => {
-        expect(cli.parsed.argv).to.have.property("timeout", timeout);
+        assert.equal(cli.parsed.argv["timeout"], timeout);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("timeout");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("timeout"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1404,13 +1395,13 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the tune flag", () => {
-        expect(cli.parsed.argv).to.have.property("tune", tune);
+        assert.equal(cli.parsed.argv["tune"], tune);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(2);
-        expect(pipeline).to.include("avif");
-        expect(pipeline).to.include("heif");
+        assert.equal(pipeline.length, 2);
+        assert.ok(pipeline.includes("avif"));
+        assert.ok(pipeline.includes("heif"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1425,7 +1416,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the unlimited flag", () => {
-        expect(cli.parsed.argv).to.have.property("unlimited", true);
+        assert.equal(cli.parsed.argv["unlimited"], true);
       });
     });
 
@@ -1436,12 +1427,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
         // Tests.
         it("must set the withMetadata flag", () => {
-          expect(cli.parsed.argv).to.have.property("withMetadata", true);
+          assert.equal(cli.parsed.argv["withMetadata"], true);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("withMetadata");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("withMetadata"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -1459,12 +1450,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the withDensity flag", () => {
-        expect(cli.parsed.argv).to.have.property("withDensity", density);
+        assert.equal(cli.parsed.argv["withDensity"], density);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("withDensity");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("withDensity"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1478,12 +1469,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the withGainMap flag", () => {
-        expect(cli.parsed.argv).to.have.property("withGainMap", true);
+        assert.equal(cli.parsed.argv["withGainMap"], true);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("withGainMap");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("withGainMap"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1500,12 +1491,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the xres flag", () => {
-        expect(cli.parsed.argv).to.have.property("xres", xRes);
+        assert.equal(cli.parsed.argv["xres"], xRes);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tiff");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tiff"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1522,12 +1513,12 @@ describe(`${pkg.name} <options> [command..]`, () => {
 
       // Tests.
       it("must set the yres flag", () => {
-        expect(cli.parsed.argv).to.have.property("yres", yRes);
+        assert.equal(cli.parsed.argv["yres"], yRes);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tiff");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tiff"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -1543,8 +1534,8 @@ describe(`${pkg.name} <options> [command..]`, () => {
     // Tests.
     it("must update the pipeline", () => {
       const pipeline = getPipeline(cli.parsed.argv);
-      expect(pipeline).to.have.length(1);
-      expect(pipeline).to.include("flip");
+      assert.equal(pipeline.length, 1);
+      assert.ok(pipeline.includes("flip"));
     });
     it("must execute the pipeline", () => {
       const pipeline = drain(cli.parsed.argv);
@@ -1562,7 +1553,7 @@ describe(`${pkg.name} <options> [command..]`, () => {
         "--format",
         "jpeg",
       ]);
-      expect(getPipeline(cli.parsed.argv)).to.eql([
+      assert.deepEqual(getPipeline(cli.parsed.argv), [
         "format",
         "rotate",
         "resize",
@@ -1582,8 +1573,8 @@ describe(`${pkg.name} <options> [command..]`, () => {
         "--format",
         "webp",
       ]);
-      expect(argv.format).to.equal("webp");
-      expect(getPipeline(argv)).to.eql(["format", "rotate", "resize"]);
+      assert.equal(argv.format, "webp");
+      assert.deepEqual(getPipeline(argv), ["format", "rotate", "resize"]);
     });
 
     it("must apply format-specific options only to the selected format", async () => {
diff --git a/test/cmd/channel-manipulation/bandbool.js b/test/cmd/channel-manipulation/bandbool.js
index edf0e42..c6dfc7e 100644
--- a/test/cmd/channel-manipulation/bandbool.js
+++ b/test/cmd/channel-manipulation/bandbool.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-channel#bandbool
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -45,12 +47,12 @@ export default function register() {
 
     // Tests.
     it("must set the operator flag", () => {
-      expect(cli.parsed.argv).to.have.property("operator", "and");
+      assert.equal(cli.parsed.argv["operator"], "and");
     });
     it("must update the pipeline", () => {
       const pipeline = getPipeline(cli.parsed.argv);
-      expect(pipeline).to.have.length(1);
-      expect(pipeline).to.include("bandbool");
+      assert.equal(pipeline.length, 1);
+      assert.ok(pipeline.includes("bandbool"));
     });
     it("must execute the pipeline", () => {
       const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/channel-manipulation/ensure-alpha.js b/test/cmd/channel-manipulation/ensure-alpha.js
index c055fae..a8a84a1 100644
--- a/test/cmd/channel-manipulation/ensure-alpha.js
+++ b/test/cmd/channel-manipulation/ensure-alpha.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-channel#ensurealpha
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -47,8 +49,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("ensureAlpha");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("ensureAlpha"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -66,12 +68,12 @@ export default function register() {
 
         // Tests.
         it("must set the alpha flag", () => {
-          expect(cli.parsed.argv).to.have.property("alpha", alpha);
+          assert.equal(cli.parsed.argv["alpha"], alpha);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("ensureAlpha");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("ensureAlpha"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/channel-manipulation/extract-channel.js b/test/cmd/channel-manipulation/extract-channel.js
index 56a2bdf..d1d8a54 100644
--- a/test/cmd/channel-manipulation/extract-channel.js
+++ b/test/cmd/channel-manipulation/extract-channel.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-channel#extractchannel
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -45,12 +47,12 @@ export default function register() {
 
     // Tests.
     it("must set the operator flag", () => {
-      expect(cli.parsed.argv).to.have.property("channel", "red");
+      assert.equal(cli.parsed.argv["channel"], "red");
     });
     it("must update the pipeline", () => {
       const pipeline = getPipeline(cli.parsed.argv);
-      expect(pipeline).to.have.length(1);
-      expect(pipeline).to.include("extractChannel");
+      assert.equal(pipeline.length, 1);
+      assert.ok(pipeline.includes("extractChannel"));
     });
     it("must execute the pipeline", () => {
       const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/channel-manipulation/join-channel.js b/test/cmd/channel-manipulation/join-channel.js
index 9f3aec7..d7c68b6 100644
--- a/test/cmd/channel-manipulation/join-channel.js
+++ b/test/cmd/channel-manipulation/join-channel.js
@@ -24,11 +24,11 @@
 // @see https://sharp.pixelplumbing.com/api-channel#bandbool
 
 // Standard lib.
+import assert from "node:assert/strict";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -56,16 +56,16 @@ export default function register() {
       // Tests.
       it("must set the operator flag", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("images");
-        expect(args.images).to.eql([
+        assert.ok(Object.prototype.hasOwnProperty.call(args, "images"));
+        assert.deepEqual(args.images, [
           path.normalize(input),
           path.normalize(input),
         ]);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("joinChannel");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("joinChannel"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/channel-manipulation/remove-alpha.js b/test/cmd/channel-manipulation/remove-alpha.js
index 71e5d35..da852ab 100644
--- a/test/cmd/channel-manipulation/remove-alpha.js
+++ b/test/cmd/channel-manipulation/remove-alpha.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-channel#removealpha
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -46,8 +48,8 @@ export default function register() {
     // Tests.
     it("must update the pipeline", () => {
       const pipeline = getPipeline(cli.parsed.argv);
-      expect(pipeline).to.have.length(1);
-      expect(pipeline).to.include("removeAlpha");
+      assert.equal(pipeline.length, 1);
+      assert.ok(pipeline.includes("removeAlpha"));
     });
     it("must execute the pipeline", () => {
       const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/colour-manipulation/greyscale.js b/test/cmd/colour-manipulation/greyscale.js
index e251f9c..948fe44 100644
--- a/test/cmd/colour-manipulation/greyscale.js
+++ b/test/cmd/colour-manipulation/greyscale.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-channel#greyscale
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -47,8 +49,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("greyscale");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("greyscale"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/colour-manipulation/pipeline-colourspace.js b/test/cmd/colour-manipulation/pipeline-colourspace.js
index 8543087..0b03f34 100644
--- a/test/cmd/colour-manipulation/pipeline-colourspace.js
+++ b/test/cmd/colour-manipulation/pipeline-colourspace.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-colour#pipelinecolorspace
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -46,12 +48,12 @@ export default function register() {
 
