import type { ListOf } from '../internal/types/union.js';
export type Size<O extends object> = O extends {
  length: number;
}
  ? O['length']
  : O extends Map<any, any>
  ? O['size']
  : O extends Set<any>
  ? O['size']
  : string extends keyof O
  ? number
  : number extends keyof O
  ? number
  : symbol extends keyof O
  ? number
  : keyof O extends never
  ? 0
  : ListOf<keyof O>['length'];
/**
 * Returns the number of enumerable properties and methods of an object or the length of an array-like object.
 * @param o Object that contains the properties and methods. This can be an object that you created or an existing Document Object Model (DOM) object.
 *
 * @example
 * ```typescript
 * size({ a: 1, b: 2, c: 3 }); // => 3
 * size({ length: 3 }); // => 3
 * size(new Map([['a', 1], ['b', 2], ['c', 3]])); // => 3
 * size(new Set([1, 2, 3, 4])); // => 4
 * ```
 */
declare const size: <const O extends object>(o: O) => Size<O>;
export default size;
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