[Bug]: Enum with path alias throws error: Could not locate module @foo/bar mapped as

Version

27.0.7

Steps to reproduce

1. Clone this repo: https://github.com/xyxc0673/test-ts-jest
2. yarn
3. yarn test

Expected behavior

all tests pass

Actual behavior

    Configuration error:
    
    Could not locate module @foo/bar mapped as:
    /Users/carl/workspace/tests/ts-jest/examples/react/foo/$1.
    
    Please check your configuration for these entries:
    {
      "moduleNameMapper": {
        "/^@foo\/(.*)$/": "/Users/carl/workspace/tests/ts-jest/examples/react/foo/$1"
      },
      "resolver": undefined
    }

    > 1 | import { BarInterface, BarEnum } from "@foo/bar"
        | ^
      2 |
      3 | export const testEnum = () => {
      4 |     const a: BarInterface = {

      at createNoMappedModuleFoundError (node_modules/.pnpm/jest-resolve@27.4.2/node_modules/jest-resolve/build/resolver.js:579:17)
      at Object.<anonymous> (src/test.ts:1:1)

Debug log

{"context":{"logLevel":20,"namespace":"Importer","package":"ts-jest","version":"27.0.7"},"message":"creating Importer singleton","sequence":1,"time":"2021-12-01T03:17:34.745Z"}
{"context":{"actualVersion":"27.4.2","expectedVersion":">=27.0.0 <28","logLevel":20,"namespace":"versions","package":"ts-jest","version":"27.0.7"},"message":"checking version of jest: OK","sequence":2,"time":"2021-12-01T03:17:34.751Z"}
{"context":{"logLevel":20,"namespace":"ts-jest-transformer","package":"ts-jest","version":"27.0.7"},"message":"created new transformer","sequence":3,"time":"2021-12-01T03:17:34.751Z"}
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Additional context

No response

Environment

System:
    OS: macOS 12.0.1
    CPU: (10) arm64 Apple M1 Pro
  Binaries:
    Node: 16.13.0 - ~/.nvm/versions/node/v16.13.0/bin/node
    Yarn: 1.22.17 - /opt/homebrew/bin/yarn
    npm: 8.1.0 - ~/.nvm/versions/node/v16.13.0/bin/npm
  npmPackages:
    jest: ^27.3.1 => 27.4.2

[ahnpnl]

Hi, I found your problem. The problem was actually informed by Jest that it cannot map the correct path.

As you can see the error message is

Please check your configuration for these entries:
    {
      "moduleNameMapper": {
        "/^@foo\/(.*)$/": "/Users/carl/workspace/tests/ts-jest/examples/react/foo/$1"
      },
      "resolver": undefined
}

the path /Users/carl/workspace/tests/ts-jest/examples/react/foo/$1 isn’t correct, it misses the src

Therefore, you need to change your config to

// jest.config.js
module.exports = {
   //...
   moduleNameMapper: {
      '^react-native$': 'react-native-web',
      '^.+\\.module\\.(css|sass|scss)$': 'identity-obj-proxy',
       ...pathsToModuleNameMapper(compilerOptions.paths, {
        prefix: '<rootDir>/src',
    }),
   }
}

When compiling, TypeScript strips away the interfaces or type aliases. However, enum is not the case as TypeScript will try to resolve that enum first before attempting to compile to js, therefore you get the error.

This is not an issue of ts-jest so i will close the issue.

[xyxc0673]

It is not the case. I use the example from the repo and forget to delete the original code.