/**
 * Counts the number of non-null elements in an array.
 * @param data - An array of any type
 * @returns The count of elements that are neither null nor undefined
 * @example
 * count([1, null, 'a', undefined]) // Returns 2
 * count([]) // Returns 0
 * count([null, undefined]) // Returns 0
 */
export declare function count(d: unknown[]): number;