Gatsby: Develop failure: ReferenceError: regeneratorRuntime is not defined

[EricSong8612]

when I add gatsby-source-contentful in plugins, I get error:

the gatsby-config.js is like:

[KyleAMathews]

This issue should be fixed now.

[KyleAMathews]

Update to the latest version.

[whmountains]

I still have this problem after upgrading to Gatsby v1.8.16. Tried nuking .cache but no change.

I started getting the error when I added an async function to my code. Am I supposed to install the babel runtime or is this a bug in Gatsby?

[pie6k]

I've got exactly the same issue as @whmountains . I'm using gatsby with typescript and it happens when I want to use async functions.

[auser]

How did you fix it, @pie6k ?

[pie6k]

I didn't. @auser

[Jaikant]

I am facing the same error, any suggestions!

Uncaught (in promise) ReferenceError: regeneratorRuntime is not defined
    at Login.js:53
    at Login.js:65
    at Object../src/containers/Login.js (Login.js:102)
    at __webpack_require__ (bootstrap e58e01e5cf6cfda1fba5:555)
    at fn (bootstrap e58e01e5cf6cfda1fba5:86)
    at Object../src/pages/login.js (login.js:1)
    at __webpack_require__ (bootstrap e58e01e5cf6cfda1fba5:555)
    at fn (bootstrap e58e01e5cf6cfda1fba5:86)
    at Object../.cache/sync-requires.js (sync-requires.js:15)
    at __webpack_require__ (bootstrap e58e01e5cf6cfda1fba5:555)

[serby]

@Jaikant Your issue looks like in the browser app you've not included the babel-polyfill or regenerator-runtime

Try adding the below to gatsby-browser.js

exports.onClientEntry = () => {
  require('babel-polyfill')
}

https://www.gatsbyjs.org/docs/browser-apis/