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This is the active development branch. Check outjiti/v1 for legacy v1 docs and code.

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• Seamless TypeScript and ESM syntax support for Node.js
• Seamless interoperability between ESM and CommonJS
• Asynchronous API to replaceimport()
• Synchronous API to replacerequire() (deprecated)
• Super slim and zero dependency
• Custom resolve aliases
• Smart syntax detection to avoid extra transforms
• Node.js nativerequire.cache integration
• Filesystem transpile with hard disk caches
• ESM Loader support
• JSX support (opt-in)

You can usejiti CLI to quickly run any script with TypeScript and native ESM support!

npx jiti ./index.ts

Initialize a jiti instance:

// ESMimport{createJiti}from"jiti";constjiti=createJiti(import.meta.url);// CommonJS (deprecated)const{ createJiti}=require("jiti");constjiti=createJiti(__filename);

Import (async) and resolve with ESM compatibility:

// jiti.import(id) is similar to import(id)constmod=awaitjiti.import("./path/to/file.ts");// jiti.esmResolve(id) is similar to import.meta.resolve(id)constresolvedPath=jiti.esmResolve("./src");

If you need the default export of module, you can usejiti.import(id, { default: true }) as shortcut tomod?.default ?? mod.

// shortcut to mod?.default ?? modconstmodDefault=awaitjiti.import("./path/to/file.ts",{default:true});

CommonJS (sync & deprecated):

// jiti() is similar to require(id)constmod=jiti("./path/to/file.ts");// jiti.resolve() is similar to require.resolve(id)constresolvedPath=jiti.resolve("./src");

You can also pass options as the second argument:

constjiti=createJiti(import.meta.url,{debug:true});

You can globally register jiti usingglobal hooks. (Important: Requires Node.js > 20)

import"jiti/register";

Or:

node --import jiti/register index.ts

You can aliasjiti tojiti/native to directly depend on runtime'simport.meta.resolve and dynamicimport() support. This allows easing up the ecosystem transition to runtime native support by giving the same API of jiti.

• Type: Boolean
• Default:false
• Environment variable:JITI_DEBUG

Enable verbose logging. You can useJITI_DEBUG=1 <your command> to enable it.

• Type: Boolean | String
• Default:true
• Environment variable:JITI_FS_CACHE

Filesystem source cache (enabled by default)

By default (when istrue), jiti usesnode_modules/.cache/jiti (if exists) or{TMP_DIR}/jiti.

Note: It is recommended that this option be enabled for better performance.

• Type: Boolean
• Default:false
• Environment variable:JITI_REBUILD_FS_CACHE

Rebuild filesystem source cache created byfsCache.

• 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.

• Type: Function
• Default: Babel (lazy loaded)

Transform function. Seesrc/babel for more details

• Type: Boolean
• Defaultfalse
• Environment variable:JITI_SOURCE_MAPS

Add inline source map to transformed source for better debugging.

• Type: Boolean
• Default:true
• Environment variable:JITI_INTEROP_DEFAULT

Jiti combines module exports with thedefault export using an internal Proxy to improve compatibility with mixed CJS/ESM usage. You can check the current implementationhere.

• 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.

• Type: Array
• Default: ['typescript']
• Environment variable:JITI_NATIVE_MODULES

List of modules (withinnode_modules) to always use nativerequire() for them.

• Type: Array
• Default: []
• Environment variable:JITI_TRANSFORM_MODULES

List of modules (withinnode_modules) to transform them regardless of syntax.

Parent module'simport.meta context to use for ESM resolution. (only used forjiti/native import).

• Type: Boolean
• Default: Enabled if bun is detected
• Environment variable:JITI_TRY_NATIVE

Try to use native require and import without jiti transformations first.

• Type: Boolean | {options}
• Default:false
• Environment Variable:JITI_JSX

Enable JSX support using@babel/plugin-transform-react-jsx.

Seetest/fixtures/jsx for framework integration examples.

• Clone this repository
• EnableCorepack usingcorepack enable
• Install dependencies usingpnpm install
• Runpnpm dev
• Runpnpm jiti ./test/path/to/file.ts

Published under theMIT license.Made by@pi0 andcommunity 💛