134 lines
4.6 KiB
TypeScript
134 lines
4.6 KiB
TypeScript
import { loadEnvConfig } from '@next/env'
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import { resolve, join } from 'path'
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import loadConfig from '../../server/config'
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import { PHASE_TEST } from '../../shared/lib/constants'
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// import loadJsConfig from '../load-jsconfig'
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import * as Log from '../output/log'
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async function getConfig(dir: string) {
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const conf = await loadConfig(PHASE_TEST, dir)
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return conf
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}
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/**
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* Loads closest package.json in the directory hierarchy
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*/
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function loadClosestPackageJson(dir: string, attempts = 1): any {
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if (attempts > 5) {
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throw new Error("Can't resolve main package.json file")
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}
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var mainPath = attempts === 1 ? './' : Array(attempts).join('../')
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try {
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return require(join(dir, mainPath + 'package.json'))
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} catch (e) {
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return loadClosestPackageJson(dir, attempts + 1)
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}
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}
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console.warn(
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'"next/jest" is currently experimental. https://nextjs.org/docs/messages/experimental-jest-transformer'
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)
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/*
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// Usage in jest.config.js
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const nextJest = require('next/jest');
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// Optionally provide path to Next.js app which will enable loading next.config.js and .env files
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const createJestConfig = nextJest({ dir })
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// Any custom config you want to pass to Jest
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const customJestConfig = {
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setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
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}
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// createJestConfig is exported in this way to ensure that next/jest can load the Next.js config which is async
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module.exports = createJestConfig(customJestConfig)
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*/
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export default function nextJest(options: { dir?: string } = {}) {
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// createJestConfig
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return (customJestConfig: any) => {
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// Function that is provided as the module.exports of jest.config.js
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// Will be called and awaited by Jest
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return async () => {
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let nextConfig
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let paths
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let resolvedBaseUrl
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let isEsmProject = false
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if (options.dir) {
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const resolvedDir = resolve(options.dir)
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const packageConfig = loadClosestPackageJson(resolvedDir)
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isEsmProject = packageConfig.type === 'module'
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nextConfig = await getConfig(resolvedDir)
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loadEnvConfig(resolvedDir, false, Log)
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// TODO: revisit when bug in SWC is fixed that strips `.css`
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// const result = await loadJsConfig(resolvedDir, nextConfig)
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// paths = result?.jsConfig?.compilerOptions?.paths
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// resolvedBaseUrl = result.resolvedBaseUrl
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}
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// Ensure provided async config is supported
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const resolvedJestConfig =
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typeof customJestConfig === 'function'
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? await customJestConfig()
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: customJestConfig
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return {
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...resolvedJestConfig,
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moduleNameMapper: {
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// Handle CSS imports (with CSS modules)
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// https://jestjs.io/docs/webpack#mocking-css-modules
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'^.+\\.module\\.(css|sass|scss)$':
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require.resolve('./object-proxy.js'),
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// Handle CSS imports (without CSS modules)
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'^.+\\.(css|sass|scss)$': require.resolve('./__mocks__/styleMock.js'),
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// Handle image imports
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'^.+\\.(jpg|jpeg|png|gif|webp|avif|svg)$': require.resolve(
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`./__mocks__/fileMock.js`
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),
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// Custom config will be able to override the default mappings
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...(resolvedJestConfig.moduleNameMapper || {}),
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},
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testPathIgnorePatterns: [
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// Don't look for tests in node_modules
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'/node_modules/',
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// Don't look for tests in the the Next.js build output
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'/.next/',
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// Custom config can append to testPathIgnorePatterns but not modify it
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// This is to ensure `.next` and `node_modules` are always excluded
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...(resolvedJestConfig.testPathIgnorePatterns || []),
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],
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transform: {
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// Use SWC to compile tests
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'^.+\\.(js|jsx|ts|tsx)$': [
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require.resolve('../swc/jest-transformer'),
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{
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styledComponents:
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nextConfig && nextConfig.experimental.styledComponents,
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paths,
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resolvedBaseUrl: resolvedBaseUrl,
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isEsmProject,
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},
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],
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// Allow for appending/overriding the default transforms
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...(resolvedJestConfig.transform || {}),
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},
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transformIgnorePatterns: [
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// To match Next.js behavior node_modules is not transformed
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'/node_modules/',
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// CSS modules are mocked so they don't need to be transformed
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'^.+\\.module\\.(css|sass|scss)$',
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// Custom config can append to transformIgnorePatterns but not modify it
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// This is to ensure `node_modules` and .module.css/sass/scss are always excluded
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...(resolvedJestConfig.transformIgnorePatterns || []),
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],
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}
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}
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}
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}
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