Tests fail when using TypeScript project references

🐛 Bug Report

I’m in the process of migrating one of my projects to use Typescript project references, but after migration the tests that validated error types failed.

I’ve created a repo that has one directory with a very small project where tests succeed, and one directory with a project using typescript projects references where the tests fail. The projects are identical with the exception of project references. I’m not saying that ts-jest is to blame. It could as well be my understanding of project references or jest.

To Reproduce

git clone https://github.com/FantasticFiasco/jest-error-type-issue.git
cd jest-error-type-issue/does-not-work
yarn
yarn test

Expected behavior

I would expect the test to pass, because in the same git repository there is a directory called works with an identical project except the project references that has a test that passes.

Link to repo (highly encouraged)

https://github.com/FantasticFiasco/jest-error-type-issue

Debug log:

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envinfo

System:
    OS: macOS Catalina v10.15.4

Npm packages:
    jest: v25.5.4
    ts-jest: v25.5.1
    typescript: v3.9.2

[tommysullivan]

@rhyek same.

if i run yarn workspace subproject1 build, and then in the subproject1 folder’s package.json i define build to do a tsc -b tsconfig.subproject1.json, where this tsconfig contains references to subproject2, which has its own package.json and tsconfig etc, then, everything compiles, all the dist folders are there, and my jest tests, located in subproject1, work just fine.

if i do not build myself, then it complains Cannot find module 'subproject1' or its corresponding type declarations., regardless of whether or not I attempt to use moduleNameMapper in subproject1’s jest config.

So, bottom line is that it seems that ts-jest is not doing what tsc -b would do, so when in watch mode, i really suffer.

[alexbruno]

I know this is an old issue, but if anyone else is running into similar problems… I just made this on Jest config and it worked for me:

  globals: {
    'ts-jest': {
      isolatedModules: true,
    },
  }