       // Tests.
       it("must set the colourspace flag", () => {
-        expect(cli.parsed.argv).to.have.property("colourspace", "srgb");
+        assert.equal(cli.parsed.argv["colourspace"], "srgb");
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("pipelineColourspace");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("pipelineColourspace"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/colour-manipulation/tint.js b/test/cmd/colour-manipulation/tint.js
index dc9a38e..1683392 100644
--- a/test/cmd/colour-manipulation/tint.js
+++ b/test/cmd/colour-manipulation/tint.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-colour#tint
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -48,12 +50,12 @@ export default function register() {
 
     // Tests.
     it("must set the colourspace flag", () => {
-      expect(cli.parsed.argv).to.have.property("rgb", rgb);
+      assert.equal(cli.parsed.argv["rgb"], rgb);
     });
     it("must update the pipeline", () => {
       const pipeline = getPipeline(cli.parsed.argv);
-      expect(pipeline).to.have.length(1);
-      expect(pipeline).to.include("tint");
+      assert.equal(pipeline.length, 1);
+      assert.ok(pipeline.includes("tint"));
     });
     it("must execute the pipeline", () => {
       const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/colour-manipulation/tocolourspace.js b/test/cmd/colour-manipulation/tocolourspace.js
index 6e2fc0d..1fae7e0 100644
--- a/test/cmd/colour-manipulation/tocolourspace.js
+++ b/test/cmd/colour-manipulation/tocolourspace.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-channel#tocolourspace
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -46,12 +48,12 @@ export default function register() {
 
       // Tests.
       it("must set the colourspace flag", () => {
-        expect(cli.parsed.argv).to.have.property("colourspace", "srgb");
+        assert.equal(cli.parsed.argv["colourspace"], "srgb");
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("toColourspace");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("toColourspace"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/compositing/composite.js b/test/cmd/compositing/composite.js
index a9c2b25..b83d245 100644
--- a/test/cmd/compositing/composite.js
+++ b/test/cmd/compositing/composite.js
@@ -24,11 +24,11 @@
 // @see http://sharp.pixelplumbing.com/api-composite#composite
 
 // Standard lib.
+import assert from "node:assert/strict";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -55,13 +55,15 @@ export default function register() {
 
       // Tests.
       it("must set the images flag", () => {
-        expect(cli.parsed.argv).to.have.property("images");
-        expect(cli.parsed.argv.images[0]).to.equal(path.normalize(input));
+        assert.ok(
+          Object.prototype.hasOwnProperty.call(cli.parsed.argv, "images"),
+        );
+        assert.equal(cli.parsed.argv.images[0], path.normalize(input));
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("composite");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("composite"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -160,12 +162,12 @@ export default function register() {
         before(() => cli.parseAsync(["composite", input, "--blend", blend]));
 
         it("must set the blend flag", () => {
-          expect(cli.parsed.argv).to.have.property("blend", blend);
+          assert.equal(cli.parsed.argv["blend"], blend);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("composite");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("composite"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -200,13 +202,13 @@ export default function register() {
         describe("--create.width", () => {
           it("must set the create.width flag", () => {
             const args = cli.parsed.argv;
-            expect(args).to.have.property("create");
-            expect(args.create).to.have.property("width", width);
+            assert.ok(Object.prototype.hasOwnProperty.call(args, "create"));
+            assert.equal(args.create["width"], width);
           });
           it("must update the pipeline", () => {
             const pipeline = getPipeline(cli.parsed.argv);
-            expect(pipeline).to.have.length(1);
-            expect(pipeline).to.include("composite");
+            assert.equal(pipeline.length, 1);
+            assert.ok(pipeline.includes("composite"));
           });
           it("must execute the pipeline", () => {
             const pipeline = drain(cli.parsed.argv);
@@ -220,13 +222,13 @@ export default function register() {
         describe("--create.height", () => {
           it("must set the create.height flag", () => {
             const args = cli.parsed.argv;
-            expect(args).to.have.property("create");
-            expect(args.create).to.have.property("height", height);
+            assert.ok(Object.prototype.hasOwnProperty.call(args, "create"));
+            assert.equal(args.create["height"], height);
           });
           it("must update the pipeline", () => {
             const pipeline = getPipeline(cli.parsed.argv);
-            expect(pipeline).to.have.length(1);
-            expect(pipeline).to.include("composite");
+            assert.equal(pipeline.length, 1);
+            assert.ok(pipeline.includes("composite"));
           });
           it("must execute the pipeline", () => {
             const pipeline = drain(cli.parsed.argv);
@@ -240,13 +242,13 @@ export default function register() {
         describe("--create.channels", () => {
           it("must set the create.channels flag", () => {
             const args = cli.parsed.argv;
-            expect(args).to.have.property("create");
-            expect(args.create).to.have.property("channels", channels);
+            assert.ok(Object.prototype.hasOwnProperty.call(args, "create"));
+            assert.equal(args.create["channels"], channels);
           });
           it("must update the pipeline", () => {
             const pipeline = getPipeline(cli.parsed.argv);
-            expect(pipeline).to.have.length(1);
-            expect(pipeline).to.include("composite");
+            assert.equal(pipeline.length, 1);
+            assert.ok(pipeline.includes("composite"));
           });
           it("must execute the pipeline", () => {
             const pipeline = drain(cli.parsed.argv);
@@ -260,13 +262,13 @@ export default function register() {
         describe("--create.background", () => {
           it("must set the create.background flag", () => {
             const args = cli.parsed.argv;
-            expect(args).to.have.property("create");
-            expect(args.create).to.have.property("background", background);
+            assert.ok(Object.prototype.hasOwnProperty.call(args, "create"));
+            assert.equal(args.create["background"], background);
           });
           it("must update the pipeline", () => {
             const pipeline = getPipeline(cli.parsed.argv);
-            expect(pipeline).to.have.length(1);
-            expect(pipeline).to.include("composite");
+            assert.equal(pipeline.length, 1);
+            assert.ok(pipeline.includes("composite"));
           });
           it("must execute the pipeline", () => {
             const pipeline = drain(cli.parsed.argv);
@@ -287,12 +289,12 @@ export default function register() {
         );
 
         it("must set the density flag", () => {
-          expect(cli.parsed.argv).to.have.property("density", density);
+          assert.equal(cli.parsed.argv["density"], density);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("composite");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("composite"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -309,12 +311,12 @@ export default function register() {
         );
 
         it("must set the gravity flag", () => {
-          expect(cli.parsed.argv).to.have.property("gravity", "centre");
+          assert.equal(cli.parsed.argv["gravity"], "centre");
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("composite");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("composite"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -335,12 +337,12 @@ export default function register() {
 
         it("must set the left flag", () => {
           const args = cli.parsed.argv;
-          expect(args).to.have.property("left", left);
+          assert.equal(args["left"], left);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("composite");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("composite"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -355,12 +357,12 @@ export default function register() {
         before(() => cli.parseAsync(["composite", input, "--premultiplied"]));
 
         it("must set the premultiplied flag", () => {
-          expect(cli.parsed.argv).to.have.property("premultiplied", true);
+          assert.equal(cli.parsed.argv["premultiplied"], true);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("composite");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("composite"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -375,12 +377,12 @@ export default function register() {
         before(() => cli.parseAsync(["composite", input, "--tile"]));
 
         it("must set the tile flag", () => {
-          expect(cli.parsed.argv).to.have.property("tile", true);
+          assert.equal(cli.parsed.argv["tile"], true);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("composite");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("composite"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -401,12 +403,12 @@ export default function register() {
 
         it("must set the top flag", () => {
           const args = cli.parsed.argv;
-          expect(args).to.have.property("top", top);
+          assert.equal(args["top"], top);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("composite");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("composite"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/affine.js b/test/cmd/operations/affine.js
index 2f7fab8..6cc447c 100644
--- a/test/cmd/operations/affine.js
+++ b/test/cmd/operations/affine.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#affine
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -49,13 +51,15 @@ export default function register() {
 
