Why Am I Getting \'regeneratorRuntime is not defined\' When Using Async/Await with Babel 6?

"Babel 6 regeneratorRuntime is not defined" Explained

When implementing async/await in Babel 6, the "regeneratorRuntime is not defined" error commonly arises. To rectify this issue, one must additionally install and include babel-polyfill.

Installing Babel Dependencies

To use async/await, install these dependencies:

npm i -D babel-core babel-polyfill babel-preset-es2015 babel-preset-stage-0 babel-loader

Updating package.json

Add the following to "devDependencies":

"babel-polyfill": "^6.0.16"

Maintaining .babelrc

Keep the settings as is:

{
  "presets": [ "es2015", "stage-0" ]
}

Setting Up Async/await**

Enable async/await in your code:

"use strict";

export default async function foo() {
  var s = await bar();
  console.log(s);
}

function bar() {
  return "bar";
}

Loading Required Packages

In your startup file, include:

require("babel-core/register");
require("babel-polyfill");

Webpack Configuration

If using webpack, ensure babel-polyfill is the first entry:

module.exports = {
  entry: ['babel-polyfill', './test.js'],

  output: {
    filename: 'bundle.js'       
  },

  module: {
    loaders: [
      { test: /\.jsx?$/, loader: 'babel', }
    ]
  }
};

Testing with Babel

Run tests with Babel using:

mocha --compilers js:babel-core/register --require babel-polyfill

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