Ts-jest: Cannot find module '@babel/core'

[tyler-johnson]

Issue:

When I run Jest tests I get Cannot find module '@babel/core'. Prior to v23.1.0 this did not error as babel-core was used.

Expected behavior:

I'm not sure if this was intentional or not. Either this shouldn't throw when babel-core is present or peerDependencies should be updated and possibly a major version bump should be made.

[scttcper]

preprocessor.js seems to be missing in v23.1.0

I have the older <rootDir>/node_modules/ts-jest/preprocessor.js in my transform settings (which is a reference to ts-jest/dist/preprocessor.js) both files are missing.

[stevenzeck]

@babel/core should at least be a peer dependency.

[ohpyupi]

Got the same issue here

[huafu]

@scttcper for the preprocessor.js, you should replace any transform in the jest config with <rootDir>/node_modules/ts-jest/preprocessor.js to just ts-jest.

For the @babel/core, installing the @babel/core will do the trick. Working right now on a patch for both

[ahnpnl]

@huafu I think we should describe breaking changes in the release page. I think we forgot about that.

[azu]

Workaround if you does not require babel.

// pacakge.json
"jest": {
    "globals": {
      "ts-jest": {
        "skipBabel": true
      }
    }
}

[huafu]

@azu thanks. Actually it's not a workaround, it's expected to not use neither load babel if you set this flag.
Also don't forget to read the new (but to be completed) troubleshooting page 😉

[byCedric]

Greenkeeper and travis are still reporting this issue with missing babel, even when upgrading to 23.1.1. See Travis for full log.

[huafu]

thx @byCedric, looking at it now

[huafu]

@byCedric https://travis-ci.com/byCedric/semantic-release-expo/builds/80860820

[byCedric]

@huafu ah thanks! You are quick! Almost quicker than the notifications of the automated tools 😬 Looks good and again, thanks for the fix!

[huafu]

thanks @byCedric. And thanks @kulshekhar for taking care of the merging and publishing quickly as well!