       // Tests.
       it("must set the matrix flag", () => {
-        expect(cli.parsed.argv).to.have.property("matrix");
-        expect(cli.parsed.argv.matrix).to.eql(matrix);
+        assert.ok(
+          Object.prototype.hasOwnProperty.call(cli.parsed.argv, "matrix"),
+        );
+        assert.deepEqual(cli.parsed.argv.matrix, matrix);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("affine");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("affine"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -78,12 +82,12 @@ export default function register() {
 
         // Tests.
         it("must set the background flag", () => {
-          expect(cli.parsed.argv).to.have.property("background", background);
+          assert.equal(cli.parsed.argv["background"], background);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("affine");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("affine"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -105,12 +109,12 @@ export default function register() {
 
           // Tests.
           it("must set the flat flag", () => {
-            expect(cli.parsed.argv).to.have.property(alias, value);
+            assert.equal(cli.parsed.argv[alias], value);
           });
           it("must update the pipeline", () => {
             const pipeline = getPipeline(cli.parsed.argv);
-            expect(pipeline).to.have.length(1);
-            expect(pipeline).to.include("affine");
+            assert.equal(pipeline.length, 1);
+            assert.ok(pipeline.includes("affine"));
           });
           it("must execute the pipeline", () => {
             const pipeline = drain(cli.parsed.argv);
@@ -132,12 +136,12 @@ export default function register() {
 
         // Tests.
         it("must set the background flag", () => {
-          expect(cli.parsed.argv).to.have.property("interpolate", interpolator);
+          assert.equal(cli.parsed.argv["interpolate"], interpolator);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("affine");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("affine"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/blur.js b/test/cmd/operations/blur.js
index 4409ea1..950e8bf 100644
--- a/test/cmd/operations/blur.js
+++ b/test/cmd/operations/blur.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#blur
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -51,8 +53,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("blur");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("blur"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -69,12 +71,12 @@ export default function register() {
 
       // Tests.
       it("must set the sigma flag", () => {
-        expect(cli.parsed.argv).to.have.property("sigma", sigma);
+        assert.equal(cli.parsed.argv["sigma"], sigma);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("blur");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("blur"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -97,12 +99,14 @@ export default function register() {
 
       // Tests.
       it("must set the minAmplitude flag", () => {
-        expect(cli.parsed.argv).to.have.property("minAmplitude");
+        assert.ok(
+          Object.prototype.hasOwnProperty.call(cli.parsed.argv, "minAmplitude"),
+        );
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("blur");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("blur"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -127,12 +131,14 @@ export default function register() {
 
       // Tests.
       it("must set the offset flag", () => {
-        expect(cli.parsed.argv).to.have.property("precision");
+        assert.ok(
+          Object.prototype.hasOwnProperty.call(cli.parsed.argv, "precision"),
+        );
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("blur");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("blur"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/boolean.js b/test/cmd/operations/boolean.js
index 39c4745..fcec56b 100644
--- a/test/cmd/operations/boolean.js
+++ b/test/cmd/operations/boolean.js
@@ -24,11 +24,11 @@
 // @see https://sharp.pixelplumbing.com/api-operation#boolean
 
 // Standard lib.
+import assert from "node:assert/strict";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -56,13 +56,13 @@ export default function register() {
       // Tests.
       it("must set the operand and operator flags", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("operand", path.normalize(input));
-        expect(args).to.have.property("operator", "and");
+        assert.equal(args["operand"], path.normalize(input));
+        assert.equal(args["operator"], "and");
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("boolean");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("boolean"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/clahe.js b/test/cmd/operations/clahe.js
index 22d0060..df0be5a 100644
--- a/test/cmd/operations/clahe.js
+++ b/test/cmd/operations/clahe.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#recomb
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -50,8 +52,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("clahe");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("clahe"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -71,12 +73,12 @@ export default function register() {
 
         // Tests.
         it("must set the maxSlope flag", () => {
-          expect(cli.parsed.argv).to.have.property("maxSlope", slope);
+          assert.equal(cli.parsed.argv["maxSlope"], slope);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("clahe");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("clahe"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/convolve.js b/test/cmd/operations/convolve.js
index 588ecfe..22ee2f0 100644
--- a/test/cmd/operations/convolve.js
+++ b/test/cmd/operations/convolve.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#convolve
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -52,15 +54,15 @@ export default function register() {
       // Tests.
       it("must set the width, height, and kernel flags", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("width", width);
-        expect(args).to.have.property("height", height);
-        expect(args).to.have.property("kernel");
-        expect(args.kernel).to.eql(kernel);
+        assert.equal(args["width"], width);
+        assert.equal(args["height"], height);
+        assert.ok(Object.prototype.hasOwnProperty.call(args, "kernel"));
+        assert.deepEqual(args.kernel, kernel);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("convolve");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("convolve"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -89,12 +91,12 @@ export default function register() {
         );
 
         it("must set the offset flag", () => {
-          expect(cli.parsed.argv).to.have.property("offset", offset);
+          assert.equal(cli.parsed.argv["offset"], offset);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("convolve");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("convolve"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -117,12 +119,12 @@ export default function register() {
         );
 
         it("must set the scale flag", () => {
-          expect(cli.parsed.argv).to.have.property("scale", scale);
+          assert.equal(cli.parsed.argv["scale"], scale);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("convolve");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("convolve"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/dilate.js b/test/cmd/operations/dilate.js
index b3b4b26..bee9b3d 100644
--- a/test/cmd/operations/dilate.js
+++ b/test/cmd/operations/dilate.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#dilate
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -45,8 +47,8 @@ export default function register() {
 
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("dilate");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("dilate"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -60,12 +62,12 @@ export default function register() {
       before(() => cli.parseAsync(["dilate", width]));
 
       it("must set the width flag", () => {
-        expect(cli.parsed.argv).to.have.property("width", width);
+        assert.equal(cli.parsed.argv["width"], width);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("dilate");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("dilate"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/erode.js b/test/cmd/operations/erode.js
index fdf0a41..c63d61e 100644
--- a/test/cmd/operations/erode.js
+++ b/test/cmd/operations/erode.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#erode
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -45,8 +47,8 @@ export default function register() {
 
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("erode");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("erode"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -60,12 +62,12 @@ export default function register() {
       before(() => cli.parseAsync(["erode", width]));
 
       it("must set the width flag", () => {
-        expect(cli.parsed.argv).to.have.property("width", width);
+        assert.equal(cli.parsed.argv["width"], width);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("erode");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("erode"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/flatten.js b/test/cmd/operations/flatten.js
index baec114..61aa3b3 100644
--- a/test/cmd/operations/flatten.js
+++ b/test/cmd/operations/flatten.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#flatten
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -47,8 +49,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("flatten");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("flatten"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -65,12 +67,12 @@ export default function register() {
 
