How do you find out the caller function in JavaScript when use strict is enabled?

Answer 1

  functionName() {
    return new Error().stack.match(/ at (\S+)/g)[1].get(/ at (.+)/);
  }

  // Get - extract regex
  String.prototype.get = function(pattern, defaultValue = "") {
    if(pattern.test(this)) {
      var match = this.match(pattern);
      return match[1] || match[0];
    }
    return defaultValue; // if nothing is found, the answer is known, so it's not null
  }