# Is @protobufjs/aspromise ESM-only? Can you require() it?

> @protobufjs/aspromise@1.1.2 is a CommonJS package. CommonJS — require() works on every Node.js version we test.

Returns a promise from a node-style callback function.

Last verified Sep 9, 2026 against @protobufjs/aspromise@1.1.2.

@protobufjs/aspromise ships CommonJS only. require("@protobufjs/aspromise") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@protobufjs/aspromise" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

## What to do

1. require("@protobufjs/aspromise") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun.
2. From ES modules use the default import: import aspromise from "@protobufjs/aspromise"; then destructure. Named imports only work when Node.js can statically detect the exports.
3. TypeScript: types are bundled; install nothing extra.

## Facts

- Latest: 1.1.2 (Apr 24, 2017)
- Module format: CommonJS
- Last CommonJS version: 1.1.2
- TypeScript types: bundled
- Node engines: not declared
- Weekly downloads: 55.0M
- License: BSD-3-Clause

## Runtime test results for @protobufjs/aspromise@1.1.2

Installed and executed on Sep 9, 2026 with require("@protobufjs/aspromise") from a CommonJS file and import "@protobufjs/aspromise" from an ES module.

| Runtime | require("@protobufjs/aspromise") | import "@protobufjs/aspromise" |
|---|---|---|
| Node.js 18 | works | works |
| Node.js 20 | works | works |
| Node.js 22 | works | works |
| Node.js 24 | works | works |
| Node.js 26 | works | works |
| Bun 1.4.0 | works | works |

## How to import @protobufjs/aspromise

ES modules:

```js
import aspromise from "@protobufjs/aspromise";
```

CommonJS:

```js
const aspromise = require("@protobufjs/aspromise");
```

## Module format by version

Derived from the type, main and exports fields of every stable release on npm (7 versions; the newest 7 shown).

| Versions | Format | First published |
|---|---|---|
| 1.0.2 – 1.1.2 | CommonJS | Dec 12, 2016 |

## Frequently asked

**Is @protobufjs/aspromise ESM-only?**

@protobufjs/aspromise@1.1.2 is a CommonJS package. @protobufjs/aspromise ships CommonJS only. require("@protobufjs/aspromise") works on every Node.js version we test (18, 20, 22, 24 and 26) and in Bun. import "@protobufjs/aspromise" also works because Node.js and Bun can import CommonJS from ES modules, but only the default export is guaranteed; named imports depend on Node's static analysis of the module.

**Can I import @protobufjs/aspromise with ES module syntax?**

Yes. import aspromise from "@protobufjs/aspromise" works in Node.js and Bun because they support importing CommonJS modules. Named imports work only when Node.js can statically detect the exports.

**Does @protobufjs/aspromise work in Bun?**

Yes. import "@protobufjs/aspromise" loaded successfully in Bun 1.4.0 on Sep 9, 2026.

**Does @protobufjs/aspromise ship TypeScript types?**

Yes. @protobufjs/aspromise bundles its own type declarations; no @types package is needed.

## Links

- [@protobufjs/aspromise on npm](https://www.npmjs.com/package/@protobufjs/aspromise)
- [Source repository](https://github.com/dcodeIO/protobuf.js)
- [HTML version](https://canirequire.com/package/@protobufjs/aspromise/)
- [JSON version](https://canirequire.com/package/@protobufjs/aspromise.json)

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