Function: getCustomRangeSlice()

function getCustomRangeSlice(
   body, 
   startOffset, 
   endOffset): {
  customRanges: {
     endIndex: number;
     properties: Record<string, any>;
     rangeId: string;
     rangeType: number;
     startIndex: number;
     wholeEntity: boolean;
    }[];
  leftOffset: number;
  rightOffset: number;
}

{
  customRanges: {
     endIndex: number;
     properties: Record<string, any>;
     rangeId: string;
     rangeType: number;
     startIndex: number;
     wholeEntity: boolean;
    }[];
  leftOffset: number;
  rightOffset: number;
}