       // Tests.
       it("must set the factor flag", () => {
-        expect(cli.parsed.argv).to.have.property("background", background);
+        assert.equal(cli.parsed.argv["background"], background);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("flatten");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("flatten"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/flip.js b/test/cmd/operations/flip.js
index bd433d2..209f58d 100644
--- a/test/cmd/operations/flip.js
+++ b/test/cmd/operations/flip.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#flip
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -46,8 +48,8 @@ export default function register() {
     // Tests.
     it("must update the pipeline", () => {
       const pipeline = getPipeline(cli.parsed.argv);
-      expect(pipeline).to.have.length(1);
-      expect(pipeline).to.include("flip");
+      assert.equal(pipeline.length, 1);
+      assert.ok(pipeline.includes("flip"));
     });
     it("must execute the pipeline", () => {
       const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/flop.js b/test/cmd/operations/flop.js
index e398d72..a471307 100644
--- a/test/cmd/operations/flop.js
+++ b/test/cmd/operations/flop.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#flop
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -46,8 +48,8 @@ export default function register() {
     // Tests.
     it("must update the pipeline", () => {
       const pipeline = getPipeline(cli.parsed.argv);
-      expect(pipeline).to.have.length(1);
-      expect(pipeline).to.include("flop");
+      assert.equal(pipeline.length, 1);
+      assert.ok(pipeline.includes("flop"));
     });
     it("must execute the pipeline", () => {
       const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/gamma.js b/test/cmd/operations/gamma.js
index 67a8948..6b75227 100644
--- a/test/cmd/operations/gamma.js
+++ b/test/cmd/operations/gamma.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#gamma
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -47,8 +49,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("gamma");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("gamma"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -65,12 +67,12 @@ export default function register() {
 
       // Tests.
       it("must set the gamma flag", () => {
-        expect(cli.parsed.argv).to.have.property("gamma", gamma);
+        assert.equal(cli.parsed.argv["gamma"], gamma);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("gamma");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("gamma"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -87,12 +89,12 @@ export default function register() {
 
       // Tests.
       it("must set the gammaOut flag", () => {
-        expect(cli.parsed.argv).to.have.property("gammaOut", gammaOut);
+        assert.equal(cli.parsed.argv["gammaOut"], gammaOut);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("gamma");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("gamma"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/linear.js b/test/cmd/operations/linear.js
index f03c898..025b19c 100644
--- a/test/cmd/operations/linear.js
+++ b/test/cmd/operations/linear.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#rotate
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -47,8 +49,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("linear");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("linear"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -65,13 +67,15 @@ export default function register() {
 
       // Tests.
       it("must set the multiplier flag", () => {
-        expect(cli.parsed.argv).to.have.property("multiplier");
-        expect(cli.parsed.argv.multiplier[0]).to.equal(multiplier);
+        assert.ok(
+          Object.prototype.hasOwnProperty.call(cli.parsed.argv, "multiplier"),
+        );
+        assert.equal(cli.parsed.argv.multiplier[0], multiplier);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("linear");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("linear"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -88,13 +92,15 @@ export default function register() {
 
       // Tests.
       it("must set the offset flag", () => {
-        expect(cli.parsed.argv).to.have.property("offset");
-        expect(cli.parsed.argv.offset[0]).to.equal(offset);
+        assert.ok(
+          Object.prototype.hasOwnProperty.call(cli.parsed.argv, "offset"),
+        );
+        assert.equal(cli.parsed.argv.offset[0], offset);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("linear");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("linear"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/median.js b/test/cmd/operations/median.js
index 5694e35..9a6d4ae 100644
--- a/test/cmd/operations/median.js
+++ b/test/cmd/operations/median.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#median
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -47,8 +49,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("median");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("median"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -65,12 +67,12 @@ export default function register() {
 
       // Tests.
       it("must set the size flag", () => {
-        expect(cli.parsed.argv).to.have.property("size", size);
+        assert.equal(cli.parsed.argv["size"], size);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("median");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("median"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/modulate.js b/test/cmd/operations/modulate.js
index 3d2057a..79014b8 100644
--- a/test/cmd/operations/modulate.js
+++ b/test/cmd/operations/modulate.js
@@ -23,8 +23,10 @@
 
 // @see http://sharp.pixelplumbing.com/api-operation#modulate
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -47,8 +49,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("modulate");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("modulate"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -65,12 +67,12 @@ export default function register() {
           before(() => cli.parseAsync(["modulate", `--${option}`, value]));
 
           it(`must set the ${option} flag`, () => {
-            expect(cli.parsed.argv).to.have.property(option, value);
+            assert.equal(cli.parsed.argv[option], value);
           });
           it("must update the pipeline", () => {
             const pipeline = getPipeline(cli.parsed.argv);
-            expect(pipeline).to.have.length(1);
-            expect(pipeline).to.include("modulate");
+            assert.equal(pipeline.length, 1);
+            assert.ok(pipeline.includes("modulate"));
           });
           it("must execute the pipeline", () => {
             const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/negate.js b/test/cmd/operations/negate.js
index 63b4e41..00324dc 100644
--- a/test/cmd/operations/negate.js
+++ b/test/cmd/operations/negate.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#negate
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -47,8 +49,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("negate");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("negate"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -63,12 +65,12 @@ export default function register() {
 
         // Tests.
         it("must set the alpha flag", () => {
-          expect(cli.parsed.argv).to.have.property("alpha", false);
+          assert.equal(cli.parsed.argv["alpha"], false);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("negate");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("negate"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/normalise.js b/test/cmd/operations/normalise.js
index 5fce9cb..07e3132 100644
--- a/test/cmd/operations/normalise.js
+++ b/test/cmd/operations/normalise.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#normalise
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -48,8 +50,8 @@ export default function register() {
         // Tests.
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("normalise");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("normalise"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -67,12 +69,12 @@ export default function register() {
 
           // Tests.
           it("must set the lower flag", () => {
-            expect(cli.parsed.argv).to.have.property("lower", lower);
+            assert.equal(cli.parsed.argv["lower"], lower);
           });
           it("must update the pipeline", () => {
             const pipeline = getPipeline(cli.parsed.argv);
-            expect(pipeline).to.have.length(1);
-            expect(pipeline).to.include("normalise");
+            assert.equal(pipeline.length, 1);
+            assert.ok(pipeline.includes("normalise"));
           });
           it("must execute the pipeline", () => {
             const pipeline = drain(cli.parsed.argv);
@@ -89,12 +91,12 @@ export default function register() {
 
           // Tests.
           it("must set the upper flag", () => {
-            expect(cli.parsed.argv).to.have.property("upper", upper);
+            assert.equal(cli.parsed.argv["upper"], upper);
           });
           it("must update the pipeline", () => {
             const pipeline = getPipeline(cli.parsed.argv);
-            expect(pipeline).to.have.length(1);
-            expect(pipeline).to.include("normalise");
+            assert.equal(pipeline.length, 1);
+            assert.ok(pipeline.includes("normalise"));
           });
           it("must execute the pipeline", () => {
             const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/recomb.js b/test/cmd/operations/recomb.js
index beb8008..c74ffda 100644
--- a/test/cmd/operations/recomb.js
+++ b/test/cmd/operations/recomb.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#recomb
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -51,13 +53,15 @@ export default function register() {
 
       // Tests.
       it("must set the matrix flag", () => {
-        expect(cli.parsed.argv).to.have.property("matrix");
-        expect(cli.parsed.argv.matrix).to.eql(matrix);
+        assert.ok(
+          Object.prototype.hasOwnProperty.call(cli.parsed.argv, "matrix"),
+        );
+        assert.deepEqual(cli.parsed.argv.matrix, matrix);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("recomb");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("recomb"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/rotate.js b/test/cmd/operations/rotate.js
index 10e20b2..ca0f3b6 100644
--- a/test/cmd/operations/rotate.js
+++ b/test/cmd/operations/rotate.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#rotate
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -47,8 +49,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("rotate");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("rotate"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -65,12 +67,12 @@ export default function register() {
 
