is-valid-es-identifier

Single-purpose node module that determines whether a string is a valid javascript identifier.

This implementation has been optimized for performance.

Supports ES6/ES2015 or newer. ES5 or non-strict mode not supported

import { isValidESIdentifier } from './index.js';

// true
let isValid = isValidESIdentifier('x');

// false
isValid = isValidESIdentifier(' not a var ');

// win the respect of your colleagues with this highly maintainable code
isValid = isValidESIdentifier('ᚢᚫᚱ');

Installation

$ npm install is-valid-es-identifier

Special Thanks/Acknowledgements

This implementation draws heavily on the excellent research of Matthias Bynens, who did the legwork in explaining valid variable names for ES5 and ES6.

License

Copyright (c) 2017 Steve Westbrook Copyright (c) 2024 Marty Nelson

MIT