Function fetchLinkTitle

ui-tui/src/lib/externalLink.ts:370–404

(url: string)

}

export function fetchLinkTitle(url: string): Promise<string> {
  const normalizedUrl = normalizeExternalUrl(url)
  const key = titleCacheKey(normalizedUrl)

  if (!isTitleFetchable(normalizedUrl)) {
    return Promise.resolve('')
  }

  if (titleCache.has(key)) {
    return Promise.resolve(titleCache.get(key) ?? '')
  }

  const pending = titleInflight.get(key)

  if (pending) {
    return pending
  }

  const promise = fetchHtmlTitle(normalizedUrl)
    .then(usableTitle)
    .catch(() => '')
    .then(clean => {
      cacheTitle(key, clean)
      titleSubs.get(key)?.forEach(sub => sub(clean))

      return clean
    })
    .finally(() => {
      titleInflight.delete(key)
    })

  titleInflight.set(key, promise)

  return promise
}

export function useLinkTitle(url?: null | string): string {
  const normalizedUrl = useMemo(() => (url ? normalizeExternalUrl(url) : ''), [url])