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typescript and ESM support for Node.js (fork with virtualModules support)","maintainers":[{"name":"badlogic","email":"mario@badlogicgames.com"}],"readme":"# jiti\n\n<!-- automd:badges color=F0DB4F bundlephobia -->\n\n[![npm version](https://img.shields.io/npm/v/jiti?color=F0DB4F)](https://npmjs.com/package/jiti)\n[![npm downloads](https://img.shields.io/npm/dm/jiti?color=F0DB4F)](https://npmjs.com/package/jiti)\n[![bundle size](https://img.shields.io/bundlephobia/minzip/jiti?color=F0DB4F)](https://bundlephobia.com/package/jiti)\n\n<!-- /automd -->\n\n> This is the active development branch. Check out [jiti/v1](https://github.com/unjs/jiti/tree/v1) for legacy v1 docs and code.\n\n## 🌟 Used in\n\n[Docusaurus](https://docusaurus.io/), [ESLint](https://github.com/eslint/eslint), [FormKit](https://formkit.com/), [Histoire](https://histoire.dev/), [Knip](https://knip.dev/), [Nitro](https://nitro.unjs.io/), [Nuxt](https://nuxt.com/), [PostCSS loader](https://github.com/webpack-contrib/postcss-loader), [Rsbuild](https://rsbuild.dev/), [Size Limit](https://github.com/ai/size-limit), [Slidev](https://sli.dev/), [Tailwindcss](https://tailwindcss.com/), [Tokenami](https://github.com/tokenami/tokenami), [UnoCSS](https://unocss.dev/), [WXT](https://wxt.dev/), [Winglang](https://www.winglang.io/), [Graphql code generator](https://the-guild.dev/graphql/codegen), [Lingui](https://lingui.dev/), [Scaffdog](https://scaff.dog/), [Storybook](https://storybook.js.org), [...UnJS ecosystem](https://unjs.io/), [...60M+ npm monthly downloads](https://npm.chart.dev/jiti), [...6M+ public repositories](https://github.com/unjs/jiti/network/dependents).\n\n## ✅ Features\n\n- Seamless TypeScript and ESM syntax support for Node.js\n- Seamless interoperability between ESM and CommonJS\n- Asynchronous API to replace `import()`\n- Synchronous API to replace `require()` (deprecated)\n- Super slim and zero dependency\n- Custom resolve aliases\n- Smart syntax detection to avoid extra transforms\n- Node.js native `require.cache` integration\n- Filesystem transpile with hard disk caches\n- ESM Loader support\n- JSX support (opt-in)\n\n> [!IMPORTANT]\n> To enhance compatibility, jiti `>=2.1` enabled [`interopDefault`](#interopdefault) using a new Proxy method. If you migrated to `2.0.0` earlier, this might have caused behavior changes. In case of any issues during the upgrade, please [report](https://github.com/unjs/jiti/issues) so we can investigate to solve them. 🙏🏼\n\n## 💡 Usage\n\n### CLI\n\nYou can use `jiti` CLI to quickly run any script with TypeScript and native ESM support!\n\n```bash\nnpx jiti ./index.ts\n```\n\n### Programmatic\n\nInitialize a jiti instance:\n\n```js\n// ESM\nimport { createJiti } from \"jiti\";\nconst jiti = createJiti(import.meta.url);\n\n// CommonJS (deprecated)\nconst { createJiti } = require(\"jiti\");\nconst jiti = createJiti(__filename);\n```\n\nImport (async) and resolve with ESM compatibility:\n\n```js\n// jiti.import(id) is similar to import(id)\nconst mod = await jiti.import(\"./path/to/file.ts\");\n\n// jiti.esmResolve(id) is similar to import.meta.resolve(id)\nconst resolvedPath = jiti.esmResolve(\"./src\");\n```\n\nIf you need the default export of module, you can use `jiti.import(id, { default: true })` as shortcut to `mod?.default ?? mod`.\n\n```js\n// shortcut to mod?.default ?? mod\nconst modDefault = await jiti.import(\"./path/to/file.ts\", { default: true });\n```\n\nCommonJS (sync & deprecated):\n\n```js\n// jiti() is similar to require(id)\nconst mod = jiti(\"./path/to/file.ts\");\n\n// jiti.resolve() is similar to require.resolve(id)\nconst resolvedPath = jiti.resolve(\"./src\");\n```\n\nYou can also pass options as the second argument:\n\n```js\nconst jiti = createJiti(import.meta.url, { debug: true });\n```\n\n### Register global ESM loader\n\nYou can globally register jiti using [global hooks](https://nodejs.org/api/module.html#initialize). (Important: Requires Node.js > 20)\n\n```js\nimport \"jiti/register\";\n```\n\nOr:\n\n```bash\nnode --import jiti/register index.ts\n```\n\n## 🎈 `jiti/native`\n\nYou can alias `jiti` to `jiti/native` to directly depend on runtime's [`import.meta.resolve`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/import.meta/resolve) and dynamic [`import()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/import) support. This allows easing up the ecosystem transition to runtime native support by giving the same API of jiti.