import type { Component, PureComponent } from 'react';
export declare function isControlled<P extends {}, S extends {}, C extends Component<P, S> | PureComponent<P, S>>(self: C, prop: keyof P): boolean;
export declare function getState<C extends Component | PureComponent>(self: C, state?: C['state']): any;
export declare function internalSetState<T, C extends Component<any, T> | PureComponent<any, T>>(self: C, changes: Partial<T> | ((combinedState: Partial<T>) => Partial<T>), callback?: () => void): void;