Node.js Polyfills

Install Web API polyfills for Node.js environments.

Capabilities

Install Polyfills

/**
 * Install Web API polyfills as globals in Node.js
 * Adds: crypto, File
 * @returns void
 */
function installPolyfills(): void;

Usage:

import { installPolyfills } from '@sveltejs/kit/node/polyfills';

// Call before using Web APIs in Node.js
installPolyfills();

// Now these APIs are available as globals
const file = new File(['content'], 'filename.txt');
crypto.randomUUID();

Notes

• Import from @sveltejs/kit/node/polyfills
• Call once at application startup
• Makes Web APIs available as globals in Node.js
• Polyfills include:
  • crypto: Web Crypto API
  • File: File API
• Note: FormData, Headers, Request, and Response are NOT polyfilled by this function - they are available natively in Node.js 18+
• Required for some adapters (e.g., adapter-node) when using File or crypto APIs
• Node.js 18+ includes most Web APIs natively