\n\n## ⚙️ Options\n\n### `debug`\n\n- Type: Boolean\n- Default: `false`\n- Environment variable: `JITI_DEBUG`\n\nEnable verbose logging. You can use `JITI_DEBUG=1 <your command>` to enable it.\n\n### `fsCache`\n\n- Type: Boolean | String\n- Default: `true`\n- Environment variable: `JITI_FS_CACHE`\n\nFilesystem source cache (enabled by default)\n\nBy default (when is `true`), jiti uses `node_modules/.cache/jiti` (if exists) or `{TMP_DIR}/jiti`.\n\n**Note:** It is recommended that this option be enabled for better performance.\n\n### `rebuildFsCache`\n\n- Type: Boolean\n- Default: `false`\n- Environment variable: `JITI_REBUILD_FS_CACHE`\n\nRebuild filesystem source cache created by `fsCache`.\n\n### `moduleCache`\n\n- Type: String\n- Default: `true`\n- Environment variable: `JITI_MODULE_CACHE`\n\nRuntime module cache (enabled by default).\n\nDisabling allows editing code and importing the same module multiple times.\n\nWhen enabled, jiti integrates with Node.js native CommonJS cache-store.\n\n### `transform`\n\n- Type: Function\n- Default: Babel (lazy loaded)\n\nTransform function. See [src/babel](./src/babel.ts) for more details\n\n### `sourceMaps`\n\n- Type: Boolean\n- Default `false`\n- Environment variable: `JITI_SOURCE_MAPS`\n\nAdd inline source map to transformed source for better debugging.\n\n### `interopDefault`\n\n- Type: Boolean\n- Default: `true`\n- Environment variable: `JITI_INTEROP_DEFAULT`\n\nJiti combines module exports with the `default` export using an internal Proxy to improve compatibility with mixed CJS/ESM usage. You can check the current implementation [here](https://github.com/unjs/jiti/blob/main/src/utils.ts#L105).\n\n### `alias`\n\n- Type: Object\n- Default: -\n- Environment variable: `JITI_ALIAS`\n\nYou can also pass an object to the environment variable for inline config. Example: `JITI_ALIAS='{\"~/*\": \"./src/*\"}' jiti ...`.\n\nCustom alias map used to resolve IDs.\n\n### `nativeModules`\n\n- Type: Array\n- Default: ['typescript']\n- Environment variable: `JITI_NATIVE_MODULES`\n\nList of modules (within `node_modules`) to always use native `require()` for them.\n\n### `transformModules`\n\n- Type: Array\n- Default: []\n- Environment variable: `JITI_TRANSFORM_MODULES`\n\nList of modules (within `node_modules`) to transform them regardless of syntax.\n\n### `importMeta`\n\nParent module's [`import.meta`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/import.meta) context to use for ESM resolution. (only used for `jiti/native` import).\n\n### `tryNative`\n\n- Type: Boolean\n- Default: Enabled if bun is detected\n- Environment variable: `JITI_TRY_NATIVE`\n\nTry to use native require and import without jiti transformations first.\n\n### `jsx`\n\n- Type: Boolean | {options}\n- Default: `false`\n- Environment Variable: `JITI_JSX`\n\nEnable JSX support using [`@babel/plugin-transform-react-jsx`](https://babeljs.io/docs/babel-plugin-transform-react-jsx).\n\nSee [`test/fixtures/jsx`](./test/fixtures/jsx) for framework integration examples.\n\n## Development\n\n- Clone this repository\n- Enable [Corepack](https://github.com/nodejs/corepack) using `corepack enable`\n- Install dependencies using `pnpm install`\n- Run `pnpm dev`\n- Run `pnpm jiti ./test/path/to/file.ts`\n\n## License\n\n<!-- automd:contributors license=MIT author=\"pi0\" -->\n\nPublished under the [MIT](https://github.com/unjs/jiti/blob/main/LICENSE) license.\nMade by [@pi0](https://github.com/pi0) and [community](https://github.com/unjs/jiti/graphs/contributors) 💛\n<br><br>\n<a href=\"https://github.com/unjs/jiti/graphs/contributors\">\n<img src=\"https://contrib.rocks/image?repo=unjs/jiti\" />\n</a>\n\n<!-- /automd -->\n\n<!-- automd:with-automd -->\n","readmeFilename":"README.md"}