Node.js API compatibility - VM

Explore the integration and application of the Node.js VM module within the Azion Runtime. The VM module provides utilities to run JavaScript code in a virtualized environment, offering a level of isolation from the main application.

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The vm module in Node.js provides a way to execute JavaScript code within a virtual machine context. This allows developers to run code in a sandboxed environment, which can be useful for various applications, such as executing user-generated code, testing, or isolating code execution from the main application. This module is available in the Azion Runtime through Node.js compatibility, where a common use case is evaluating dynamic snippets or templates inside a function while keeping them separated from the surrounding scope.

The example below shows how to use the vm module in a function:

/**
* An example of using Node.js VM API in an Azion Function.
* Support:
* - Partially supported (Extended by library `vm-browserify`)
* @module runtime-apis/nodejs/vm/main
* @example
* // Execute with Azion Bundler:
* npx edge-functions build
* npx edge-functions dev
*/
import vm from "node:vm";
// Set a global variable because bundler esbuild minify the code and rename the variable.
globalThis.contextVar = "initial value";
/**
* An example of using the Node.js VM API in an Azion Function.
* @param {*} event
* @returns {Promise<Response>}
*/
const main = async (event) => {
const vmResult = vm.runInThisContext(
'globalThis.contextVar = "change by vm";'
);
console.log(
`vmResult: '${vmResult}', globalThis.contextVar: '${globalThis.contextVar}'`
);
return new Response("Done!", { status: 200 });
};
export default main;w