Fix sourcemaps in JSXTransformer for Firefox

Fixes facebook#1725

Author: zpao

vendor/browser-transforms.js

@@ -20,6 +20,7 @@
 var runScripts;
 var loadScripts;
 var headEl;
+var dummyAnchor;
 
 var buffer = require('buffer');
 var transform = require('jstransform').transform;
@@ -124,13 +125,20 @@ var transformCode = function(code, source, options) {
  if (inlineScriptCount > 1) {
  source += ' (' + inlineScriptCount + ')';
  }
+ } else if (dummyAnchor) {
+ // Firefox has problems when the sourcemap source is a proper URL with a
+ // protocol and hostname, so use the pathname. We could use just the
+ // filename, but hopefully using the full path will prevent potential
+ // issues where the same filename exists in multiple directories.
+ dummyAnchor.href = source;
+ source = dummyAnchor.pathname.substr(1);
  }
  map.sources = [source];
  map.sourcesContent = [code];
 
  return (
  transformed.code +
- '//# sourceMappingURL=data:application/json;base64,' +
+ '\n//# sourceMappingURL=data:application/json;base64,' +
  buffer.Buffer(JSON.stringify(map)).toString('base64')
  );
  } else {
@@ -226,6 +234,7 @@ runScripts = function() {
 
 if (typeof window !== "undefined" && window !== null) {
  headEl = document.getElementsByTagName('head')[0];
+ dummyAnchor = document.createElement('a');
 
  if (window.addEventListener) {
  window.addEventListener('DOMContentLoaded', runScripts, false);