polyfillme

A Node.js module to scan your codebase for unsupported JavaScript features (based on ES/ECMA version) and generate a polyfill file for missing features.

Features

• Scans files using AST parser (espree)
• Uses compatibility data (core-js-compat)
• Identifies unsupported features for a given ES/ECMA version
• Generates a polyfill file for missing features
• Supports custom polyfill sources

Installation

npm install polyfillme core-js-compat fast-glob espree

Usage

const polyfillme = require("polyfillme");

polyfillme({
	ecmaVersion: "es2018",
	files: ["src/**/*.js"],
	includedPolyfills: ["Promise"],
	additionalPolyfills: ["Array.prototype.flat"]
}).then((polyfills) => {
	console.log("Required polyfills:", polyfills);
});

API

polyfillme(options)

• ecmaVersion (string): Target ES/ECMA version (e.g., 'es2018')
• files (string[]): List of file globs to scan
• includedPolyfills (string[]): Already included polyfills
• additionalPolyfills (string[]): Additional polyfills to include

Returns: Promise<string[]> - List of required polyfills

Output

Generates a polyfills.js file with imports for required polyfills.

License

MIT