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// @ts-check
/** * Scrolls the browser window to a URL hash target element (if it exists), or to * the start if the hash is undefined. * @param {string} [hash] URL hash. */export default function scrollToHash(hash) {  if (hash !== undefined && typeof hash !== "string") {    throw new TypeError("Argument 1 `hash` must be a string.");  }
  if (hash) {    const element = document.querySelector(hash);    if (element) element.scrollIntoView();  } else scrollTo(0, 0);}