// Type definitions for core/snapshot

type Omit<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;
type Merge<M, N> = Omit<M, Extract<keyof M, keyof N>> & N;

/**
 * Determines if the  `window`  is available
 */
export function isWindowReady(): boolean;
/**
 * Executes a callback, such as registering event handlers, when a valid  `window`  is available.
 * 
 * During normal operation, the callback will be executed immediately. During a pre-rendering pass,
the callback is not be executed at all. When using snapshot, the callback is added to a queue
and is executed in order once the window is available.
 * 
 * _Important Notes_
 * *  The callback should not alter the initial HTML state. If it does, it will invalidate the
pre-render state and interfere with React rehydration.
 * *  The callback should be limited to module-scoped actions and not component instance actions. If
the action is tied to a component, it should be invoked from within the component's lifecycle
methods.
 */
export function onWindowReady(callback: Function): void;
/**
 * Executes all queued window callbacks.
 *
 * Requires that the window be, in fact, available and will throw an  `Error`  if not.
 */
export function windowReady(): void;