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MIT License
Copyright © 2025 Borewit
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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[![Node.js CI](https://github.com/Borewit/load-esm/actions/workflows/nodejs-ci.yml/badge.svg)](https://github.com/Borewit/load-esm/actions/workflows/nodejs-ci.yml)
[![NPM version](https://img.shields.io/npm/v/load-esm.svg)](https://npmjs.org/package/load-esm)
[![npm downloads](http://img.shields.io/npm/dm/load-esm.svg)](https://npmcharts.com/compare/load-esm?start=365)
# load-esm
**load-esm** is a tiny utility that lets CommonJS (CJS) TypeScript projects **dynamically import pure ESM packages** at runtime—without hacks like `eval()`.
It helps avoid errors like:
* `Error [ERR_REQUIRE_ESM]: require() of ES Module`
* `Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: No "exports" main defined in ...`
---
## Installation
```bash
npm install load-esm
# or
yarn add load-esm
# or
pnpm add load-esm
```
> Works in CJS TypeScript projects. No config changes required.
---
## Quick start
```ts
// TypeScript (CJS project)
import { loadEsm } from "load-esm";
(async () => {
const esmModule = await loadEsm("esm-module");
// use esmModule...
})();
```
### With typings
```ts
import { loadEsm } from "load-esm";
(async () => {
const esmModule = await loadEsm<typeof import("esm-module")>("esm-module");
// esmModule is fully typed
})();
```
### Concrete example (pure ESM package)
```ts
import { loadEsm } from "load-esm";
(async () => {
try {
// Import a pure ESM package from a CommonJS TS project
const { fileTypeFromFile } = await loadEsm<typeof import("file-type")>(
"file-type"
);
const type = await fileTypeFromFile("fixture.gif");
console.log(type);
} catch (error) {
console.error("Error importing module:", error);
}
})();
```
> Note: Because toplevel `await` isnt available in CommonJS, examples use an async IIFE.
---
## API
```ts
function loadEsm<T = unknown>(name: string): Promise<T>
```
**Parameters**
* `name` — Package name or file path to import.
**Returns**
* `Promise<T>` resolving to the imported module namespace.
---
## How it works
In CJS TypeScript projects (`"module": "commonjs"`), the TS compiler transpiles dynamic `import()` to `require()`, which **breaks** when the target is a pure ESM package.
`load-esm` executes the `import()` **outside of TypeScripts transpilation scope**, preserving native dynamic `import()` semantics at runtime. This keeps your code typesafe while avoiding brittle workarounds (e.g., wrapping `import()` in `eval()`).
### What about Node.js ≥ 22.12?
Since Node.js 22.12, `require` can load **some** ESM modules, but there are [documented constraints](https://nodejs.org/api/modules.html#loading-ecmascript-modules-using-require). If your dependencies are compatible with that path, you might not need this utility. `load-esm` remains useful when:
* Youre on older Node.js versions that support `import()` (see Compatibility) but not the newer `require()` behavior.
* You want a single, consistent pattern that works across environments and avoids edge cases.
> If Nodes builtin `require(esm)` works for your packages and version, feel free to use it.
---
## Compatibility
* **Node.js**: ≥ 13.2.0 (first version with native `import()` support)
* **TypeScript**: Fully typed; works in CJS projects.
---
## Troubleshooting
* **`ERR_REQUIRE_ESM`**: Ensure youre using `load-esm(...)` to import the ESM dependency from CJS code.
* **`No "exports" main defined`**: Some packages only expose ESM entry points. Import them via `load-esm`.
* **Type declarations**: Use the generic form `loadEsm<typeof import("pkg")>("pkg")` for typed access.
* **Toplevel await**: Wrap usage in an async IIFE in CJS.
---
## License
[MIT](./LICENSE.txt)
---
### Changelog
See [Releases](https://github.com/Borewit/load-esm/releases).
---
### Acknowledgements
Inspired by common pain points when mixing CJS projects with modern ESMonly libraries.

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export function loadEsm<T = any>(name: string): Promise<T>;

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module.exports = {
loadEsm: (module) => import(module)
};

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{
"name": "load-esm",
"version": "1.0.3",
"type": "commonjs",
"main": "index.js",
"types": "index.d.ts",
"scripts": {
"test": "mocha",
"compile-test": "tsc -p test"
},
"files": [
"index.js",
"index.d.ts"
],
"author": {
"name": "Borewit",
"url": "https://github.com/Borewit"
},
"funding": [
{
"type": "github",
"url": "https://github.com/sponsors/Borewit"
},
{
"type": "buymeacoffee",
"url": "https://buymeacoffee.com/borewit"
}
],
"license": "MIT",
"description": "Utility to dynamically load ESM modules in TypeScript CommonJS projects",
"repository": {
"type": "git",
"url": "git+https://github.com/Borewit/load-esm.git"
},
"bugs": {
"url": "https://github.com/Borewit/load-esm/issues"
},
"homepage": "https://github.com/Borewit/load-esm#readme",
"keywords": [
"load-esm",
"ESM",
"Import ESM",
"CJS",
"CommonJS",
"TypeScript",
"Node.js",
"dynamic import",
"dynamic module loading",
"dynamic load",
"JavaScript modules",
"CJS ESM interoperability",
"import ESM in CommonJS",
"typescript commonjs import esm",
"module interoperability",
"node esm loader",
"mixed module",
"dynamic esm import typescript",
"cjs to esm bridge",
"ERR_REQUIRE_ESM",
"require ESM error",
"ERR_PACKAGE_PATH_NOT_EXPORTED",
"No \"exports\" main defined in",
"exports not defined error"
],
"engines": {
"node": ">=13.2.0"
},
"devDependencies": {
"@types/chai": "^5.0.1",
"@types/mocha": "^10.0.10",
"@types/node": "^22.10.2",
"chai": "^4.3.4",
"mocha": "^11.0.1",
"typescript": "^5.7.2"
}
}