missing export build from package.json in v9.0.0

[NicolasTsc]

Hi I just updated the jest-preset-angular version and now receive another error when trying to run example tests.

🐛 Bug Report

File not found: jest-preset-angular/build/InlineFilesTransformer (resolved as: C:\Users___\Documents\frontend\jest-preset-angular\build\InlineFilesTransformer)

To Reproduce

Steps to reproduce the behavior:

Run ng test

Expected behavior

Tests should run

Link to repo (highly encouraged)

https://github.com/NicolasTsc/jest-angular

Error log:

  ● Test suite failed to run

    File not found: jest-preset-angular/build/InlineFilesTransformer (resolved as: C:\Users\___\Documents\frontend\jest-preset-angular\build\InlineFilesTransformer)

      at ConfigSet.resolvePath (node_modules/ts-jest/dist/config/config-set.js:444:19)
      at node_modules/ts-jest/dist/config/config-set.js:225:46
          at Array.map (<anonymous>)
      at resolveTransformers (node_modules/ts-jest/dist/config/config-set.js:223:37)
      at ConfigSet._setupConfigSet (node_modules/ts-jest/dist/config/config-set.js:233:137)
      at new ConfigSet (node_modules/ts-jest/dist/config/config-set.js:142:14)
      at NgJestTransformer.TsJestTransformer._createConfigSet (node_modules/ts-jest/dist/ts-jest-transformer.js:111:16)
      at NgJestTransformer.TsJestTransformer._configsFor (node_modules/ts-jest/dist/ts-jest-transformer.js:89:34)
      at NgJestTransformer.TsJestTransformer.getCacheKey (node_modules/ts-jest/dist/ts-jest-transformer.js:172:28)
      at ScriptTransformer._getCacheKey (node_modules/@jest/transform/build/ScriptTransformer.js:280:41)

System:
OS: Windows 10

Npm packages:
jest: 27.0.1
jest-preset-angular: 9.0.0
typescript: 4.2.4

[ahnpnl]

Please check this comment #925 (comment)

[NicolasTsc]

If I understand the changelog correctly I have to add snapshotSerializers by adding
const jestPresetAngularSerializers = require('jest-preset-angular/build/serializers')
at the top of the jest.config.js and inside the module.exports
snapshotSerializers: jestPresetAngularSerializers,.

When I try to run the test I receive the error
An unhandled exception occurred: Package subpath './build/serializers' is not defined by "exports" in

Is there anything I missed from the changelog?

[ahnpnl]

You can omit entirely snapshotSerializers and use only preset: 'jest-preset-angular'

[ahnpnl]

The error about An unhandled exception occurred: Package subpath './build/serializers' is not defined by "exports" in is a valid error because missing export for build.

Example config is here https://github.com/thymikee/jest-preset-angular/blob/master/examples/example-app-v12/jest.config.js

[NicolasTsc]

Okay thanks for clarifying. The error occures when using the example config too.

[ahnpnl]

I see your jest config in your repo is already migrated correctly :)

[NicolasTsc]

Thanks for fixing it so quickly. How can I get the new changes?

[ahnpnl]

should be fixed now with 9.0.1

[NicolasTsc]

I now have the error:
``
● Test suite failed to run

File not found: jest-preset-angular/build/InlineFilesTransformer 

``

[ahnpnl]

that file doesn't exist anymore in v9.0.0 you need to remove it from your jest config. It is mentioned in CHANGELOG.

Also make sure to clear Jest cache via jest --clearCache so that new changes are always applicable.

[NicolasTsc]

Yeah this file isn`t reference in my jest config. I tried clearing the cache and deleted / reinstalled my node_modules but the problem stays. You can check my repo for the jest-config. I also tried it with another repository but have the same error unfortunately

[ahnpnl]

The current version of @angular-builder/jest doesn't support v9.0.0 . Please follow this just-jeb/angular-builders#913

In summary, if you are using @angular-builder/jest, you cannot use Jest 27 and jest-preset-angular 9.0.0 :)

[NicolasTsc]

Do I need to use @angular-builder/jest? I need Jest 27 to import some modules I couldn`t import before.

[ahnpnl]

In your repo, if you replace "test": "ng test" by "test": "jest" to bypass @angular-builder/jest, it will work.

@angular-builder/jest is a way to execute Jest with ng test. It is not required.