jest.config.js

const { createDefaultPreset } = require("ts-jest");

const tsJestTransformCfg = createDefaultPreset().transform;

/** @type {import("jest").Config} **/
module.exports = {
  testEnvironment: "node",
  transform: {
    ...tsJestTransformCfg,
  },
};
const nextJest = require('next/jest')

const createJestConfig = nextJest({
  dir: './',
})

const customJestConfig = {
  setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
  testEnvironment: 'jest-environment-jsdom',
  transform: {
    '^.+\\.(js|jsx|ts|tsx)$': ['babel-jest', { presets: ['next/babel'] }],
  },
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx'],
  testMatch: [
    '**/__tests__/**/*.(ts|tsx|js)',
    '**/*.(test|spec).(ts|tsx|js)'
  ],
  moduleNameMapper: {
    '^@/(.*)$': '<rootDir>/src/$1',
  },
  collectCoverageFrom: [
    'src/**/*.{js,jsx,ts,tsx}',
    '!src/**/*.d.ts',
  ],
}

module.exports = createJestConfig(customJestConfig)