import * as functions from 'firebase-functions';
/**
 * The check functions for type of change
 * @param change
 */
export declare function updateDoc(change: functions.Change<functions.firestore.DocumentSnapshot>): boolean;
export declare function createDoc(change: functions.Change<functions.firestore.DocumentSnapshot>): boolean;
export declare function deleteDoc(change: functions.Change<functions.firestore.DocumentSnapshot>): boolean;
export declare function writeDoc(change: functions.Change<functions.firestore.DocumentSnapshot>): boolean;
export declare function shiftDoc(change: functions.Change<functions.firestore.DocumentSnapshot>): boolean;
export declare function popDoc(change: functions.Change<functions.firestore.DocumentSnapshot>): boolean;
/**
 * Return a friendly url for the db
 * @param url
 */
export declare function getFriendlyURL(url: string): string;
/**
 * Determines if is an update or create trigger function
 * @param after
 * @param before
 */
export declare function canContinue(after: any, before: any): boolean;
/**
 * Check for trigger function
 * @param change - change ref
 * @param context - event context
 */
export declare function isTriggerFunction(change: functions.Change<functions.firestore.DocumentSnapshot>, context: functions.EventContext): boolean;
/**
 * trigger Function to update dates and filtered values
 * @param change - change event
 * @param data - data to update
 * @param updateDates - use createdAt and updatedAt
 */
export declare function triggerFunction(change: functions.Change<functions.firestore.DocumentSnapshot>, data?: any, updateDates?: boolean): Promise<null>;
/**
 * Gets the unique values from the combined array
 * @param a1
 * @param a2
 * @return - unique values array
 */
export declare function findSingleValues(a1: any[], a2: any[]): any[];
/**
 * Determine if arrays are equal
 * @param a1
 * @param a2
 * @return - boolean
 */
export declare function arraysEqual(a1: any[], a2: any[]): boolean;
/**
 * Get the after value or null
 * @param change
 * @param val
 */
export declare function getAfter(change: functions.Change<functions.firestore.DocumentSnapshot>, val: string): any;
/**
 * Get the before value or null
 * @param change
 * @param val
 */
export declare function getBefore(change: functions.Change<functions.firestore.DocumentSnapshot>, val: string): any;
/**
 * Returns the latest value of a field
 * @param change
 * @param val
 */
export declare function getValue(change: functions.Change<functions.firestore.DocumentSnapshot>, val: string): any;
/**
 * Determine if there is a before value
 * @param change
 * @param val
 * @returns
 */
export declare function valueBefore(change: functions.Change<functions.firestore.DocumentSnapshot>, val: string): boolean;
/**
 * Determine if there is an after value
 * @param change
 * @param val
 * @returns
 */
export declare function valueAfter(change: functions.Change<functions.firestore.DocumentSnapshot>, val: string): boolean;
/**
 * Determine if a field has been created
 * @param change
 * @param val - field
 * @returns
 */
export declare function valueCreate(change: functions.Change<functions.firestore.DocumentSnapshot>, val: string): boolean;
/**
 * Determine if a field has been deleted
 * @param change
 * @param val - field
 * @returns
 */
export declare function valueDelete(change: functions.Change<functions.firestore.DocumentSnapshot>, val: string): boolean;
/**
 * Determine if a field value has been updated
 * @param change
 * @param val
 */
export declare function valueChange(change: functions.Change<functions.firestore.DocumentSnapshot>, val: string): boolean;
/**
 * Returns the collection name
 * @param context
 */
export declare function getCollection(context: functions.EventContext): string;
/**
 * Checks for any updated value in array
 * @param change - change event
 * @param arr - array of values to check
 */
export declare function arrayValueChange(change: functions.Change<functions.firestore.DocumentSnapshot>, arr: string[]): boolean;
/**
 * Returns the category array
 * @param category
 */
export declare function getCatArray(category: string): any[];
/**
 * check for foreign key field(s) change
 * @param change
 * @param fk
 */
export declare function fkChange(change: functions.Change<functions.firestore.DocumentSnapshot>, fk: any): boolean;
export declare function soundex(s: string): string;
export declare function generateTrigrams(s: string): any;