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sebastianwessel / repository
A typescript package to execute JavaScript and TypeScript code in a webassembly quickjs sandbox
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This TypeScript package allows you to safely execute JavaScript AND TypeScript 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.
View the full documentation | Find examples in the repository | Online Playground
expect.Here's a simple example of how to use the package:
import variant from "@jitl/quickjs-ng-wasmfile-release-sync";
import { type SandboxOptions, loadQuickJs } from "@sebastianwessel/quickjs";
// General setup like loading and init of the QuickJS wasm
// It is a resource-intensive job and should be done only once if possible
const { runSandboxed } = await loadQuickJs(variant);
const options: SandboxOptions = {
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 code = `
import { join } 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()
`;
const result = await runSandboxed(
async ({ evalCode }) => evalCode(code),
options,
);
console.log(result); // { ok: true, data: '<!doctype html>\n<html>\n[....]</html>\n' }
Find examples in the repository
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.
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