       // Tests.
       it("must set the factor flag", () => {
-        expect(cli.parsed.argv).to.have.property("angle", angle);
+        assert.equal(cli.parsed.argv["angle"], angle);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("rotate");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("rotate"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -88,12 +90,12 @@ export default function register() {
 
         // Tests.
         it("must set the background flag", () => {
-          expect(cli.parsed.argv).to.have.property("background", background);
+          assert.equal(cli.parsed.argv["background"], background);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("rotate");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("rotate"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/sharpen.js b/test/cmd/operations/sharpen.js
index 1315b0e..f9161b4 100644
--- a/test/cmd/operations/sharpen.js
+++ b/test/cmd/operations/sharpen.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#sharpen
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -47,8 +49,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("sharpen");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("sharpen"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -65,12 +67,12 @@ export default function register() {
 
       // Tests.
       it("must set the sigma flag", () => {
-        expect(cli.parsed.argv).to.have.property("sigma", sigma);
+        assert.equal(cli.parsed.argv["sigma"], sigma);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("sharpen");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("sharpen"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -89,12 +91,12 @@ export default function register() {
 
           // Tests.
           it("must set the flat flag", () => {
-            expect(cli.parsed.argv).to.have.property("m1", flat);
+            assert.equal(cli.parsed.argv["m1"], flat);
           });
           it("must update the pipeline", () => {
             const pipeline = getPipeline(cli.parsed.argv);
-            expect(pipeline).to.have.length(1);
-            expect(pipeline).to.include("sharpen");
+            assert.equal(pipeline.length, 1);
+            assert.ok(pipeline.includes("sharpen"));
           });
           it("must execute the pipeline", () => {
             const pipeline = drain(cli.parsed.argv);
@@ -113,12 +115,12 @@ export default function register() {
 
           // Tests.
           it("must set the jagged flag", () => {
-            expect(cli.parsed.argv).to.have.property("jagged", jagged);
+            assert.equal(cli.parsed.argv["jagged"], jagged);
           });
           it("must update the pipeline", () => {
             const pipeline = getPipeline(cli.parsed.argv);
-            expect(pipeline).to.have.length(1);
-            expect(pipeline).to.include("sharpen");
+            assert.equal(pipeline.length, 1);
+            assert.ok(pipeline.includes("sharpen"));
           });
           it("must execute the pipeline", () => {
             const pipeline = drain(cli.parsed.argv);
@@ -137,12 +139,12 @@ export default function register() {
 
           // Tests.
           it("must set the flat flag", () => {
-            expect(cli.parsed.argv).to.have.property(alias, value);
+            assert.equal(cli.parsed.argv[alias], value);
           });
           it("must update the pipeline", () => {
             const pipeline = getPipeline(cli.parsed.argv);
-            expect(pipeline).to.have.length(1);
-            expect(pipeline).to.include("sharpen");
+            assert.equal(pipeline.length, 1);
+            assert.ok(pipeline.includes("sharpen"));
           });
           it("must execute the pipeline", () => {
             const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/threshold.js b/test/cmd/operations/threshold.js
index f2d577f..03cbeea 100644
--- a/test/cmd/operations/threshold.js
+++ b/test/cmd/operations/threshold.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#threshold
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -47,8 +49,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("threshold");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("threshold"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -65,12 +67,12 @@ export default function register() {
 
       // Tests.
       it("must set the factor flag", () => {
-        expect(cli.parsed.argv).to.have.property("value", value);
+        assert.equal(cli.parsed.argv["value"], value);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("threshold");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("threshold"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -84,12 +86,12 @@ export default function register() {
           before(() => cli.parseAsync(["threshold", `--${alias}`]));
 
           it("must set the greyscale flag", () => {
-            expect(cli.parsed.argv).to.have.property("greyscale", true);
+            assert.equal(cli.parsed.argv["greyscale"], true);
           });
           it("must update the pipeline", () => {
             const pipeline = getPipeline(cli.parsed.argv);
-            expect(pipeline).to.have.length(1);
-            expect(pipeline).to.include("threshold");
+            assert.equal(pipeline.length, 1);
+            assert.ok(pipeline.includes("threshold"));
           });
           it("must execute the pipeline", () => {
             const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/operations/unflatten.js b/test/cmd/operations/unflatten.js
index 064f519..d4d5ed0 100644
--- a/test/cmd/operations/unflatten.js
+++ b/test/cmd/operations/unflatten.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#unflatten
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -46,8 +48,8 @@ export default function register() {
     // Tests.
     it("must update the pipeline", () => {
       const pipeline = getPipeline(cli.parsed.argv);
-      expect(pipeline).to.have.length(1);
-      expect(pipeline).to.include("unflatten");
+      assert.equal(pipeline.length, 1);
+      assert.ok(pipeline.includes("unflatten"));
     });
     it("must execute the pipeline", () => {
       const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/output.js b/test/cmd/output.js
index 71b211a..f3cabce 100644
--- a/test/cmd/output.js
+++ b/test/cmd/output.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-output#tile
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -47,8 +49,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tile");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tile"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -65,12 +67,12 @@ export default function register() {
 
       // Tests.
       it("must set the size flag", () => {
-        expect(cli.parsed.argv).to.have.property("size", size);
+        assert.equal(cli.parsed.argv["size"], size);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("tile");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("tile"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -88,12 +90,12 @@ export default function register() {
 
         // Tests.
         it("must set the angle flag", () => {
-          expect(cli.parsed.argv).to.have.property("angle", angle);
+          assert.equal(cli.parsed.argv["angle"], angle);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("tile");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("tile"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -110,12 +112,12 @@ export default function register() {
 
         // Tests.
         it("must set the background flag", () => {
-          expect(cli.parsed.argv).to.have.property("background", background);
+          assert.equal(cli.parsed.argv["background"], background);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("tile");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("tile"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -132,12 +134,12 @@ export default function register() {
 
         // Tests.
         it("must set the id flag", () => {
-          expect(cli.parsed.argv).to.have.property("basename", basename);
+          assert.equal(cli.parsed.argv["basename"], basename);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("tile");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("tile"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -150,12 +152,12 @@ export default function register() {
           before(() => cli.parseAsync(["tile", `--${alias}`]));
 
           it("must set the center flag", () => {
-            expect(cli.parsed.argv).to.have.property("center", true);
+            assert.equal(cli.parsed.argv["center"], true);
           });
           it("must update the pipeline", () => {
             const pipeline = getPipeline(cli.parsed.argv);
-            expect(pipeline).to.have.length(1);
-            expect(pipeline).to.include("tile");
+            assert.equal(pipeline.length, 1);
+            assert.ok(pipeline.includes("tile"));
           });
           it("must execute the pipeline", () => {
             const pipeline = drain(cli.parsed.argv);
@@ -173,12 +175,12 @@ export default function register() {
 
         // Tests.
         it("must set the container flag", () => {
-          expect(cli.parsed.argv).to.have.property("container", container);
+          assert.equal(cli.parsed.argv["container"], container);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("tile");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("tile"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -195,12 +197,12 @@ export default function register() {
 
         // Tests.
         it("must set the depth flag", () => {
-          expect(cli.parsed.argv).to.have.property("depth", depth);
+          assert.equal(cli.parsed.argv["depth"], depth);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("tile");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("tile"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -217,12 +219,12 @@ export default function register() {
 
         // Tests.
         it("must set the id flag", () => {
-          expect(cli.parsed.argv).to.have.property("id", id);
+          assert.equal(cli.parsed.argv["id"], id);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("tile");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("tile"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -239,12 +241,12 @@ export default function register() {
 
         // Tests.
         it("must set the layout flag", () => {
-          expect(cli.parsed.argv).to.have.property("layout", layout);
+          assert.equal(cli.parsed.argv["layout"], layout);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("tile");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("tile"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -261,12 +263,12 @@ export default function register() {
 
