Let Inferred Types Win Over Hand-Written Ones

A helper like this looks harmless:

function isPublished(post: { data: { date: string; draft?: boolean } }) {
  return !post.data.draft && new Date(post.data.date) <= new Date();
}

But Astro’s content collections infer draft as boolean | undefined, not draft?: boolean. Under strict mode those aren’t the same thing, and astro check reports a type mismatch anywhere a real post reaches the helper.

The fix is to stop hand-writing the parameter type and let the properly-typed post from getCollection flow straight into the check, inlined at each call site instead of behind a helper with its own annotation:

posts.filter((post) => !post.data.draft && new Date(post.data.date) <= new Date());

Same behavior, no annotation to keep in sync with the schema. Whenever a hand-rolled type on a helper drifts from the type the framework actually generates, inlining the check is the quickest way back to green.