Pure ESM package

Add "type": "module" to your package.json.

Replace "main": "index.js" with "exports": "./index.js" in your package.json.

Update the "engines" field in package.json to Node.js 12: "node": ">=12.20".

Remove 'use strict'; from all JavaScript files.

Replace all require()/module.export with import/export.

Use only full relative file paths for imports: import x from '.'; → import x from './index.js';.

If you have a TypeScript type definition (for example, index.d.ts), update it to use ESM imports/exports.

Optional but recommended, use the node: protocol for imports.