timers.d.ts
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			declare function setTimeout(callback: () => void, delay: number): number;
			declare function clearTimeout(timerId: number): void;
			declare function setInterval(callback: () => void, delay: number): number;
			declare function clearInterval(timerId: number): void;
			declare function setImmediate(callback: () => void): number;
			declare function clearImmediate(immediateId: number): void;
			declare function queueMicrotask(callback: () => void): void;

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