babel: Babel "babel-plugin-transform-runtime" transpiled file throws "regeneratorRuntime is not defined" error (T6676)

Issue originally made by @d6u

Bug information

• Babel version: 6.2.1
• Node version: 0.10.40
• npm version: 2.14.12

Options

package.json

  "dependencies": {
    "babel-core": "^6.2.1",
    "babel-plugin-transform-runtime": "^6.1.18",
    "babel-preset-es2015": "^6.1.18",
    "babel-runtime": "6.0.8"
  },
  "devDependencies": {
    "babel-cli": "^6.2.0"
  }

.babelrc

{
  "presets": ["es2015"],
  "plugins": ["transform-runtime"]
}

Terminal

$ babel index.es6 > index.js
$ node index.js

/Users/daiwei/dev/temp/babel6/index.js:57
      throw _iteratorError;
            ^
ReferenceError: regeneratorRuntime is not defined
    at iter (/Users/daiwei/dev/temp/babel6/index.js:16:10)
    at Object.<anonymous> (/Users/daiwei/dev/temp/babel6/index.js:42:51)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:935:3

Input code

index.es6

function *iter() {
  yield 1;
  yield 2;
  yield 3;
}

for (let n of iter()) {
  console.log(n);
}

Description

When transpiling es2015 scripts into es5, and run in node 0.10. regeneratorRuntime is not defined in transpiled es2015 file. The first few lines of the es5 file looks like:

"use strict";

var _getIterator2 = require("babel-runtime/core-js/get-iterator");

var _getIterator3 = _interopRequireDefault(_getIterator2);

var _regenerator = require("babel-runtime/regenerator");

var _regenerator2 = _interopRequireDefault(_regenerator);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var _marked = [iter].map(_regenerator2.default.mark);

function iter() {
  return regeneratorRuntime.wrap(function iter$(_context) {
    while (1) switch (_context.prev = _context.next) {
      case 0:
        _context.next = 2;
        return 1;
....
....

Where regeneratorRuntime was never defined. Requiring babel-polyfill will solve the problem, but requiring babel-ployfill is not necessary in Babel 5. In Babel 5 with --optional runtime, the output es5 file top looks like:

"use strict";

var _regeneratorRuntime = require("babel-runtime/regenerator")["default"];

var _getIterator = require("babel-runtime/core-js/get-iterator")["default"];

var marked0$0 = [iter].map(_regeneratorRuntime.mark);
function iter() {
  return _regeneratorRuntime.wrap(function iter$(context$1$0) {
    while (1) switch (context$1$0.prev = context$1$0.next) {
      case 0:
        context$1$0.next = 2;
        return 1;

You can see clearly _regeneratorRuntime is defined here.