Provides a list of reserved identifiers for JavaScript

It assumes the latest JavaScript version (ES2023) and module context. Supporting older JavaScript versions is a non-goal.

npm install reserved-identifiers

import reservedIdentifiers from 'reserved-identifiers';

const identifiers = reservedIdentifiers();
const isReserved = identifier => identifiers.has(identifier);

console.log(isReserved('await'));
//=> true

Returns a Set with the identifiers.

Type: object

Type: boolean
Default: false

Include the global properties globalThis, Infinity, NaN, and undefined. Although not officially reserved, they should typically not be used as identifiers.

• is-identifier - Check if a string is a valid JavaScript identifier