/** How long successive keys keep merging into one search before the buffer resets. */
export declare const TYPEAHEAD_TIMEOUT_MS = 1000;
/** Plain printable character, not a shortcut or named key. */
export declare function isTypeaheadKey(event: {
    key: string;
    ctrlKey: boolean;
    metaKey: boolean;
    altKey: boolean;
}): boolean;
/**
 * Text typeahead matches: explicit `data-text-value`, else rendered text, since raw `textContent` fails for items rendering beyond their label.
 * @internal
 */
export declare function itemText(el: Element): string;
/** Letter-key search like native `<select>` (accumulating buffer and timer), shared by every collection and menu family. */
export declare class Typeahead {
    private buffer;
    private timer?;
    /**
     * Matches `key` against the label collection, accumulating a 1s buffer (`"s"` + `"a"` = `"sa"`); repeating one letter cycles through matches.
     *
     * @returns the index to move to, or `-1` for no match.
     */
    match(key: string, labels: string[], currentIndex: number): number;
    /** Drops the pending buffer and its timer. Call when the owner unmounts or closes. */
    clear(): void;
}