Cannot generate a coverage report

[leonardparisi]

I don't know if this is an issue specifically with @swc/jest, but I tried the suggestions in this StackOverflow question and they made no difference. Here is my jest.config.js:

module.exports = {
  'roots': ['<rootDir>/../src'],
  'moduleDirectories': ['node_modules', 'src'],
  'setupFilesAfterEnv': ['<rootDir>/setup-tests.js'],
  'coverageDirectory': '<rootDir>/../coverage',
  'verbose': true,
  'collectCoverage': true,
  'transform': {
    '^.+\\.(t|j)sx?$': [
      '@swc/jest',
      {
        'jsc': {
          target: 'es2021',
        },
        'sourceMaps': true,
      },
    ],
  },
  'collectCoverageFrom': [
    '<rootDir>/../src/**.{ts,js,tsx,jsx}',
    '!**/node_modules/**',
  ],
}

My file structure looks like:

.
├── coverage
├── jest
│   ├── jest.config.js
│   ├── setup-tests.js
├── src/
├── tsconfig.json

The output looks like this:

----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
----------|---------|----------|---------|---------|-------------------
All files |       0 |        0 |       0 |       0 |                   
----------|---------|----------|---------|---------|-------------------

Test Suites: 11 passed, 11 total
Tests:       25 passed, 25 total
Snapshots:   0 total
Time:        1.307 s
Ran all test suites.

[kdy1]

I think it can be a problem of a sourcemap.

[kdy1]

I think it may work if you remove sourceMaps: true. Can you try it?

[kalvin807]

I was having a similar problem,
I think the fix is you need a collectCoverageFrom glob like this

  collectCoverageFrom: [
    "src/**/*.{ts,js,tsx,jsx}",
    "!**/node_modules/",
  ],

yours is **.{ts...} while it should be single asterisk **/*.{ts...} < recurive each folder and each file that matches the extensions list in src folder.

Or is it due to some internal difference between swc generated file and ts-jest generated file?

[kdy1]

Closing as duplicate of swc-project/swc#3854