jest.config.ts

import { pathsToModuleNameMapper } from 'ts-jest'
import type { JestConfigWithTsJest } from 'ts-jest'
import tsConfig from './tsconfig.json'

const {
  compilerOptions: { paths },
} = tsConfig

const opts: JestConfigWithTsJest = {
  clearMocks: true,
  cacheDirectory: '<rootDir>/.jestcache',
  preset: 'ts-jest',
  rootDir: './',
  testEnvironment: 'node',
  extensionsToTreatAsEsm: ['.ts'],
  transform: {
    '^.+\\.ts$': [
      'ts-jest',
      {
        tsconfig: '<rootDir>/tsconfig.json',
        diagnostics: true,
        isolatedModules: true,
        useESM: true,
      },
    ],
  },
  modulePaths: ['<rootDir>'],
  moduleNameMapper: pathsToModuleNameMapper(paths, { prefix: '<rootDir>' }),
  moduleFileExtensions: ['ts', 'js'],
  setupFilesAfterEnv: ['<rootDir>/jest.setup.ts'],
  verbose: true,
}

export default opts