CODE EXAMPLE FOR TYPESCRIPT

add custom function to google sheets

/** 
 * Calculates Pro
 *  @customFunction
 */

function ProfitPostTax(Sales,COGS,OtherExp){
  return (Sales,COGS,OtherExp)- ((Sales-COGS-OtherExp)*.21)
}

//You need to add @customfunction tag to show list in google sheet