Traceur error

README.md

npm install
./node_modules/.bin/traceur --out out.js test.js

node main.js

main.js

var test = require('traceur').require('./test.js');
console.log(1, test);

out.js

System.register("test", [], function() {
  "use strict";
  var $__0 = this;
  var __moduleName = "test";
  var foo = (function() {
    $__0;
  });
  module.exports = {foo: 'bar'};
  return {};
});
System.get("test" + '');

package.json

{
  "name": "traceur-error",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "traceur": "0.0.72"
  }
}

test.js

var foo = () => {
    this;
};

module.exports = { foo: 'bar' };

❯ node main.js
1 {}

Should be:

❯ node main.js
1 { foo: 'bar' }

To correctly emulate the traceur.require you need to compile with commonjs:

./node_modules/.bin/traceur --modules=commonjs --out out.js test.js

The resulting commonjs module fails because this is used in module scope. That causes our code to add the extra outer function wrapper. Once we make such use of this illegal in module scope, this bug will also be fixed. See #1478