Fix styles dropped when an await precedes a propagating component in slot markup by matthewp · Pull Request #17232 · withastro/astro

matthewp · 2026-06-29T13:50:16Z

Changes

Fixes <style> tags from propagating components (e.g. a content collection's Content) being silently dropped when an await appears before the component in slot markup.
Head propagation discovers these components by eagerly pre-rendering slots. An await in the slot suspended that pre-render before the component was reached, so it registered too late and its styles were never collected. Astro now awaits pending async slot pre-renders while collecting head content on routes that use propagation. Routes without propagation are unaffected and keep streaming.

Testing

Adds a content-collections integration test: a Content rendered after an await in slot markup, asserting its propagated stylesheet survives.
Adds unit tests for the head-collection loop covering an async slot that registers a propagator after an await, including a nested case.

Docs

No docs update needed — restores expected behavior that component styles are collected regardless of where await appears.

Closes #17218

changeset-bot · 2026-06-29T13:50:22Z

🦋 Changeset detected

Latest commit: 1b37d6d

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

This PR includes changesets to release 393 packages

Name	Type
astro	Patch
@e2e/astro-linked-lib	Patch
@e2e/actions-blog	Patch
@e2e/actions-react-19	Patch
@e2e/astro-component	Patch
@e2e/astro-envs	Patch
@e2e/astro-island-hydration-error	Patch
@test/astro-cloudflare-node-prerender-mdx	Patch
@test/astro-cloudflare	Patch
@e2e/content-collections	Patch
@e2e/csp-server-islands	Patch
@e2e/css	Patch
@test/custom-client-directives	Patch
@e2e/dev-toolbar	Patch
@e2e/error-cyclic	Patch
@e2e/error-sass	Patch
@e2e/errors	Patch
@e2e/hydration-race	Patch
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@test/nested-style-bug-e22e	Patch
@e2e/preact-compat-component	Patch
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@e2e/prefetch	Patch
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@e2e/server-islands-key	Patch
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@e2e/vite-virtual-modules	Patch
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fake-astro-library	Patch
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@test/astro-slots-nested	Patch
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@test/content-with-spaces-in-folder-name	Patch
@test/content-collection-picture-render	Patch
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@test/core-image-remark-infersize	Patch
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@test/core-image-picture-emit-file	Patch
@test/core-image-remark-imgattr	Patch
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@test/core-image-unconventional-settings	Patch
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…t markup Gates async slot pre-render awaiting on routes that use head propagation and discovers propagators via a fixpoint loop, so propagating components behind an await in slot markup are collected without blocking the head on unrelated markup awaits. Closes #17218

codspeed-hq · 2026-06-29T13:58:45Z

Merging this PR will degrade performance by 23.92%

⚠️

Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

❌ 1 regressed benchmark
✅ 17 untouched benchmarks

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
❌	Simulation	`many-components [streaming]`	8.8 ms	11.6 ms	-23.92%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

_{Comparing fix/propagation-async-slot-discovery (1b37d6d) with main (f105321)¹}

No successful run was found on main (c000b00) during the generation of this report, so f105321 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

pkg-pr-new · 2026-06-29T14:22:16Z

npm i https://pkg.pr.new/astro@17232

npm i https://pkg.pr.new/@astrojs/rss@17232

npm i https://pkg.pr.new/create-astro@17232

npm i https://pkg.pr.new/@astrojs/cloudflare@17232

commit: f60c8aa

ematipico · 2026-06-29T14:34:41Z

+ * Discovery is a fixpoint: initializing one propagator can register more (the
+ * `in-tree` -> `self` chain), and resolving a pending async slot pre-render can
+ * register propagators that live behind an `await` in slot markup. We keep
+ * draining both until neither produces new work — i.e. "wait until there are no
+ * more propagators".


What's a "fixpoint"? And "can register more..." more what? Removing the parenthesis, it seems something is missing.

and resolving a pending async slot pre-render can register propagators that live behind an await in slot markup

Any chance we can make this phrase a bit more simple? It's hard to follow.

ematipico · 2026-06-29T14:38:22Z

+			// Restart the loop so any work queued during `init()` is drained
+			// before advancing.
+			break;


This isn't needed? We're already at the end of the for loop

This breaks out the for loop. It travels back to the top of the while loop so that we drain new pending slots. I added a new comment to explain more.

ah sorry, not sure why but I was thinking at the continue. Thank you for the comment, it was still weird

