jest.config.ts

import type { JestConfigWithTsJest } from 'ts-jest'

const config: JestConfigWithTsJest = {
  preset: 'ts-jest',
  testEnvironment: 'node',
  testMatch: ['**/test/**/*.spec.ts'],
  collectCoverageFrom: [
    '<rootDir>/src/**/*.ts',
    '!<rootDir>/src/types/**/*.ts',
  ],
  extensionsToTreatAsEsm: ['.ts'],
  moduleNameMapper: {
    '^(\\.{1,2}/.*)\\.js$': '$1',
  },
  transform: {
    // '^.+\\.[tj]sx?$' to process ts,js,tsx,jsx with `ts-jest`
    // '^.+\\.m?[tj]sx?$' to process ts,js,tsx,jsx,mts,mjs,mtsx,mjsx with `ts-jest`
    '^.+\\.tsx?$': [
      'ts-jest',
      {
        useESM: true,
        diagnostics: false,
        isolatedModules: true,
      },
    ],
  },
};

export default config;