export default function typeahead({ debounceInterval }?: {
    debounceInterval?: number | undefined;
}): {
    subscribe: (this: void, run: import("svelte/store").Subscriber<string>, invalidate?: ((value?: string | undefined) => void) | undefined) => import("svelte/store").Unsubscriber;
    add: (letter: string) => void;
    reset: () => void;
};