Quasi-random error when including module copied to node_modules on Linux

Issue

I’m getting an Unable to require .d.ts file error when including a TS module from the node_modules folder. I managed to reproduce the bug in a minimal repo: when linking a module with npm link, the build works fine but when copying the same code to node_modules Jest spits out the error.

Note that this reproduces ONLY on Linux / Mac but works fine on Windows.

To me it’s extremely weird that the same code builds on Windows but doesn’t build on Linux; even more weird the fact that the same code compiles when it’s symlinked to node_modules but doesn’t compile when it’s copied to node_modules.

Note that the solution applied in issue #205 fixes the problem in the minimal repo but it does not fix the problem in the original repo. Due to the nature of the bug (windows / linux, symlink / copy) I tend to think that this fix is rather a workaround than a complete fix to the actual problem. If the include list in tsconfig.json would be the culprit, it shouldn’t work on a symlinked repo, nor on Windows.

While trying to reproduce the bug in a minimal repo, I was getting inconsistent results. Sometimes the build succeeded, sometimes it didn’t. I’d call it was quasi-random, or just I didn’t manage to catch the logic.

Could the problem be caused by ts-jest getting the list of files in a different order on Windows / Linux or from symlinked / copied modules and transforming them in different order? Could the file creation or last modification / access dates cause inconsistencies of this kind?

Debug log

Test suite failed to run

TypeError: Unable to require `.d.ts` file.
This is usually the result of a faulty configuration or import. Make sure there is a `.js`, `.json` or another executable extension available alongside `index.ts`.

> 1 | import { callA, anotherCallA } from "localLib";
    | ^
  2 | 
  3 | export function checkB(s: string) : string | null {
  4 |     const a = callA(anotherCallA(s));

  at getOutput (node_modules/ts-jest/dist/compiler.js:163:23)
  at Object.<anonymous> (src/b.ts:1:1)

Test Suites: 1 failed, 1 total

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Minimal repo

https://github.com/hernyo/ts-jest-build-error Steps to reproduce:

cd localLib
   (sudo) npm link
   
cd ../main
   npm install
   npm link localLib
   npm run clearJest
   npm test  => success
   
   (sudo) rm -rf node_modules/localLib
   cp -r ../localLib node_modules
   npm run clearJest
   npm test => failure

[marcj]

Ok, the issue goes away when you include localLib in your compilation process by adding it into tsconfig.json:

  "include": [
    "src",
    "node_modules/localLib"
  ]

So, the actual issue is the opposite, that jest allows you to compile files that they actually shouldn’t. It works with symlinks, because the resolved path is not inside node_modules so Typescript compiles it again.

[pmarrone]

We are seeing a similar issue in a lerna monorepo project (“ts-jest”: “24.1.0”) on Mac. The project is written in typescript and some of the project packages import a shared utilities library, also written in typescript The package.json goes something like this:

  "dependencies": {
    "project-utils": "file:../../../utils",
  },

Running the tests disabling the cache and using the jest configuration like this gave us the same problem:

transformIgnorePatterns: ['node_modules/(?!(project-utils)/)'],

The workaround we found was to tell jest to map the dependency module (that would be looked up in the node_modules folder of the dependent module) with the actual relative path of the source code of the dependency in our jest.config.js:

{
  ...
  moduleNameMapper: {
    'project-utils': '<rootDir>/packages/utils',
  },
  ...
}

This seems to work for us, but it still is a workaround rather than a proper solution.