/**
 * Returns the first argument
 * @param v
 */
export declare const identity: <T>(v: T) => T;
/**
 * Check two objects is shallow equal or not
 * @param a
 * @param b
 */
export declare function shallowEqual<T extends object>(a: T, b: T): boolean;
/**
 * Copy properties from src function to dst function, and returns dst
 *
 * @param src
 * @param dst
 */
export declare function hoistMethod<M extends (...args: any[]) => any>(src: M, dst: (...args: Parameters<M>) => ReturnType<M>): M;
export declare const kAmosObject: unique symbol;
/**
 * A symbol indicates the object is a amos' object.
 */
export interface AmosObject<K extends string> {
    [kAmosObject]: K;
}
/**
 * Check an object is an amos object or not
 *
 * @param key
 * @param o
 */
export declare function isAmosObject<T extends AmosObject<any>>(key: T[typeof kAmosObject], o: any): o is T;
/**
 * Check two array is shallow equal or not
 * @param a
 * @param b
 */
export declare function arrayEqual<T extends ArrayLike<any>>(a: T, b: T): boolean;
export declare function config<T extends object>(this: T, options: object): T;