Skip printing async if await is not used

[bluwy]

Changes

Idea by @natemoo-re. Currently we always print the component function with async even if no top-level await is used:

const $$stdin = $$createComponent(async ($$result, $$props, $$slots) => {

We can skip printing the async if no await is used so that rendering the component won't always require one tick.

---

Performance:

This should improve page rendering. With the Astro docs repo, it fluctuates between 35-42s a lot, so it's hard to make a concrete comparison. But compared to the old timings, the average timing dropped about 1-2s.

Testing

Updated test

Docs

n/a. internal improvement.

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🦋 Changeset detected

Latest commit: ff02944

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

This PR includes changesets to release 1 package

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@astrojs/compiler	Patch

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[natemoo-re]

LGTM! Glad to see that this idea does have some small gains.