jest.config.ts

import fs from 'node:fs';
import path from 'node:path';

import { JestConfigWithTsJest } from 'ts-jest';

// Fix some bad package.json files that don't play well with ts-jest
[
  // https://github.com/g-plane/cue/issues/1
  '@gplane/cue',
].forEach((moduleName) => {
  const modulePath = path.join('node_modules', moduleName);
  const packagePath = path.join(modulePath, 'package.json');
  const packageJson = JSON.parse(fs.readFileSync(packagePath).toString());

  packageJson.main = packageJson.main ?? packageJson.exports['.'].import;
  delete packageJson.exports;

  fs.writeFileSync(packagePath, JSON.stringify(packageJson, undefined, 2));
});

const jestConfig: JestConfigWithTsJest = {
  preset: 'ts-jest',
  testEnvironment: 'node',

  setupFilesAfterEnv: ['jest-extended/all'],

  // Most tests are I/O-bound, increase the test timeout globally
  testTimeout: 20_000,

  // BEGIN https://kulshekhar.github.io/ts-jest/docs/guides/esm-support
  extensionsToTreatAsEsm: ['.ts'],
  transform: {
    '^.+\\.tsx?$': ['ts-jest', { useESM: true }],
  },
  moduleNameMapper: {
    '^(\\.{1,2}/.*)\\.js$': '$1',
    // END https://kulshekhar.github.io/ts-jest/docs/guides/esm-support
  },

  // Don't run any compiled versions of the tests, if they exist
  modulePathIgnorePatterns: ['<rootDir>/dist/'],
  // Don't report coverage on the test directory
  coveragePathIgnorePatterns: ['<rootDir>/test/'],

  // Report coverage on all source files, because it won't by default...
  collectCoverageFrom: ['<rootDir>/src/**/*.{js,cjs,mjs,ts}'],
};

export default jestConfig;