/** @type {import('ts-jest').JestConfigWithTsJest} */
export default {
  preset: 'ts-jest',
  testEnvironment: 'node',
  testMatch: ['**/*.test.ts'],
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx'],
  moduleNameMapper: {
    // Resolve .js imports to .ts source files (ESM convention in TS source)
    '^(.+)\\.js$': ['$1.ts', '$1.tsx', '$1.js'],
    // github-slugger v2 is ESM-only; jest's CJS runtime cannot require it.
    '^github-slugger$': '<rootDir>/__mocks__/github-slugger.js',
    // Same for the browser ESM build of csv-parse — map to the CJS build.
    '^csv-parse/browser/esm/sync$': 'csv-parse/sync',
  },
  transform: {
    '^.+\\.tsx?$': [
      'ts-jest',
      {
        tsconfig: {
          target: 'ES2020',
          module: 'ESNext',
          moduleResolution: 'node',
          esModuleInterop: true,
          strict: true,
          skipLibCheck: true
        }
      }
    ]
  }
};