message: fix: pacify babelHelpers correctly
diff: @@ -8,7 +8,6 @@ export default file => {
  // prepare script and context
  const sandbox = {
  - self: sandbox,
  module,
  exports,
  require,
  @@ -16,6 +15,8 @@ export default file => {
  __dirname
  };
  + sandbox.global = sandbox;
  +
  const context = new Context(sandbox);
  const script = new Script(source);
  