jest.config.ts

import type { Config } from "@jest/types"
import tsConfig from './tsconfig.json'
const paths = tsConfig.compilerOptions.paths

const aliasPattern = /^(@.*)\/\*$/
const sourcePattern = /^(.*)\/\*$/

const moduleNameMapper: { [key: string]: string } = {}

Object.entries(paths).forEach(([alias, sourceArr]) => {
  if (!aliasPattern.test(alias)) {
    return
  }
  if (sourceArr.length !== 1 || !sourcePattern.test(sourceArr[0])) {
    return
  }
  const prefix = alias.match(aliasPattern)[1]
  const pattern = `^${prefix}/(.*)$`
  const source = sourceArr[0].match(sourcePattern)[1]
  const sourcePath = `<rootDir>/${source}/$1`
  moduleNameMapper[pattern] = sourcePath
})

console.log("The moduleNameMapper parsed from tsconfig.json: ")
console.log(moduleNameMapper)

const config: Config.InitialOptions = {
  moduleNameMapper,
  roots: [
    "<rootDir>/test"
  ],
  testRegex: 'test/(.+)\\.test\\.(jsx?|tsx?)$',
  transform: {
    "^.+\\.tsx?$": "ts-jest"
  },
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node']
}

export default config