Function useResolvedLinkPreviews

desktop/src/shared/lib/useResolvedLinkPreviews.ts:46–92

(
  previews: SupportedLinkPreview[],
)

}

export function useResolvedLinkPreviews(
  previews: SupportedLinkPreview[],
): SupportedLinkPreview[] {
  const [resolvedTitles, setResolvedTitles] = React.useState<
    Record<string, string>
  >({});

  React.useEffect(() => {
    let cancelled = false;
    const pending = previews.filter(shouldResolveTitle);
    if (pending.length === 0) return undefined;

    for (const preview of pending) {
      const cached = titleCache.get(preview.href);
      if (typeof cached === "string" && cached) {
        setResolvedTitles((current) =>
          current[preview.href] === cached
            ? current
            : { ...current, [preview.href]: cached },
        );
        continue;
      }

      void cacheTitle(preview.href).then((title) => {
        if (cancelled || !title) return;
        setResolvedTitles((current) =>
          current[preview.href] === title
            ? current
            : { ...current, [preview.href]: title },
        );
      });
    }

    return () => {
      cancelled = true;
    };
  }, [previews]);

  return React.useMemo(
    () =>
      previews.map((preview) => {
        const title = resolvedTitles[preview.href];
        return title ? { ...preview, title } : preview;
      }),
    [previews, resolvedTitles],
  );
}