import { NgDocSearchEngine } from '@ng-doc/app/classes/search-engine';
import { NgDocSearchResult } from '@ng-doc/app/interfaces';
import * as stemmer from '@orama/stemmers';
import { Observable } from 'rxjs';
/**
 * Options for the `NgDocDefaultSearchEngine`.
 */
export interface NgDocDefaultSearchEngineOptions {
    /**
     * The language to use for the search engine.
     */
    stemmer?: typeof stemmer.stemmer;
    /**
     * Specifies the maximum distance (following the Levenshtein algorithm) between the term and the searchable property.
     * (doesn't work with `exact` option)
     */
    tolerance?: number;
    /**
     * If `true`, finds all the document with an exact match of the term property.
     */
    exact?: boolean;
    /**
     * Number of results to return (default: 10).
     */
    limit?: number;
}
/**
 * Search engine for the documentation, it loads the index and provides a search method.
 */
export declare class NgDocDefaultSearchEngine extends NgDocSearchEngine {
    private options?;
    private db$;
    constructor(options?: NgDocDefaultSearchEngineOptions | undefined);
    /**
     * Search the documentation for the given query.
     * @param query The query to search for.
     */
    search(query: string): Observable<NgDocSearchResult[]>;
    private request;
}