[25.3.1]: "Emit skipped" Error

[le0nik]

Tests fail with "Emit skipped" error when in Progam mode and "Emit skipped for language service" in LanguageService mode.

Works correctly with 23.2.1.

 FAIL  src/__tests__/Tree.test.tsx
  ● Test suite failed to run

    TypeError: src/testing/mocks/loadershim.js: Emit skipped

      at compileFn (node_modules/ts-jest/dist/compiler/program.js:137:23)
      at Object.compile (node_modules/ts-jest/dist/compiler/instance.js:90:25)
      at TsJestTransformer.process (node_modules/ts-jest/dist/ts-jest-transformer.js:94:41)
      at ScriptTransformer.transformSource (node_modules/@jest/transform/build/ScriptTransformer.js:446:35)
      at ScriptTransformer._transformAndBuildScript (node_modules/@jest/transform/build/ScriptTransformer.js:525:40)
      at ScriptTransformer.transform (node_modules/@jest/transform/build/ScriptTransformer.js:563:25)

src/testing/mocks/loadershim.js

global.___loader = {
  enqueue: jest.fn(),
};

jest.config.js

module.exports = {
  preset: 'ts-jest/presets/js-with-ts',
  transform: {},
  testEnvironment: 'jsdom',
  setupFiles: [
    '<rootDir>/src/testing/mocks/loadershim.js',
    '<rootDir>/src/testing/mocks/react-transition-group-mock.js',
  ],
  setupFilesAfterEnv: ['<rootDir>/src/testing/setup.ts'],
  roots: ['<rootDir>/src/'],
  moduleNameMapper: {
    '.+\\.(css|styl|less|sass|scss)$': 'identity-obj-proxy',
    '.+\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$':
      '<rootDir>/src/testing/mocks/file-mock.js',
  },
  testPathIgnorePatterns: ['node_modules', '.cache'],
  transformIgnorePatterns: ['node_modules/(?!(gatsby)/)'],
  globals: {
    __PATH_PREFIX__: '',
    'ts-jest': {
      babelConfig: true,
      tsConfig: 'tsconfig.json',
      isolatedModules: false,
      compilerHost: true,
      incremental: true,
    },
  },
};

tsconfig.json

{
  "compilerOptions": {
    "baseUrl": ".",
    "lib": ["esnext", "dom"],
    "target": "esnext",
    "module": "esnext",
    "moduleResolution": "node",
    "noEmit": true,
    "strict": true,
    "allowSyntheticDefaultImports": true,
    "isolatedModules": true,
    "allowJs": true,
    "esModuleInterop": true,
    "disableSizeLimit": true,
    "jsx": "preserve"
  },
  "include": ["."],
  "exclude": ["node_modules", "public", ".cache", "data", "static"]
}

deps:

"ts-jest": "25.3.1",
"typescript": "3.8.3"
"jest": "25.2.7",
"@babel/core": "7.9.0"

[ahnpnl]

Hi, thank you for submitting the issue. You can try to set outDir in your tsconfig. We suspected that allowJs: true requires outDir to be set in tsconfig.

[le0nik]

Hi, thank you for suggesting this workaround. Adding outDir to tsconfig.json worked.

[yoursunny]

I encountered this Emit skipped for language service error.
In my case, the cause is: tsconfig.json compilerOptions.types contains a non-existent package.
Deleting that package name and ts-jest is working again.
FYI

[jngk2]

Similar to the above, I was missing @types/ts-jest

[mlg87]

Similar to the above, I was missing @types/ts-jest

@jngk2 is that the correct pkg name? i dont see ts-jest in definitelyTyped

[olingern]

I also ran into this. Removing noEmitError in tsconfig.json fixed this for me.

[BabkinAleksandr]

Also faced it. But I accidently had multiple index files: index.ts and index.tsx and it's suddenly resulted in this error

Hope it'll help somebody

[BorntraegerMarc]

I solve this issue by simply deleting my whole git project and re-cloning it 😕

[narthur]

Restarting my jest test watcher fixed the issue for me.

[johan]

Another solution for projects where you are using both js and ts in your tests, and had this working in typescript 4.0 with the js-with-ts preset, where you probably ought to have set that up with babel instead, to get it running with typescript 4.2:

-const tsjest = require("ts-jest/presets/js-with-ts/jest-preset");
+const tsjest = require("ts-jest/presets/js-with-babel/jest-preset");

[Elias-Graf]

Also faced it. But I accidently had multiple index files: index.ts and index.tsx and it's suddenly resulted in this error

Hope it'll help somebody

This doens't just apply to index files, it applies to all files. I had a useChanger.tsx and a useChanger.ts and the error occurred.

Horrible error message btw, I'm sure that could be improved.

[16oh4]

I encountered this Emit skipped for language service error. In my case, the cause is: tsconfig.json compilerOptions.types contains a non-existent package. Deleting that package name and ts-jest is working again. FYI

Also ran into this issue. Does tsc have a compile-time error for this, or is ts-jest merely "masking" the error?

@ahnpnl is there a way we can always see the output of tsc without being masked by ts-jest (if that is the case for some errors)?

Seems like the types error reporting could be better handled (either in ts-jest or tsc)