[dajiaohuang]

Summary

useHead queued its title on mount even when no title was provided, and the dispatcher always wrote the first queued title to document.title. A metas-only useHead therefore set document.title to the literal string "undefined", and a metas-only child could overwrite a title set by useTitle in a parent.

• Only queue a title from useHead when one is provided.
• Only assign document.title while a title or template is queued, so a metas-only render leaves an existing/static title alone.

Reproduction

const Child = () => {
  useHead({ metas: [{ name: 'description', content: 'x' }] });
  return null;
};

const App = () => {
  useTitle('Parent title');
  return <Child />;
};

Before this change document.title became "undefined" after the first batch; with the change it stays "Parent title".

Validation

• Added useHead regression tests for a metas-only render and a metas-only child under useTitle.
• Added a useMeta-only regression test for the dispatcher title handling.
• All three new regression tests fail against the base source and pass with this change.
• pnpm test -- --run: 39 tests passed.
• pnpm build: passed.

The changeset is a patch for hoofd.

[changeset-bot]

🦋 Changeset detected

Latest commit: 8b14226

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
hoofd	Patch

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