import { LookupFn, LookupFnResult, FilterFn } from "../helpers/lookup-fn";
export declare class SearchService<T, U> {
    private _options;
    private _optionsLookup?;
    private _optionsField?;
    optionsFilter: FilterFn<T>;
    get options(): T[];
    set options(options: T[]);
    get optionsLookup(): LookupFn<T, U> | undefined;
    set optionsLookup(lookupFn: LookupFn<T, U> | undefined);
    get hasItemLookup(): boolean;
    get optionsField(): string | undefined;
    set optionsField(field: string | undefined);
    private _results;
    private _resultsCache;
    get results(): T[];
    private _query;
    allowEmptyQuery: boolean;
    searchDelay: number;
    private _searchDelayTimeout;
    private _isSearching;
    get query(): string;
    get isSearching(): boolean;
    constructor(allowEmptyQuery?: boolean);
    updateQueryDelayed(query: string, callback?: (err?: Error) => void): void;
    updateQuery(query: string, callback?: (err?: Error) => void): void;
    private updateResults;
    initialLookup(initial: U): LookupFnResult<T>;
    initialLookup(initial: U[]): LookupFnResult<T[]>;
    private toRegex;
    highlightMatches(text: string, query: string): string;
    private reset;
}
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