This PR contains the following updates: | Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---| | [@astrojs/markdown-remark](https://astro.build) ([source](https://github.com/withastro/astro/tree/HEAD/packages/markdown/remark)) | [`7.2.0` → `7.2.1`](https://renovatebot.com/diffs/npm/@astrojs%2fmarkdown-remark/7.2.0/7.2.1) | ![age](https://developer.mend.io/api/mc/badges/age/npm/@astrojs%2fmarkdown-remark/7.2.1?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/@astrojs%2fmarkdown-remark/7.2.0/7.2.1?slim=true) | | [astro](https://astro.build) ([source](https://github.com/withastro/astro/tree/HEAD/packages/astro)) | [`7.0.4` → `7.0.6`](https://renovatebot.com/diffs/npm/astro/7.0.4/7.0.6) | ![age](https://developer.mend.io/api/mc/badges/age/npm/astro/7.0.6?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/astro/7.0.4/7.0.6?slim=true) | --- ### Release Notes <details> <summary>withastro/astro (@astrojs/markdown-remark)</summary> ### [`v7.2.1`](https://github.com/withastro/astro/blob/HEAD/packages/markdown/remark/CHANGELOG.md#721) [Compare Source](https://github.com/withastro/astro/compare/@astrojs/[email protected]...@astrojs/[email protected]) ##### Patch Changes - Updated dependencies \[[`eb6f97e`](withastro/astro@eb6f97e)]: - [@astrojs/internal-helpers](https://github.com/astrojs/internal-helpers)@0.10.1 </details> <details> <summary>withastro/astro (astro)</summary> ### [`v7.0.6`](https://github.com/withastro/astro/blob/HEAD/packages/astro/CHANGELOG.md#706) [Compare Source](https://github.com/withastro/astro/compare/[email protected]@7.0.6) ##### Patch Changes - [#17261](withastro/astro#17261) [`79aa99c`](withastro/astro@79aa99c) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes a false deprecation warning for `markdown.gfm` and `markdown.smartypants` when using the Container API - [#17247](withastro/astro#17247) [`f94280d`](withastro/astro@f94280d) Thanks [@chatman-media](https://github.com/chatman-media)! - Fixes route generation throwing "Missing parameter" (or silently dropping the segment) when a dynamic param's value is `0`. The generator used truthy checks instead of checking for `undefined`, so `paginate(posts, { params: { categoryId: 0 } })` would crash even though `0` is a perfectly valid param value. - [#17278](withastro/astro#17278) [`6f11739`](withastro/astro@6f11739) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes missing CSS for virtual style modules (e.g., responsive image layout styles) in dev mode when JavaScript is disabled - [#17250](withastro/astro#17250) [`0b30b35`](withastro/astro@0b30b35) Thanks [@matthewp](https://github.com/matthewp)! - Fixes the `security.checkOrigin` check so it is applied consistently to Astro Actions and on-demand endpoints, regardless of how the request pipeline is composed. Previously, the origin check could be skipped in the composable `astro/hono` pipeline depending on the order of the `middleware()` primitive (or when it was omitted). - [#17274](withastro/astro#17274) [`8c3579b`](withastro/astro@8c3579b) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes missing `render()` type overload for live collection entries. Previously, calling `render()` on a `LiveDataEntry` produced a TypeScript error when using only `live.config.ts` without a `content.config.ts`. - [#17257](withastro/astro#17257) [`4208297`](withastro/astro@4208297) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes `astro check` failing to find `@astrojs/check` and `typescript` when astro is installed in a directory outside the project tree (e.g. pnpm virtual store) - [#17272](withastro/astro#17272) [`b428648`](withastro/astro@b428648) Thanks [@matthewp](https://github.com/matthewp)! - Fixes island component paths so that extensionless imports (e.g. `import { Counter } from '../components/Counter'`) resolve to the real file on disk, matching Vite's extension order and directory `index` resolution. This makes the `include`/`exclude` options of JSX renderer integrations (React, Preact, Solid) match components imported without a file extension, and removes the spurious React 19 "Invalid hook call" warning logged on every request in dev when `include` was set alongside another JSX renderer - [#17279](withastro/astro#17279) [`2aeaa44`](withastro/astro@2aeaa44) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes a bug where `<Picture inferSize>` with a remote image could fail with `FailedToFetchRemoteImageDimensions` when the image server rate-limits requests (e.g. HTTP 429). Remote dimensions are now resolved once per render instead of once per output format. - [#17251](withastro/astro#17251) [`5240e26`](withastro/astro@5240e26) Thanks [@matthewp](https://github.com/matthewp)! - Hardens the handling of attribute rendering when using with custom elements. - [#17248](withastro/astro#17248) [`429bd62`](withastro/astro@429bd62) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes a crash when using Astro's `getViteConfig` with Vitest