/**
 * Select keyboard behavior.
 */
export type MdySelectMoveTarget = "next" | "previous" | "first" | "last";
/**
 * Returns the next active option key for a move intent, or null when the
 * target cannot be moved to (e.g. no enabled options).
 */
export declare function selectNextActiveKey(target: MdySelectMoveTarget, activeKey: string | null, enabledKeys: readonly string[]): string | null;
/**
 * Returns the key of the first option whose label starts with the typed
 * character(s), or null if no match is found.
 */
export declare function selectTypeaheadKey(query: string, enabledKeys: readonly string[], labelForKey: (key: string) => string): string | null;