import { ComponentType } from 'react';
export type Diff<T, U> = Pick<T, Exclude<keyof T, keyof U>>;
/**
 * TODO: Avoid diffing by passing individual values into a React component
 * rather than the whole `store`, and letting React and `shouldComponentUpdate`
 * handle diffing for us.
 */
export declare function equals<T>(a: T, b: T): boolean;
export type Immutable = {
    equals(b: any): boolean;
};
export declare function isImmutable(a: any): a is Immutable;
export declare function getDisplayName<T>(Component: ComponentType<T>): string;
export declare function keys<O extends object>(o: O): (keyof O)[];
export declare function mapValues<O extends object, K extends keyof O, T>(o: O, f: (value: O[K], key: K) => T): {
    [K in keyof O]: T;
};
export declare function some<O extends object>(o: O, f: <K extends keyof O>(v: O[K], k: K) => boolean): boolean;