You may never get a chance to use it. Who knows it may make a come back.

callerName function.ts

//tricky because it's becoming less and less supported but this is how you did it:

static callerName(func: Function): void {
        let callingFunction: string = '';
        callingFunction = func.caller.name;
        const dateTime: string = this.getDateTime();
        console.log('***-> ' + dateTime + ' <-###-> ' + func.name + ' is being called by: ' + callingFunction);
    }