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# jiti
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> This is the active development branch. Check out [jiti/v1](https://github.com/unjs/jiti/tree/v1) for legacy v1 docs and code.
## 🌟 Used in
[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).
## ✅ Features
- Seamless TypeScript and ESM syntax support for Node.js
- Seamless interoperability between ESM and CommonJS
- Asynchronous API to replace `import()`
- Synchronous API to replace `require()` (deprecated)
- Super slim and zero dependency
- Custom resolve aliases
- Smart syntax detection to avoid extra transforms
- Node.js native `require.cache` integration
- Filesystem transpile with hard disk caches
- ESM Loader support
- JSX support (opt-in)
> [!IMPORTANT]
> 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. 🙏🏼
## 💡 Usage
### CLI
You can use `jiti` CLI to quickly run any script with TypeScript and native ESM support!
```bash
npx jiti ./index.ts
```
### Programmatic
Initialize a jiti instance:
```js
// ESM
import { createJiti } from "jiti";
const jiti = createJiti(import.meta.url);
// CommonJS (deprecated)
const { createJiti } = require("jiti");
const jiti = createJiti(__filename);
```
Import (async) and resolve with ESM compatibility:
```js
// jiti.import(id) is similar to import(id)
const mod = await jiti.import("./path/to/file.ts");
// jiti.esmResolve(id) is similar to import.meta.resolve(id)
const resolvedPath = jiti.esmResolve("./src");
```
If you need the default export of module, you can use `jiti.import(id, { default: true })` as shortcut to `mod?.default ?? mod`.
```js
// shortcut to mod?.default ?? mod
const modDefault = await jiti.import("./path/to/file.ts", { default: true });
```
CommonJS (sync & deprecated):
```js
// jiti() is similar to require(id)
const mod = jiti("./path/to/file.ts");
// jiti.resolve() is similar to require.resolve(id)
const resolvedPath = jiti.resolve("./src");
```
You can also pass options as the second argument:
```js
const jiti = createJiti(import.meta.url, { debug: true });
```
### Register global ESM loader
You can globally register jiti using [global hooks](https://nodejs.org/api/module.html#initialize). (Important: Requires Node.js > 20)
```js
import "jiti/register";
```
Or:
```bash
node --import jiti/register index.ts
```
## 🎈 `jiti/native`
You 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.
## ⚙️ Options
### `debug`
- Type: Boolean
- Default: `false`
- Environment variable: `JITI_DEBUG`
Enable verbose logging. You can use `JITI_DEBUG=1 <your command>` to enable it.
### `fsCache`
- Type: Boolean | String
- Default: `true`
- Environment variable: `JITI_FS_CACHE`
Filesystem source cache (enabled by default)
By default (when is `true`), jiti uses `node_modules/.cache/jiti` (if exists) or `{TMP_DIR}/jiti`.
**Note:** It is recommended that this option be enabled for better performance.
### `rebuildFsCache`
- Type: Boolean
- Default: `false`
- Environment variable: `JITI_REBUILD_FS_CACHE`
Rebuild filesystem source cache created by `fsCache`.
### `moduleCache`
- Type: String
- Default: `true`
- Environment variable: `JITI_MODULE_CACHE`
Runtime module cache (enabled by default).
Disabling allows editing code and importing the same module multiple times.
When enabled, jiti integrates with Node.js native CommonJS cache-store.
### `transform`
- Type: Function
- Default: Babel (lazy loaded)
Transform function. See [src/babel](./src/babel.ts) for more details
### `sourceMaps`
- Type: Boolean
- Default `false`
- Environment variable: `JITI_SOURCE_MAPS`
Add inline source map to transformed source for better debugging.
### `interopDefault`
- Type: Boolean
- Default: `true`
- Environment variable: `JITI_INTEROP_DEFAULT`
Jiti 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).
### `alias`
- Type: Object
- Default: -
- Environment variable: `JITI_ALIAS`
You can also pass an object to the environment variable for inline config. Example: `JITI_ALIAS='{"~/*": "./src/*"}' jiti ...`.
Custom alias map used to resolve IDs.
### `nativeModules`
- Type: Array
- Default: ['typescript']
- Environment variable: `JITI_NATIVE_MODULES`
List of modules (within `node_modules`) to always use native `require()` for them.
### `transformModules`
- Type: Array
- Default: []
- Environment variable: `JITI_TRANSFORM_MODULES`
List of modules (within `node_modules`) to transform them regardless of syntax.
### `importMeta`
Parent 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).
### `tryNative`
- Type: Boolean
- Default: Enabled if bun is detected
- Environment variable: `JITI_TRY_NATIVE`
Try to use native require and import without jiti transformations first.
### `jsx`
- Type: Boolean | {options}
- Default: `false`
- Environment Variable: `JITI_JSX`
Enable JSX support using [`@babel/plugin-transform-react-jsx`](https://babeljs.io/docs/babel-plugin-transform-react-jsx).
See [`test/fixtures/jsx`](./test/fixtures/jsx) for framework integration examples.
## Development
- Clone this repository
- Enable [Corepack](https://github.com/nodejs/corepack) using `corepack enable`
- Install dependencies using `pnpm install`
- Run `pnpm dev`
- Run `pnpm jiti ./test/path/to/file.ts`
## License
<!-- automd:contributors license=MIT author="pi0" -->
Published under the [MIT](https://github.com/unjs/jiti/blob/main/LICENSE) license.
Made by [@pi0](https://github.com/pi0) and [community](https://github.com/unjs/jiti/graphs/contributors) 💛
<br><br>
<a href="https://github.com/unjs/jiti/graphs/contributors">
<img src="https://contrib.rocks/image?repo=unjs/jiti" />
</a>
<!-- /automd -->
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