import * as functions from 'firebase-functions';
/**
 * Full Text Search
 * @param change - functions change interface
 * @param context - event context
 * @param field - the field to index
 * @param fk - the foreign key fields to get
 * @param type - { id, map, array } - defaults to id
 * @param n - number of word chunks to index at a time
 * @param searchCol - name of search collection
 */
export declare function fullTextIndex(change: functions.Change<functions.firestore.DocumentSnapshot>, context: functions.EventContext, field: string, fk?: string, type?: string, n?: number, searchCol?: string): Promise<null>;