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@tootallnate/quickjs-emscripten

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@tootallnate/quickjs-emscripten

Javascript/Typescript bindings for QuickJS, a modern Javascript interpreter, compiled to WebAssembly.

  • 0.23.0
  • unpublished
  • latest
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  • npm
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7.7M
increased by11.47%
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What is @tootallnate/quickjs-emscripten?

The @tootallnate/quickjs-emscripten package allows you to run a QuickJS JavaScript engine in a web browser or Node.js environment using Emscripten-compiled WebAssembly. This enables you to execute JavaScript code within a separate QuickJS virtual machine, providing a sandboxed environment for running scripts.

What are @tootallnate/quickjs-emscripten's main functionalities?

Evaluating JavaScript code

This feature allows you to evaluate arbitrary JavaScript code within the QuickJS virtual machine. The code sample demonstrates how to create a new QuickJS VM, evaluate a simple expression, and log the result.

const { getQuickJS } = require('@tootallnate/quickjs-emscripten');

async function main() {
  const QuickJS = await getQuickJS();
  const vm = QuickJS.createVm();

  const result = vm.evalCode('1 + 1');
  console.log(result.value); // 2

  vm.dispose();
}

main();

Compiling JavaScript code to bytecode

This feature allows you to compile JavaScript code to bytecode and then execute it within the QuickJS VM. The code sample shows how to compile a script and then evaluate the compiled bytecode.

const { getQuickJS } = require('@tootallnate/quickjs-emscripten');

async function main() {
  const QuickJS = await getQuickJS();
  const vm = QuickJS.createVm();

  const { bytecode } = vm.compileCode('console.log("Hello, World!")');
  vm.evalBinary(bytecode);

  vm.dispose();
}

main();

Marshalling values between JS and QuickJS

This feature allows you to marshal values between the native JavaScript environment and the QuickJS VM. The code sample demonstrates creating a new object in QuickJS from a JavaScript object and then dumping it back to a JavaScript value.

const { getQuickJS } = require('@tootallnate/quickjs-emscripten');

async function main() {
  const QuickJS = await getQuickJS();
  const vm = QuickJS.createVm();

  const jsValue = { hello: 'world' };
  const quickjsValue = vm.newObject(jsValue);

  const result = vm.dump(quickjsValue);
  console.log(result); // { hello: 'world' }

  vm.dispose();
}

main();

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Package last updated on 18 Jul 2023

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