Parcel: Uncaught ReferenceError: regeneratorRuntime is not defined

[brucou]

🐛 bug report

When I started using generators in my code. I got the error message when running : Uncaught ReferenceError: regeneratorRuntime is not defined.

🎛 Configuration (.babelrc, package.json, cli command)

```.babelrc
{
"plugins": [
["@babel/plugin-transform-runtime", {
"corejs": 2
}]
]
}

```json
  "devDependencies": {
    "babel-cli": "^7.0.0-beta.3",
    "babel-core": "^7.0.0-beta.3",
    "babel-plugin-transform-class-properties": "^7.0.0-beta.3",
    "babel-plugin-transform-object-assign": "^7.0.0-beta.3",
    "babel-plugin-transform-runtime": "^7.0.0-beta.3",
    "babel-preset-es2015": "^7.0.0-beta.3",
    "babel-preset-react": "^7.0.0-beta.3",
    "babel-preset-stage-0": "^7.0.0-beta.3",
    "babel-runtime": "^7.0.0-beta.3",
    "babelify": "^7.3.0",
    "parcel-bundler": "^1.10.3",
    "qunitjs": "^1.20.0"
  },
  "dependencies": {
    "babel-polyfill": "^7.0.0-beta.3"
  }

🤔 Expected Behavior

generator should just work.

😯 Current Behavior

Uncaught ReferenceError: regeneratorRuntime is not defined
    at Object.parcelRequire.../src/index.js../helpers (index.js:4)
    at newRequire (test.e31bb0bc.js:49)
    at localRequire (test.e31bb0bc.js:55)
    at Object.parcelRequire.graph-edge-traversal.specs.js.qunitjs (graph-edge-traversal.specs.js:2)
    at newRequire (test.e31bb0bc.js:49)
    at localRequire (test.e31bb0bc.js:55)
    at Object.parcelRequire.index.js../graph-edge-traversal.specs (index.js:1)
    at newRequire (test.e31bb0bc.js:49)
    at parcelRequire.../node_modules/process/browser.js (test.e31bb0bc.js:81)
    at test.e31bb0bc.js:107

💁 Possible Solution

This is related to #1762. However, adding import "babel-polyfill" in my index.js made it work. I however cannot do that, I bundle with rollup and that breaks my rollup bundle.

🔦 Context

💻 Code Sample

Cf. test directory
Cf. package.json

🌍 Your Environment

    "babel-runtime": "^7.0.0-beta.3",
    "parcel-bundler": "^1.10.3",

| Software | Version(s) |
| ---------------- | ---------- |
| Parcel | 1.10.3
| Node | 8.2.0
| npm/Yarn | npm
| Operating System | windows 10

[nihey]

I've had the same issue. Downgrading to [email protected] solved it.

[wareus]

Duplicate?
https://github.com/parcel-bundler/parcel/issues/1762

[adrigardi90]

Same problem!

[DeMoorJasper]

Closing as it's a duplicate

[crapthings]

how to solve ?

[felipemullen]

how to solve ?

If you are targeting modern browsers, a simple solution is to add the browserslist property to your package.json file

{
    "name": "my-app",
    ...
    "browserslist": [
        "last 1 Chrome versions"
    ],
    ...
}

Note: you can change last 1 to last 2 or 3 or however far back you decide to go

[andreamendi]

how to solve ?

If you are targeting modern browsers, a simple solution is to add the browserslist property to your package.json file

{
    "name": "my-app",
    ...
    "browserslist": [
        "last 1 Chrome versions"
    ],
    ...
}

Note: you can change last 1 to last 2 or 3 or however far back you decide to go

Hey! I did it, but still the issue.

[felipemullen]

@andreamendi
Can you post your package.json file

[Shuunen]

@felipemullen 's solution worked for me , thx mate 👍

[cooljl31]

@felipemullen by update the package.json the issue get solved i'm curio where is the this documented 😄

[felipemullen]

It doesn't appear to be documented within on the parcel website, but looking at the npm package it appears to depend on babel, and babel in turn has a dependency on the browserslist package, which uses that configuration.

You can read more about it and how to configure properly here:
https://github.com/browserslist/browserslist

[dy]

 "browserslist": [
        "last 1 Chrome versions"
    ],

does not solve the issue if you need to debug for safari

[BobanBg79]

"browserslist": [
        "last 1 Chrome versions"
    ],

this solved problem for me. @felipemullen thank you!

[amrayoub]

Add to your package.json"browserslist": [ "last 2 Chrome versions" ]

you can change the browser you're using, It doesn't have to be only chrome