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TaskClassFn

Represents the callback that is used by the taskClass property.

 public taskCallback(dataItem: any): any {
   const moreThanHalfCompleted = dataItem.completionRatio > 0.5;
   return {
     'more-than-half': moreThanHalfCompleted,
     'less-than-half': !moreThanHalfCompleted
   };
 }