import { Key } from './key';
/**
 * Break the string `s` into words.
 * For each word, if `isKey` is true, then push the key into the stack.
 *
 * @export
 * @param {KeyStack} stack
 * @param {string} s
 *
 * Learned from `KeyList.buildKeyStack(KeyStack stack, String s)`
 *
 * Rank keeping algorithm from `KeyStack#pushKey` method has been merged
 * into this method as well.
 */
export declare function buildKeyStack(keys: Key[], tokens: string[]): Key[];