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0.29.1 • Public • Published


Variant with separate .WASM file. Supports browser ESM, NodeJS ESM, and NodeJS CommonJS.

This generated package is part of quickjs-emscripten. It contains a variant of the quickjs WASM library, and can be used with quickjs-emscripten-core.

import variant from "@jitl/quickjs-wasmfile-debug-sync"
import { newQuickJSWASMModuleFromVariant } from "quickjs-emscripten-core"
const QuickJS = await newQuickJSWASMModuleFromVariant(variant)

This variant was built with the following settings:

Library: quickjs

The original bellard/quickjs library.

Version 2024-01-13+626e0d4e vendored to quickjs-emscripten on 2024-02-11.

Release mode: debug

Enables assertions and memory sanitizers. Try to run your tests against debug variants, in addition to your preferred production variant, to catch more bugs.

Exports: require import browser workerd

Exports the following in package.json for the package entrypoint:

  • Exports a NodeJS-compatible CommonJS module, which is faster to load and run compared to an ESModule.
  • Exports a NodeJS-compatible ESModule. Cannot be imported synchronously from a NodeJS CommonJS module.
  • Exports a browser-compatible ESModule, designed to work in browsers and browser-like environments.
  • Targets Cloudflare Workers.

Extra async magic? No

The default, normal build. Note that both variants support regular async functions.

Single-file, or separate .wasm file? wasm

Has a separate .wasm file. May offer better caching in your browser, and reduces the size of your JS bundle. If you have issues, try a 'singlefile' variant.

More details

Full variant JSON description:

  "library": "quickjs",
  "releaseMode": "debug",
  "syncMode": "sync",
  "description": "Variant with separate .WASM file. Supports browser ESM, NodeJS ESM, and NodeJS CommonJS.",
  "emscriptenInclusion": "wasm",
  "exports": {
    "require": {
      "emscriptenEnvironment": ["node"]
    "import": {
      "emscriptenEnvironment": ["node"]
    "browser": {
      "emscriptenEnvironment": ["web", "worker"]
    "workerd": {
      "emscriptenEnvironment": ["web"]

Variant-specific Emscripten build flags:

  "-s ASSERTIONS=1",
  "--pre-js $(TEMPLATES)/pre-extension.js",
  "--pre-js $(TEMPLATES)/pre-sourceMapJson.js",
  "--pre-js $(TEMPLATES)/pre-wasmOffsetConverter.js",
  "--pre-js $(TEMPLATES)/pre-wasmMemory.js",




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npm i @jitl/quickjs-wasmfile-debug-sync

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