sanity/src/core/validation/util/requestIdleCallback.ts

Sanity is a real-time content infrastructure with a scalable, hosted backend featuring a Graph Oriented Query Language (GROQ), asset pipelines and fast edge caches

/**
 * Simple requestIdleCallback polyfill
 * Can be removed when all browsers support requestIdleCallback: https://caniuse.com/requestidlecallback
 * @param callback -
 * @param options -
 */
const requestIdleCallbackShim: typeof window.requestIdleCallback = function requestIdleCallbackShim(
  callback,
  options?,
): number {
  const start = Date.now()
  return window.setTimeout(() => {
    callback({
      didTimeout: false,
      timeRemaining() {
        return Math.max(0, Date.now() - start)
      },
    })
  }, 0)
}

const cancelIdleCallbackShim: typeof window.cancelIdleCallback = function cancelIdleCallbackShim(
  handle: number,
): void {
  return window.clearTimeout(handle)
}

const win = typeof window === 'undefined' ? undefined : window

export const requestIdleCallback = win?.requestIdleCallback || requestIdleCallbackShim
export const cancelIdleCallback = win?.cancelIdleCallback || cancelIdleCallbackShim