Debounce function

debounce.ts

export function Debounce (fn: Function, wait = 200) {
    let timerId: number
    let lastArgs: Array<any> | undefined
    let lastCallTime: DOMHighResTimeStamp
    let lastThis
    let result
    const startTimer = (pendingFunc: FrameRequestCallback) => {
        cancelAnimationFrame(timerId)
        return requestAnimationFrame(pendingFunc)
    }
    const timerExpired = () => {
        const timeSinceLastCall = performance.now() - lastCallTime
        if (timeSinceLastCall >= wait || timeSinceLastCall < 0) {
            result = fn.apply(lastThis, lastArgs)
            lastArgs = lastThis = void 0
            return result
        }
        timerId = startTimer(timerExpired)
    }
    return (...args: Array<any>) => {
        lastArgs = args
        lastCallTime = performance.now()
        lastThis = this
        if (timerId === void 0) {
            timerId = startTimer(timerExpired)
        }
        return result
    }
}