How to Fix the \'regeneratorRuntime is not defined\' Error in Babel 6 with Async/Await?

Resolving "regeneratorRuntime is not defined" Error with Babel 6 Async/Await

When attempting to implement async/await functionality in Babel 6, developers may encounter the "regeneratorRuntime is not defined" error. This is because, unlike in later versions of Babel, async/await support requires the babel-polyfill package in Babel 6.

Solution:

1. Install babel-polyfill:

   npm i -D babel-polyfill

2. Update package.json:

   "devDependencies": {
     "babel-polyfill": "^6.0.16",
   }

3. Modify webpack configuration (if applicable):
   In webpack.config.js, make sure babel-polyfill is the first entry in the entry array:

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

4. Setup babel-polyfill and babel-core in the startup file:

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

Example Code:

"use strict";

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

function bar() {
  return "bar";
}

Running Tests with Babel:

When running tests with Babel, use the following command:

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

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