         // Tests.
         it("must set the overlap flag", () => {
-          expect(cli.parsed.argv).to.have.property("overlap", overlap);
+          assert.equal(cli.parsed.argv["overlap"], overlap);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("tile");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("tile"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -283,12 +285,12 @@ export default function register() {
 
         // Tests.
         it("must set the overlap flag", () => {
-          expect(cli.parsed.argv).to.have.property("skipBlanks", skip);
+          assert.equal(cli.parsed.argv["skipBlanks"], skip);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("tile");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("tile"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/resizing/extend.js b/test/cmd/resizing/extend.js
index 5c26f29..dfface2 100644
--- a/test/cmd/resizing/extend.js
+++ b/test/cmd/resizing/extend.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-resize#extend
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -53,15 +55,15 @@ export default function register() {
       // Tests.
       it("must set the top, bottom, left, and right flags", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("top", args.top);
-        expect(args).to.have.property("bottom", args.bottom);
-        expect(args).to.have.property("left", args.left);
-        expect(args).to.have.property("right", args.right);
+        assert.equal(args["top"], args.top);
+        assert.equal(args["bottom"], args.bottom);
+        assert.equal(args["left"], args.left);
+        assert.equal(args["right"], args.right);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("extend");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("extend"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -94,12 +96,12 @@ export default function register() {
 
         // Tests.
         it("must set the background flag", () => {
-          expect(cli.parsed.argv).to.have.property("background", background);
+          assert.equal(cli.parsed.argv["background"], background);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("extend");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("extend"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -126,12 +128,12 @@ export default function register() {
 
         // Tests.
         it("must set the background flag", () => {
-          expect(cli.parsed.argv).to.have.property("extendWith", mode);
+          assert.equal(cli.parsed.argv["extendWith"], mode);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("extend");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("extend"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/resizing/extract.js b/test/cmd/resizing/extract.js
index 4dd089e..4e8228b 100644
--- a/test/cmd/resizing/extract.js
+++ b/test/cmd/resizing/extract.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-operation#extract
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -53,15 +55,15 @@ export default function register() {
       // Tests.
       it("must set the top, left, width, and height flags", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("top", top);
-        expect(args).to.have.property("left", left);
-        expect(args).to.have.property("width", width);
-        expect(args).to.have.property("height", height);
+        assert.equal(args["top"], top);
+        assert.equal(args["left"], left);
+        assert.equal(args["width"], width);
+        assert.equal(args["height"], height);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("extract");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("extract"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/resizing/resize.js b/test/cmd/resizing/resize.js
index 9b8e388..a6677c1 100644
--- a/test/cmd/resizing/resize.js
+++ b/test/cmd/resizing/resize.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-resize/
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -45,13 +47,13 @@ export default function register() {
     afterEach("sharp", sharp.prototype.reset);
 
     describe("..", () => {
-      it("must prompt an error", async () => {
-        const error = await new Promise((resolve) =>
-          cli.parseAsync(["resize"], (err) => resolve(err)),
+      it("must prompt an error", () => {
+        const promise = new Promise((resolve, reject) =>
+          cli.parseAsync(["resize"], (error) =>
+            error == null ? resolve() : reject(error),
+          ),
         );
-        expect(error).to.exist();
-        expect(error).to.have.property("message");
-        expect(error.message).to.contain("one of width and height");
+        return assert.rejects(promise, "one of width and height");
       });
     });
 
@@ -60,12 +62,12 @@ export default function register() {
 
       it("must set the width flag", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("width", width);
+        assert.equal(args["width"], String(width));
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("resize");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("resize"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -78,12 +80,12 @@ export default function register() {
 
       it("must set the height flag", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("height", height);
+        assert.equal(args["height"], String(height));
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("resize");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("resize"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -98,13 +100,13 @@ export default function register() {
       // Tests.
       it("must set the width and height flags", () => {
         const args = cli.parsed.argv;
-        expect(args).to.have.property("width", width);
-        expect(args).to.have.property("height", height);
+        assert.equal(args["width"], String(width));
+        assert.equal(args["height"], String(height));
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("resize");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("resize"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -112,6 +114,30 @@ export default function register() {
       });
     });
 
+    describe("percentage dimensions", () => {
+      const metadata = { height: 331, width: 500 };
+
+      it("must resize width relative to input metadata", async () => {
+        await cli.parseAsync(["resize", "50%"]);
+        const pipeline = drain(cli.parsed.argv, { metadata });
+        sinon.assert.calledWithMatch(pipeline.resize, 250, null);
+      });
+
+      it("must resize width and height relative to input metadata", async () => {
+        await cli.parseAsync(["resize", "50%", "75%"]);
+        const pipeline = drain(cli.parsed.argv, { metadata });
+        sinon.assert.calledWithMatch(pipeline.resize, 250, 248);
+      });
+
+      it("must fail when input metadata is not set", async () => {
+        await cli.parseAsync(["resize", "50%"]);
+        assert.throws(
+          () => drain(cli.parsed.argv),
+          "metadata is required to resolve percentage",
+        );
+      });
+    });
+
     describe("[options]", () => {
       // @see https://sharp.pixelplumbing.com/api-resize#resize
       describe("--background", () => {
@@ -125,12 +151,12 @@ export default function register() {
 
         // Tests.
         it("must set the background flag", () => {
-          expect(cli.parsed.argv).to.have.property("background", background);
+          assert.equal(cli.parsed.argv["background"], background);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("resize");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("resize"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -150,12 +176,12 @@ export default function register() {
         );
 
         it("must set the fastShrinkOnLoad flag", () => {
-          expect(cli.parsed.argv).to.have.property("fastShrinkOnLoad", false);
+          assert.equal(cli.parsed.argv["fastShrinkOnLoad"], false);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("resize");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("resize"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -176,12 +202,12 @@ export default function register() {
         before(() => cli.parseAsync(["resize", width, height, "--fit", fit]));
 
         it("must set the fit flag", () => {
-          expect(cli.parsed.argv).to.have.property("fit", fit);
+          assert.equal(cli.parsed.argv["fit"], fit);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("resize");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("resize"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -204,12 +230,12 @@ export default function register() {
         );
 
         it("must set the kernel flag", () => {
-          expect(cli.parsed.argv).to.have.property("kernel", kernel);
+          assert.equal(cli.parsed.argv["kernel"], kernel);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("resize");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("resize"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -232,12 +258,12 @@ export default function register() {
         );
 
         it("must set the position flag", () => {
-          expect(cli.parsed.argv).to.have.property("position", position);
+          assert.equal(cli.parsed.argv["position"], position);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("resize");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("resize"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -257,12 +283,12 @@ export default function register() {
         );
 
         it("must set the withoutEnlargement flag", () => {
-          expect(cli.parsed.argv).to.have.property("withoutEnlargement", true);
+          assert.equal(cli.parsed.argv["withoutEnlargement"], true);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("resize");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("resize"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -282,12 +308,12 @@ export default function register() {
         );
 
         it("must set the withoutReduction flag", () => {
-          expect(cli.parsed.argv).to.have.property("withoutReduction", true);
+          assert.equal(cli.parsed.argv["withoutReduction"], true);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("resize");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("resize"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
diff --git a/test/cmd/resizing/trim.js b/test/cmd/resizing/trim.js
index a246a9a..d2e8024 100644
--- a/test/cmd/resizing/trim.js
+++ b/test/cmd/resizing/trim.js
@@ -23,8 +23,10 @@
 
 // @see https://sharp.pixelplumbing.com/api-resize#trim
 
+// Standard lib.
+import assert from "node:assert/strict";
+
 // Package modules.
-import expect from "must";
 import sinon from "sinon";
 
