Jest: Error in [email protected]

Created on 10 Aug 2016 · 8Comments · Source: facebook/jest

Error in running test in [email protected]
it works in [email protected]

Using Jest CLI v14.1.0, jasmine2, babel-jest, jest-react-native preset
 FAIL  __tests__/Intro-test.js (0s)
● Runtime Error
  - ReferenceError: fetch is not defined
        at Object.<anonymous> (node_modules/react-native/Libraries/Fetch/fetch.js:17:23)
1 test suite failed, 0 tests passed (0 total in 1 test suite, run time 8.169s)

Source

saleehk

👍8

Most helpful comment

It's fine if we bump the peer-dep to 0.31. That way people with react-native 0.30 can use 14.1.2 and we'll publish 14.2.0 to work with 0.31.

cpojer on 10 Aug 2016

👍3

All 8 comments

This is caused by https://github.com/facebook/react-native/commit/eb7442ba09dc13cc32c6eab8f42eb6ad6fad1651

patrys on 10 Aug 2016

Looks like we need to change this line, but I guess it needs to be done in a way to support React Native 0.30 and 0.31

https://github.com/facebook/jest/blob/master/packages/jest-react-native/src/index.js#L31

DaleLJefferson on 10 Aug 2016

👍1

It's fine if we bump the peer-dep to 0.31. That way people with react-native 0.30 can use 14.1.2 and we'll publish 14.2.0 to work with 0.31.

cpojer on 10 Aug 2016

👍3

I've opened a PR for react-native that should fix this in a backwards-compatible way. Otherwise jest could just import from whatwg-fetch directly.

patrys on 10 Aug 2016

(this was fixed in the latest update to jest-react-native).

cpojer on 15 Aug 2016

👍1

Getting the same ReferenceError: fetch is not defined when running npm test on a fairly fresh project.

react: "15.4.2",
react-native: "0.42.0"
babel-jest: "19.0.0,
babel-preset-react-native: "1.9.1"
jest: "19.0.2",
react-test-renderer: "15.4.2"

buckhx on 6 Mar 2017

@buckhx Upgrading react-native, babel-jest, and jest to latest versions worked for us.

lukewlms on 6 Jun 2017

Having the same issue with

react-native-cli: 2.0.1
react-native: 0.48.1
jest: 21.0.1

The project is written in typescript. App works but jest tests fail due to missing fetch. When I import fetch from isomorphic-fetch tests work but app is not.