/** @module pairs/pairKeys.ts */
/**
 * Takes a tuple pair and returns the first (key) values in an array
 * @param entries array of tuples
 * @sig ([k,v]) -> k[]
 * @example
 * pairKeys([[1,2],[3,4]])
 * //=> [1,3]
 */
export declare const pairKeys: <K, V>(entries: [K, V][]) => K[];