How to specify path to tsconfig.json?

[emlai]

jest-runner-tsd is finding the wrong tsconfig.json (the one in a package subdirectory), instead of the correct one we use for tests (tsconfig.test.json at the root of the repo).

How can I tell jest-runner-tsd to use this custom tsconfig file?

[mrazauskas]

It is not possible to specify the path explicitly.

tsd-lite picks up the closes tsconfig.json for each test file. Consider this file structure:

├── __typetests__
│   └── SampleType.test.ts
│   └── tsconfig.json
├── package.json
├── tsconfig.json
└── tsconfig.typetest.json

Here the file __typetests__/tsconfig.json has the following content:

{
  "extends": "../tsconfig.typetest.json",
  "include": ["./**/*"]
}

This is more or less how type testing is set up in Jest repo, see: https://github.com/jestjs/jest/blob/main/packages/expect/__typetests__/

---

Other solutions are possible. If the above suggestion does not work for your file structure, please provide more details on your setup.

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The thing is that it is rather clumsy to pass additional options to the runners. For instance, Jest would not allow a --tsconfigPath flag. In the other hand, your IDE picks up nearest tsconfig.json for each file and uses compiler options found there. Nice to keep IDE and type test output in sync.

[emlai]

We have the tests in the same folder as the component they're testing. So having a parent tsconfig.json for just the tests is not possible. Our file structure looks more or less like this:

├── component-a
│   └── component-a.ts
│   └── component-a.test.ts
│   └── component-a.test.types.ts
├── component-b
│   └── component-b.ts
│   └── component-b.test.ts
│   └── component-b.test.types.ts
├── package.json
├── tsconfig.json
└── tsconfig.test.json

The main tsconfig.json doesn't include test files, only the actual code that makes up the release bundle.

tsconfig.test.json on the other hand includes all test files, nothing else.

[mrazauskas]

Thanks for the details. Does your tsconfig.json also include:

{
  "references": [{ "path": "./tsconfig.test.json" }]
}

So that IDE could pick up the right config for test files? Reference: https://vite.new/react-ts

---

Ideally tsd-lite should look at references and use tsconfig.test.json, but it does not. Current implementation is using only compilerOptions and ignores all other fields. A quick fix: hardcode the path to ./tsconfig.test.json by patching this line: https://github.com/mrazauskas/tsd-lite/blob/ed190910b7983c10691f5cce9c1a2fd01bdb3247/source/utils/resolveCompilerOptions.ts#L8

---

The solution to this problem is coming with brand new type testing tool which is mentioned in #32. It respects all fields of TSConfig and picks up configuration just like IDEs do. (I.e. the references field must be there.)

Currently I work on documentation. The plan is to publish the package in some 2-3 months. The sooner the better, of course (;

[emlai]

Thanks!

We don't currently pass tsconfig.test.json to references, only to ts-jest directly.

Anyway, I ended up auto-generating the typing tests for all components on the fly when running tests, and running the resulting temporary file in a folder with a tsconfig.json. So I'm unblocked for now :)

[mrazauskas]

Just a quick note, the testing tool I was mentioning before is freshly published. For details, see: #32 (comment)

So I think we can close this for now.