Jest cli suddently has stopped working, all test fails with:

Cannot find module 'babel-preset-env' from '/PATH'- Did you mean "@babel/env"?

I'm sure it is some kind of incompatibility between a module which uses babel 6 and my project with babel 7, but I'm not sure how can I solve.

This is package.json

{"name": "testing101","version": "1.0.0","description": "","main": "index.js","scripts": {"start": "parcel index.html","test": "jest src/*.js --watchAll","nyc": "nyc ava","build": "babel src/*.js -d dist"},"keywords": [],"author": "","license": "ISC","devDependencies": {"@babel/core": "^7.4.5","@babel/preset-env": "^7.4.5","@types/jest": "^24.0.13","jest": "^24.8.0","nyc": "^14.1.1","parcel-bundler": "^1.7.0"},"jest": {"verbose": true,"testURL": "http://localhost:1234/","collectCoverage": true},"dependencies": {"axios": "^0.18.0","nock": "^10.0.6"}}

This is .babelrc

{"presets": ["@babel/preset-env"],"env": {"test": {"presets": ["env"]}}}
5

Best Answer


In the test section of the .babelrc file you have accidentally used an unscoped preset ("presets": ["env"]). This used to be the way to do it before Babel 7 and the @babel scope. More than that, since you are already configuring @babel/preset-env as a global preset, you don't need to define it again for the test environment. Removing the entire test environment configuration as bellow should fix your problem:

{"presets": ["@babel/preset-env"]}

you can try this via npm

npm install --save-dev @babel/preset-env

This worked for me:

.babelrc

{"presets": ["@babel/preset-env"]}

.eslintrc (add @babel/core to the existing list of configs)

{"extends": ["@babel/core", ...EXISTING-CONFIGS-HERE]}

I met this problem when I opened 2 terminal with 2 different versions of node. ( I installed NVM to use different versions of nodes )

  • terminal 1: npm install ( correct, this is node 14 )
  • terminal 2: npm run dev ( error, this is node 16 )

so the solution is quite simple:

  1. remove the node_modules
  2. run npm install and npm run dev with the same node version.

I was having the same issue with ReactJS project built using Sanity.I added the below code to .eslintrc

{"extends": ["@sanity/eslint-config-studio", "@babel/core"]}