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Filename : globalState.js

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import { RESTORE_FOCUS_TIMEOUT } from './constants.js'

/** @type {GlobalState} */
const globalState = {}

export default globalState

const focusPreviousActiveElement = () => {
  if (globalState.previousActiveElement instanceof HTMLElement) {
    globalState.previousActiveElement.focus()
    globalState.previousActiveElement = null
  } else if (document.body) {
    document.body.focus()
  }
}

/**
 * Restore previous active (focused) element
 *
 * @param {boolean} returnFocus
 * @returns {Promise<void>}
 */
export const restoreActiveElement = (returnFocus) => {
  return new Promise((resolve) => {
    if (!returnFocus) {
      return resolve()
    }
    const x = window.scrollX
    const y = window.scrollY

    globalState.restoreFocusTimeout = setTimeout(() => {
      focusPreviousActiveElement()
      resolve()
    }, RESTORE_FOCUS_TIMEOUT) // issues/900

    window.scrollTo(x, y)
  })
}