 // Local modules.
@@ -47,8 +49,8 @@ export default function register() {
       // Tests.
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("trim");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("trim"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -65,12 +67,12 @@ export default function register() {
 
       // Tests.
       it("must set the threshold flag", () => {
-        expect(cli.parsed.argv).to.have.property("threshold", threshold);
+        assert.equal(cli.parsed.argv["threshold"], threshold);
       });
       it("must update the pipeline", () => {
         const pipeline = getPipeline(cli.parsed.argv);
-        expect(pipeline).to.have.length(1);
-        expect(pipeline).to.include("trim");
+        assert.equal(pipeline.length, 1);
+        assert.ok(pipeline.includes("trim"));
       });
       it("must execute the pipeline", () => {
         const pipeline = drain(cli.parsed.argv);
@@ -88,12 +90,12 @@ export default function register() {
 
         // Tests.
         it("must set the factor flag", () => {
-          expect(cli.parsed.argv).to.have.property("background", background);
+          assert.equal(cli.parsed.argv["background"], background);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("trim");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("trim"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -107,12 +109,12 @@ export default function register() {
 
         // Tests.
         it("must set the factor flag", () => {
-          expect(cli.parsed.argv).to.have.property("lineArt", true);
+          assert.equal(cli.parsed.argv["lineArt"], true);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("trim");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("trim"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
@@ -129,12 +131,12 @@ export default function register() {
 
         // Tests.
         it("must set the margin flag", () => {
-          expect(cli.parsed.argv).to.have.property("margin", margin);
+          assert.equal(cli.parsed.argv["margin"], margin);
         });
         it("must update the pipeline", () => {
           const pipeline = getPipeline(cli.parsed.argv);
-          expect(pipeline).to.have.length(1);
-          expect(pipeline).to.include("trim");
+          assert.equal(pipeline.length, 1);
+          assert.ok(pipeline.includes("trim"));
         });
         it("must execute the pipeline", () => {
           const pipeline = drain(cli.parsed.argv);
diff --git a/test/convert.js b/test/convert.js
index aa5dbd9..d918a72 100644
--- a/test/convert.js
+++ b/test/convert.js
@@ -22,12 +22,12 @@
  */
 
 // Standard lib.
+import assert from "node:assert/strict";
 import path from "node:path";
 import { Readable, Writable } from "node:stream";
 import { fileURLToPath } from "node:url";
 
 // Package modules.
-import expect from "must";
 import fs from "fs-extra";
 import { temporaryDirectory, temporaryFile } from "tempy";
 
@@ -40,7 +40,7 @@ describe("convert", () => {
   const options = { sequentialRead: false };
   const createContext = () => ({ options, queue: [] });
   const getValue = (result) => {
-    expect(result.status).to.equal("fulfilled");
+    assert.equal(result.status, "fulfilled");
     return result.value;
   };
 
@@ -66,7 +66,7 @@ describe("convert", () => {
       return convert
         .files([input], dest, createContext())
         .then(([result]) =>
-          expect(fs.existsSync(getValue(result).output.path)).to.be.true(),
+          assert.equal(fs.existsSync(getValue(result).output.path), true),
         );
     });
     it("must convert a file formatted based on extension", () => {
@@ -74,9 +74,9 @@ describe("convert", () => {
         .files([input], path.join(dest, "{name}.avif"), createContext())
         .then(([result]) => {
           const info = getValue(result);
-          expect(info.output).to.have.property("format", "heif");
-          expect(info.output).to.have.property("path");
-          expect(info.output.path).to.contain(".avif");
+          assert.equal(info.output["format"], "heif");
+          assert.ok(Object.prototype.hasOwnProperty.call(info.output, "path"));
+          assert.ok(info.output.path.includes(".avif"));
         });
     });
     it("must not write a file during a dry run", () => {
@@ -84,10 +84,10 @@ describe("convert", () => {
       const context = { ...createContext(), dry: true };
       return convert.files([input], dryDest, context).then(([result]) => {
         const info = getValue(result);
-        expect(info.output).to.have.property("format", "jpeg");
-        expect(info.output).to.have.property("size");
-        expect(info.output.path).to.equal(dryDest);
-        expect(fs.existsSync(dryDest)).to.be.false();
+        assert.equal(info.output["format"], "jpeg");
+        assert.ok(Object.prototype.hasOwnProperty.call(info.output, "size"));
+        assert.equal(info.output.path, dryDest);
+        assert.equal(fs.existsSync(dryDest), false);
       });
     });
     it("must return input and output metadata", () => {
@@ -95,18 +95,18 @@ describe("convert", () => {
       const context = { ...createContext(), dry: true, print: true };
       return convert.files([input], output, context).then(([result]) => {
         const info = getValue(result);
-        expect(info.input).to.have.property("format", "jpeg");
-        expect(info.input.path).to.equal(input);
-        expect(info.output).to.have.property("format", "jpeg");
-        expect(info.output.path).to.equal(output);
+        assert.equal(info.input["format"], "jpeg");
+        assert.equal(info.input.path, input);
+        assert.equal(info.output["format"], "jpeg");
+        assert.equal(info.output.path, output);
       });
     });
     it("must return metadata for each file in a batch", () => {
       const context = { ...createContext(), dry: true, print: true };
       return convert.files([input, input], dest, context).then((info) => {
-        expect(info).to.have.length(2);
-        expect(getValue(info[0]).input).to.have.property("format", "jpeg");
-        expect(getValue(info[0]).output).to.have.property("format", "jpeg");
+        assert.equal(info.length, 2);
+        assert.equal(getValue(info[0]).input["format"], "jpeg");
+        assert.equal(getValue(info[0]).output["format"], "jpeg");
       });
     });
     it("must pass the output extension format to queued handlers", () => {
@@ -121,33 +121,43 @@ describe("convert", () => {
       ]);
       return convert
         .files([input], path.join(dest, "{name}.avif"), context)
-        .then(() => expect(format).to.equal("avif"));
+        .then(() => assert.equal(format, "avif"));
     });
     it("must report a file conversion error", () => {
-      // Negative test for directory that does not exist.
-      const rand = "" + Math.random();
+      // Negative test for a parent path that is a file.
+      const output = path.join(copy, "output");
       return convert
-        .files([input, input], rand, createContext())
+        .files([input, input], output, createContext())
         .then(([result]) => {
-          expect(result.status).to.equal("rejected");
-          expect(result.reason).to.have.property("message");
-          expect(result.reason.message).to.contain(`${rand}/input.jpg`);
-          expect(result.reason.message).to.contain("No such file or directory");
+          assert.equal(result.status, "rejected");
+          assert.equal(result.reason.code, "ENOTDIR");
         });
     });
     it("must convert multiple files", () => {
       return convert
         .files([input, input], dest, createContext())
-        .then((info) => expect(info).to.have.length(2));
+        .then((info) => assert.equal(info.length, 2));
     });
     it("must support output templates", () => {
       const rand = Math.random();
       return convert
         .files([input], path.join(dest, `{name}-${rand}{ext}`), createContext())
         .then(([result]) =>
-          expect(getValue(result).output.path).to.contain(`input-${rand}.jpg`),
+          assert.ok(getValue(result).output.path.includes(`input-${rand}.jpg`)),
         );
     });
+    it("must support relative path output templates", async () => {
+      const testDir = path.dirname(path.dirname(input));
+      const results = await convert.files(
+        [path.join(testDir, "**", "*.jpg")],
+        path.join(dest, "{path}", "{base}"),
+        createContext(),
+      );
+      const [result] = results;
+      const outputPath = getValue(result).output.path;
+      assert.equal(outputPath, path.join(dest, "fixtures", "input.jpg"));
+      assert.equal(fs.existsSync(outputPath), true);
+    });
     it("must allow the same file as input and output", () => {
       return convert.files([copy], path.dirname(copy), createContext());
     });
@@ -157,16 +167,7 @@ describe("convert", () => {
       return convert.files([input], dest, context);
     });
     it("must warn if there is no files", () => {
-      return convert
-        .files([])
-        .then(() => {
-          throw new Error("STOP");
-        })
-        .catch((err) => {
-          expect(err).to.exist();
-          expect(err).to.have.property("message");
-          expect(err.message).to.contain("No input files");
-        });
+      return assert.rejects(convert.files([]), { message: "No input files" });
     });
   });
   describe("stream", () => {
@@ -186,25 +187,20 @@ describe("convert", () => {
           createContext(),
         )
         .then((info) => {
-          expect(info.output.format).to.exist();
-          expect(info.output.path).to.equal("stdout");
-          expect(fs.existsSync(dest)).to.be.true();
+          assert.ok(info.output.format != null);
+          assert.equal(info.output.path, "stdout");
+          assert.equal(fs.existsSync(dest), true);
         });
     });
     it("must reject stream errors", () => {
-      return convert
-        .stream(
+      return assert.rejects(
+        convert.stream(
           Readable.from(["not an image"]),
           fs.createWriteStream(dest),
           createContext(),
-        )
-        .then(() => {
-          throw new Error("STOP");
-        })
-        .catch((err) => {
-          expect(err).to.exist();
-          expect(err.message).to.contain("unsupported image format");
-        });
+        ),
+        "unsupported image format",
+      );
     });
 
