interface RequestIdleCallback {
    didTimeout?: boolean;
    timeRemaining?(): DOMHighResTimeStamp;
}

interface RequestIdleCallbackOptions {
    timeout?: number;
}

type RequestIdleCallbackId = number;

interface Window {
    requestIdleCallback(
        cb: (deadline: RequestIdleCallback) => any,
        options?: RequestIdleCallbackOptions
    ): RequestIdleCallbackId;
    cancelIdleCallback(id: RequestIdleCallbackId): void;
}