jest: babel 7 inconsistent transformation
🐛 Bug Report
When upgrading to babel 7 some files are not being transformed. I have both babel-core@7.0.0-bridge.0 and babel-jest installed.
Example error message:
To Reproduce
https://github.com/chrisblossom/backtrack/tree/babel-7
git clone https://github.com/chrisblossom/backtrack.git
cd backtrack
git checkout babel-7
npm install
npm run test
jest --clearCache sometimes helps some tests pass.
Expected behavior
All tests pass.
Link to repl or repo (highly encouraged)
https://github.com/chrisblossom/backtrack/tree/babel-7 https://github.com/chrisblossom/backtrack/commit/697617c7f499c2c8e4c0dd2b7056c1d070a10fcf
Run npx envinfo --preset jest
System:
OS: macOS High Sierra 10.13.6
CPU: x64 Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz
Binaries:
Node: 8.11.4 - ~/.nvm/versions/node/v8.11.4/bin/node
Yarn: 1.9.4 - /usr/local/bin/yarn
npm: 6.4.1 - ~/.nvm/versions/node/v8.11.4/bin/npm
npmPackages:
jest: ^23.6.0 => 23.6.0
About this issue
- Original URL
- State: closed
- Created 6 years ago
- Reactions: 1
- Comments: 17 (3 by maintainers)
I think the problem is that
babel-jestexpects babel configuration filebabel.config.jsto simply return a JS object:https://github.com/facebook/jest/blob/master/packages/babel-jest/src/index.js#L58
while babel js started to promote a config API which allows to return a function:
https://babeljs.io/docs/en/config-files#config-function-api
and this is what we have in the example repo project:
https://github.com/chrisblossom/backtrack/blob/babel-7/.babelrc.js