import * as functions from 'firebase-functions';
/**
 * Creates a unique field index
 * @param colPath - collection / field name
 * @param field - field value
 * @param fkName - foreign key name
 * @param fkVal - foreign key value
 * @param uniqueCol - unique collection
 */
export declare function createField(colPath: string, field: string, fkName: string, fkVal: string, uniqueCol?: string): Promise<any>;
/**
 * Deletes a unique field index
 * @param colPath - collection / field name
 * @param field - field value
 * @param uniqueCol - unique collection
 */
export declare function deleteField(colPath: string, field: string, uniqueCol?: string): Promise<any>;
/**
 * Updates a unique field index
 * @param colPath - collection / field name
 * @param oldField - old field value
 * @param newField - new field value
 * @param fkName - foreign key name
 * @param fkVal - foreign key value
 * @param uniqueCol - unique collectino
 */
export declare function updateField(colPath: string, oldField: string, newField: string, fkName: string, fkVal: string, uniqueCol?: string): Promise<any>;
/**
 * Handle all unique instances
 * @param change - change snapshot
 * @param context - event context
 * @param field - feild to index
 * @param friendly - boolean: save friendly string
 * @param newField - the value of the field if you want to filter it
 * @param fkName - name of foreign key field
 * @param uniqueCol - name of unique collection
 */
export declare function uniqueField(change: functions.Change<functions.firestore.DocumentSnapshot>, context: functions.EventContext, field: string, friendly?: boolean, newField?: string, fkName?: string, uniqueCol?: string): Promise<null>;