Runner is not a constructor

[Emobe]

I get complaints that the runner is not a constructor when trying to use this library in a couple of projects.

Here is my config in one of my projects

import type { Config } from 'jest';

export default async (): Promise<Config> => ({
  verbose: true,
  runner: "@kayahr/jest-electron-runner",
  testEnvironment: "@kayahr/jest-electron-runner/environment",
  preset: 'ts-jest/presets/default-esm',
  transform: {
    '^.+\\.m?[tj]s?$': ['ts-jest', { useESM: true }],
  },
  moduleNameMapper: {
    '^(\\.{1,2}/.*)\\.(m)?js$': '$1',
  },
  testRegex: '(/tests/.*|(\\.|/)(test|spec))\\.(m)?ts$',
  coverageDirectory: 'coverage',
  collectCoverageFrom: [
    'src/**/*.ts',
    'src/**/*.mts',
    '!src/**/*.d.ts',
    '!src/**/*.d.mts',
  ],
});

The other project this happens in does not use ESM and still gets an issue of no constructor

[Emobe]

Also I get this error sometimes.

Error: Cannot find module 'node:fs'
Require stack:
- /home/emobe/projects/pixijs/node_modules/@kayahr/jest-electron-runner/lib/main/electron/runTest.js
- /home/emobe/projects/pixijs/node_modules/@kayahr/jest-electron-runner/lib/main/electron/rpc/JestWorkerRPC.js
- /home/emobe/projects/pixijs/node_modules/@kayahr/jest-electron-runner/lib/main/electron/electron_process_injected_code.js
- /home/emobe/projects/pixijs/node_modules/electron/dist/resources/default_app.asar/main.js
- 
    at Module._resolveFilename (internal/modules/cjs/loader.js:887:15)
    at Function.n._resolveFilename (electron/js2c/browser_init.js:261:1128)
    at Module._load (internal/modules/cjs/loader.js:732:27)
    at Function.f._load (electron/js2c/asar_bundle.js:5:12684)
    at Module.require (internal/modules/cjs/loader.js:959:19)
    at require (internal/modules/cjs/helpers.js:88:18)

[kayahr]

Please do not report different problems in the same issue. I moved the second problem to #13

[kayahr]

@Emobe Can you please create a minimal but complete example project on Github with a simple unit test that does nothing so I can reproduce the problem by running npm test or something similiar? Looks like you are using ts-jest and maybe you are using even more esoteric stuff which may conflict with jest-electron-runner. Maybe with a complete project to reproduce the problem I can find a solution. or at least identify which part is responsible for the problem.

The complete error message with stack trace would also be useful.

[unional]

I'm suspecting this is related to CJS vs ESM.

I'm getting this error in my project:

        TypeError: (0 , json_bigint_1.default) is not a function                                                        
                                                                                                                        
          1 | import JSONbig from 'json-bigint'                                                                         
          2 |                                                                                                           
        > 3 | export const json = JSONbig({ useNativeBigInt: true })

When I look at the trace, it is loading the cjs version of the code (e.g. ./cjs/json.js) instead of the ESM version which I configure ts-jest to use.

The difference here is about esModuleInterop, which for the ESM code, that flag is off, while for CJS code, that flag needs to be on.

Once I change the ts-jest to load a config with esModuleInterop: true, the test goes through.

At this point, I don't know where the problem is. The same tests runs fine in Node.js and jsdom.