browser mode (e.g., Storybook vitest runner). Astro now skips dev server setup inside Vitest, preventing errors. - [#17260](withastro/astro#17260) [`14524c0`](withastro/astro@14524c0) Thanks [@matthewp](https://github.com/matthewp)! - Fixes a regression where a `<script>` inside a component rendered through `Astro.slots.render()` was hoisted out of its original position instead of staying next to its component content - Updated dependencies \[[`eb6f97e`](withastro/astro@eb6f97e)]: - [@astrojs/internal-helpers](https://github.com/astrojs/internal-helpers)@0.10.1 - [@astrojs/markdown-remark](https://github.com/astrojs/markdown-remark)@7.2.1 - [@astrojs/markdown-satteri](https://github.com/astrojs/markdown-satteri)@0.3.3 ### [`v7.0.5`](https://github.com/withastro/astro/blob/HEAD/packages/astro/CHANGELOG.md#705) [Compare Source](https://github.com/withastro/astro/compare/[email protected]@7.0.5) ##### Patch Changes - [#17242](withastro/astro#17242) [`9c05ba4`](withastro/astro@9c05ba4) Thanks [@matthewp](https://github.com/matthewp)! - Fixes an error that could occur after the dev server restarts when using an adapter such as `@astrojs/cloudflare`, where a request would fail with a `500` referencing a missing pre-bundled dependency: ``` The file does not exist at "node_modules/.vite/deps_ssr/astro_compiler-runtime.js?v=6419660d" which is in the optimize deps directory. The dependency might be incompatible with the dep optimizer. Try adding it to `optimizeDeps.exclude`. ``` - [#17202](withastro/astro#17202) [`c6d254d`](withastro/astro@c6d254d) Thanks [@matthewp](https://github.com/matthewp)! - Refactors path alias resolution to use Vite's native `tsconfigPaths` option This is an internal change with no expected impact on user projects. Astro now defers tsconfig and jsconfig `paths` alias resolution to Vite, keeping a small fallback for a few CSS cases Vite does not yet handle. - [#17123](withastro/astro#17123) [`72e29bd`](withastro/astro@72e29bd) Thanks [@martrapp](https://github.com/martrapp)! - Fixes an issue where the ClientRouter wipes head elements after page transitions if the `<head>` contains a `server:defer` component. - [#17232](withastro/astro#17232) [`257505e`](withastro/astro@257505e) Thanks [@matthewp](https://github.com/matthewp)! - Fixes a bug where `<style>` tags from components such as a content collection's `Content` could be silently dropped from the output when an `await` appeared before the component in an `.astro` file's markup. - [#17193](withastro/astro#17193) [`a7352fd`](withastro/astro@a7352fd) Thanks [@jan-kubica](https://github.com/jan-kubica)! - Fixes the background dev server failing to start when `astro` is hoisted outside the project's `node_modules` (for example bun workspaces). The background process is now spawned from Astro's own resolved location instead of a path assumed under the project root. - [#17255](withastro/astro#17255) [`581d171`](withastro/astro@581d171) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes prefetch not working for links inside `server:defer` components </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 👻 **Immortal**: This PR will be recreated if closed unmerged. Get [config help](https://github.com/renovatebot/renovate/discussions) if that's undesired. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).

github-actions Bot added pkg: astro Related to the core `astro` package (scope) docs pr labels Jun 29, 2026

matthewp force-pushed the fix/propagation-async-slot-discovery branch from 290afc5 to 87ff83e Compare June 29, 2026 13:52

matthewp force-pushed the fix/propagation-async-slot-discovery branch from 87ff83e to f60c8aa Compare June 29, 2026 13:57

matthewp marked this pull request as ready for review June 29, 2026 14:04

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style tag is vanishing when doing async file IO in the site markup/JSX #17218

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ematipico reviewed Jun 29, 2026

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Clarify head-collection loop comments from review

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ematipico approved these changes Jun 30, 2026

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matthewp merged commit 257505e into main Jun 30, 2026
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matthewp deleted the fix/propagation-async-slot-discovery branch June 30, 2026 15:57

astrobot-houston mentioned this pull request Jun 30, 2026

[ci] release #17237

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astrobot-houston mentioned this pull request Jul 9, 2026

Quadratic Render Time by Number of Components in Astro 7 #17343

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Fix styles dropped when an await precedes a propagating component in slot markup#17232

Fix styles dropped when an await precedes a propagating component in slot markup#17232
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