This TypeScript package allows you to safely execute JavaScript code within a WebAssembly sandbox using the QuickJS engine. Perfect for isolating and running untrusted code securely, it leverages the lightweight and fast QuickJS engine compiled to WebAssembly, providing a robust environment for code execution.
- Security: Run untrusted JavaScript code in a safe, isolated environment.
- File System: Can mount a virtual file system
- Custom Node Modules: Custom node modules are mountable
- Fetch Client: Can provide a fetch client to make http(s) calls
- Test-Runner: Includes a test runner and chai based
expect - Performance: Benefit from the lightweight and efficient QuickJS engine.
- Versatility: Easily integrate with existing TypeScript projects.
- Simplicity: User-friendly API for executing and managing JavaScript code in the sandbox.
Find examples in the repository
Here's a simple example of how to use the package:
import { quickJS } from '@sebastianwessel/quickjs'
// General setup like loading and init of the QuickJS wasm
// It is a ressource intensive job and should be done only once if possible
const { createRuntime } = await quickJS()
// Create a runtime instance each time a js code should be executed
const { evalCode } = await createRuntime({
allowFetch: true, // inject fetch and allow the code to fetch data
allowFs: true, // mount a virtual file system and provide node:fs module
env: {
MY_ENV_VAR: 'env var value'
},
})
const result = await evalCode(`
import { join } as path from 'path'
const fn = async ()=>{
console.log(join('src','dist')) // logs "src/dist" on host system
console.log(env.MY_ENV_VAR) // logs "env var value" on host system
const url = new URL('https://example.com')
const f = await fetch(url)
return f.text()
}
export default await fn()
`)
console.log(result) // { ok: true, data: '<!doctype html>\n<html>\n[....]</html>\n' }This lib is based on:
Tools used:
This project is licensed under the MIT License.
This package is ideal for developers looking to execute JavaScript code securely within a TypeScript application, ensuring both performance and safety with the QuickJS WebAssembly sandbox.