rsnext/packages/next/client/request-idle-callback.ts

type RequestIdleCallbackHandle = any
type RequestIdleCallbackOptions = {
  timeout: number
}
type RequestIdleCallbackDeadline = {
  readonly didTimeout: boolean
  timeRemaining: () => number
}

declare global {
  interface Window {
    requestIdleCallback: (
      callback: (deadline: RequestIdleCallbackDeadline) => void,
      opts?: RequestIdleCallbackOptions
    ) => RequestIdleCallbackHandle
  }
}

const requestIdleCallback =
  (typeof self !== 'undefined' && self.requestIdleCallback) ||
  function (cb: (deadline: RequestIdleCallbackDeadline) => void) {
    let start = Date.now()
    return setTimeout(function () {
      cb({
        didTimeout: false,
        timeRemaining: function () {
          return Math.max(0, 50 - (Date.now() - start))
        },
      })
    }, 1)
  }

export default requestIdleCallback