foxts/dist/property-count/index.d.ts

Opinionated collection of common TypeScript utils by @SukkaW

/**
 * Ponyfill for the TC39 "Property Counting" proposal.
 *
 * @see https://github.com/tc39/proposal-object-property-count
 */
/**
 * Counts own, enumerable, string-keyed properties (including array indices).
 *
 * Equivalent to `Object.keys(target).length`, but without allocating the
 * intermediate array.
 */
declare function keysLength(target: object): number;
/**
 * Counts own, string-keyed properties (including array indices), both
 * enumerable and non-enumerable.
 *
 * There is no allocation-free reflection primitive for this, so it delegates to
 * `Object.getOwnPropertyNames(target).length`.
 */
declare function getOwnPropertyNamesLength(target: object): number;
/**
 * Counts own, symbol-keyed properties, regardless of enumerability.
 *
 * There is no allocation-free reflection primitive for this, so it delegates to
 * `Object.getOwnPropertySymbols(target).length`.
 */
declare function getOwnPropertySymbolsLength(target: object): number;

export { getOwnPropertyNamesLength, getOwnPropertySymbolsLength, keysLength };