Guess current script

guessCurrentScript.js

/*
  Attempt to guess which <script src=""> tag loaded the current file.
  
  If the file was loaded as a chunk by Webpack, try and find the webpack root. 
*/

function guessCurrentScript() {
  var err = new Error();
  Error.stackTraceLimit = 100;
  var stack = err.stack;
  var getAnchor = function(href) {
      var l = document.createElement("a");
      l.href = href;
      return l;
  };
  
  var needle;
  var regex = new RegExp("(http.+):[0-9]+:[0-9]+$",'i');
  var webpackModuleRegex = new RegExp("webpackJsonpCallback.+((http.+):[0-9]+:[0-9]+)", 'i');
  var matches = stack.match(regex);
  var webpackMatches = stack.match(webpackModuleRegex);
  var scriptSrc = webpackMatches.length ? webpackMatches[2] : matches[1];
  var path = getAnchor(scriptSrc).pathname;

  for (var i = 0; i < document.scripts.length; i++) {
      var script = document.scripts[i];
      if (script.src ===  scriptSrc || script.src === path) {
          needle = script;
      }
  }
  return needle;
}


console.log('currentScript', guessCurrentScript());