/**
 * Shared combobox typeahead utility functions used by both Elements and React packages.
 * Only framework-agnostic functions belong here.
 */
/**
 * Checks if a character is a letter or space (Unicode-aware).
 */
export declare const isLetterOrSpace: (char: string) => boolean;
/**
 * Creates a typeahead handler that manages debounced character accumulation.
 * Returns a stateful handler — call destroy() when done to clear timeouts.
 */
export declare const createTypeaheadHandler: (timeout?: number) => {
    append: (char: string) => string;
    reset: () => void;
    getBuffer: () => string;
};
/**
 * Finds the first option element whose text content starts with the search string.
 * Works with an array of elements, matching against textContent.
 */
export declare const findTypeaheadOptionMatch: (options: {
    textContent: string | null;
}[], searchString: string) => number;