     it("must reject output stream errors", () => {
@@ -214,12 +210,17 @@ describe("convert", () => {
           callback(error);
         },
       });
-      return convert
-        .stream(fs.createReadStream(input), failingOutput, createContext())
-        .then(() => {
-          throw new Error("STOP");
-        })
-        .catch((err) => expect(err).to.equal(error));
+      return assert.rejects(
+        convert.stream(
+          fs.createReadStream(input),
+          failingOutput,
+          createContext(),
+        ),
+        (err) => {
+          assert.equal(err, error);
+          return true;
+        },
+      );
     });
     it("must not write to the output stream during a dry run", () => {
       const failingOutput = new Writable({
@@ -233,8 +234,8 @@ describe("convert", () => {
           dry: true,
         })
         .then((info) => {
-          expect(info.output).to.have.property("format", "jpeg");
-          expect(info.output).to.have.property("size");
+          assert.equal(info.output["format"], "jpeg");
+          assert.ok(Object.prototype.hasOwnProperty.call(info.output, "size"));
         });
     });
     it("must return input and output metadata", () => {
@@ -250,8 +251,8 @@ describe("convert", () => {
           context,
         )
         .then((info) => {
-          expect(info.input).to.have.property("format", "jpeg");
-          expect(info.output).to.have.property("format", "jpeg");
+          assert.equal(info.input["format"], "jpeg");
+          assert.equal(info.output["format"], "jpeg");
         });
     });
   });
diff --git a/test/index.js b/test/index.js
index 2280d17..04a20ea 100644
--- a/test/index.js
+++ b/test/index.js
@@ -22,11 +22,11 @@
  */
 
 // Standard lib.
+import assert from "node:assert/strict";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 
 // Package modules.
-import expect from "must";
 import fs from "fs-extra";
 import sinon from "sinon";
 import { temporaryDirectory } from "tempy";
@@ -76,7 +76,7 @@ describe("CLI", () => {
       ],
       { logger },
     ).then(() => {
-      expect(fs.existsSync(dest)).to.be.true();
+      assert.equal(fs.existsSync(dest), true);
       sinon.assert.calledWithMatch(logger.log, dest);
       sinon.assert.notCalled(logger.error);
     });
@@ -85,7 +85,7 @@ describe("CLI", () => {
     return cli(["-v"], { logger }).then(() => {
       sinon.assert.calledWith(logger.log, pkg.version);
       sinon.assert.notCalled(logger.error);
-      expect(process.exitCode).not.to.equal(1);
+      assert.notEqual(process.exitCode, 1);
     });
   });
   it("must print metadata", () => {
@@ -93,8 +93,8 @@ describe("CLI", () => {
       logger,
     }).then(() => {
       const [metadata] = JSON.parse(logger.log.firstCall.args[0]);
-      expect(metadata.input).to.have.property("format", "jpeg");
-      expect(metadata.output).to.have.property("width", 100);
+      assert.equal(metadata.input["format"], "jpeg");
+      assert.equal(metadata.output["width"], 100);
       sinon.assert.notCalled(logger.error);
     });
   });
@@ -107,12 +107,12 @@ describe("CLI", () => {
       )
       .then(() => {
         const output = JSON.parse(logger.log.firstCall.args[0]);
-        expect(output).to.have.length(2);
-        expect(output[0]).to.have.property("input");
-        expect(output[0]).to.have.property("output");
-        expect(output[1]).to.have.property("error");
+        assert.equal(output.length, 2);
+        assert.ok(Object.prototype.hasOwnProperty.call(output[0], "input"));
+        assert.ok(Object.prototype.hasOwnProperty.call(output[0], "output"));
+        assert.ok(Object.prototype.hasOwnProperty.call(output[1], "error"));
         sinon.assert.notCalled(logger.error);
-        expect(process.exitCode).to.equal(1);
+        assert.equal(process.exitCode, 1);
       });
   });
   it("must report partial batch failures", () => {
@@ -123,7 +123,7 @@ describe("CLI", () => {
       .then(() => {
         sinon.assert.calledWithMatch(logger.log, path.join(dest, "input.jpg"));
         sinon.assert.calledWithMatch(logger.error, "FAILED:");
-        expect(process.exitCode).to.equal(1);
+        assert.equal(process.exitCode, 1);
       });
   });
   it("must display errors", () => {
@@ -134,7 +134,16 @@ describe("CLI", () => {
         logger.error,
         "Specify --help for available options",
       );
-      expect(process.exitCode).to.equal(1);
+      assert.equal(process.exitCode, 1);
+    });
+  });
+  it("must error when options are incomplete", () => {
+    return cli(["-i", input, "-o", dest, "--density"], { logger }).then(() => {
+      sinon.assert.notCalled(logger.log);
+      sinon.assert.calledWith(
+        logger.error,
+        "Not enough arguments following: density",
+      );
     });
   });
 });
diff --git a/test/utils.js b/test/utils.js
index dc5464e..929fd81 100644
--- a/test/utils.js
+++ b/test/utils.js
@@ -21,8 +21,8 @@
  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
 
-// Package modules.
-import expect from "must";
+// Standard lib.
+import assert from "node:assert/strict";
 
 // Local modules.
 import { isDirectory, pick } from "../lib/utils.js";
@@ -31,22 +31,22 @@ import { isDirectory, pick } from "../lib/utils.js";
 describe("utils", () => {
   describe("isDirectory", () => {
     it("must identify directories", () => {
-      expect(isDirectory(new URL(".", import.meta.url))).to.be.true();
+      assert.equal(isDirectory(new URL(".", import.meta.url)), true);
     });
 
     it("must return false for missing paths", () => {
-      expect(isDirectory(new URL("./missing", import.meta.url))).to.be.false();
+      assert.equal(isDirectory(new URL("./missing", import.meta.url)), false);
     });
   });
 
   describe("pick", () => {
     it("must pick own properties, including falsy values", () => {
       const input = { falseValue: false, nullValue: null, zero: 0 };
-      expect(pick(input, ["falseValue", "nullValue", "zero"])).to.eql(input);
+      assert.deepEqual(pick(input, ["falseValue", "nullValue", "zero"]), input);
     });
 
     it("must omit missing properties", () => {
-      expect(pick({ value: 1 }, ["missing"])).to.eql({});
+      assert.deepEqual(pick({ value: 1 }, ["missing"]), {});
     });
   });
 });