fix(dev): refresh stale CSS during HMR by thelazylamaGit · Pull Request #16957 · withastro/astro

thelazylamaGit · 2026-06-03T09:51:45Z

Closes: #16780

Changes

Invalidate per-route dev CSS virtual modules when CSS files change, preventing stale server-rendered inline styles after HMR.
Treat *.css?raw imports as SSR dependencies instead of normal style modules, so raw CSS strings rendered with set:html refresh correctly.
Builds on the Astrobot fix from Fix stale inline CSS in server-rendered HTML during dev #16783, with additional coverage for the ?raw import path.

Testing

Added a package integration test that starts an Astro dev server, edits global CSS, and verifies the server-rendered inline <style> output updates.
Added unit coverage for dev CSS virtual module invalidation.
Added unit coverage for *.css?raw imports going through SSR invalidation instead of the normal CSS HMR skip path.
pnpm -C packages/astro run build:ci
pnpm -C packages/astro exec astro-scripts test "test/units/vite-plugin-hmr-reload/hmr-reload.test.ts" --strip-types

Docs

No docs changes. This fixes dev-server HMR behavior without changing user-facing APIs.

…to prevent stale inline styles

changeset-bot · 2026-06-03T09:51:56Z

🦋 Changeset detected

Latest commit: e7487b2

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

This PR includes changesets to release 398 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
@e2e/i18n	Patch
@test/nested-style-bug-e22e	Patch
@e2e/preact-compat-component	Patch
@e2e/preact-component	Patch
@e2e/preact-lazy-component	Patch
@e2e/prefetch	Patch
@e2e/react-component	Patch
@e2e/server-islands-key	Patch
@e2e/server-islands	Patch
@e2e/solid-circular	Patch
@e2e/solid-component	Patch
@e2e/solid-recurse	Patch
@e2e/svelte-component	Patch
@e2e/e2e-tailwindcss	Patch
@e2e/ts-resolution	Patch
@e2e/view-transitions	Patch
@e2e/vite-virtual-modules	Patch
@e2e/vue-component	Patch
@performance/md	Patch
@performance/mdoc	Patch
@performance/mdx	Patch
@test/0-css	Patch
fake-astro-library	Patch
@test/actions	Patch
@test/alias-path-alias-style	Patch
@test/ts-paths-no-baseurl	Patch
@test/aliases-tsconfig	Patch
@test/aliases	Patch
@test/api-routes	Patch
@test/asset-query-params-chunks	Patch
@test/asset-url-base	Patch
@test/astro-pages	Patch
@test/astro-assets-prefix	Patch
@test/astro-assets	Patch
@test/astro-basic	Patch
@test/astro-check-errors	Patch
@test/astro-check-no-errors	Patch
@test/astro-check-watch	Patch
@test/astro-children	Patch
@test/astro-client-only	Patch
@test/astro-component-bundling	Patch
@test/astro-component-code	Patch
@test/astro-css-bundling	Patch
@test/astro-dev-headers	Patch
@test/astro-dev-http2	Patch
@test/astro-doctype	Patch
@test/astro-dynamic	Patch
@test/astro-env-content-collections	Patch
@test/astro-env-required-public	Patch
@test/astro-env-server-fail	Patch
@test/astro-env-server-secret	Patch
@test/astro-env	Patch
@test/astro-envs	Patch
@test/astro-expr	Patch
@test/astro-get-static-paths	Patch
@test/astro-head	Patch
@test/astro-manifest-client-script	Patch
@test/astro-manifest-invalid	Patch
@test/astro-manifest	Patch
@test/astro-markdown-frontmatter-injection	Patch
@test/astro-markdown-plugins	Patch
@test/astro-markdown-remarkRehype	Patch
@test/astro-markdown-skiki-default-color	Patch
@test/astro-markdown-skiki-langs	Patch
@test/astro-markdown-skiki-themes-custom	Patch
@test/astro-markdown-skiki-themes-integrated	Patch
@test/astro-markdown-skiki-wrap-false	Patch
@test/astro-markdown-skiki-wrap-null	Patch
@test/astro-markdown-skiki-wrap-true	Patch
@test/astro-markdown-url	Patch
@test/astro-markdown	Patch
@test/astro-mode	Patch
@test/astro-page-directory-url	Patch
@test/astro-partial-html	Patch
@test/astro-preview-allowed-hosts	Patch
@test/astro-preview-headers	Patch
@test/astro-public	Patch
@test/astro-script-template-dedup	Patch
@test/astro-scripts	Patch
@test/astro-slots-nested	Patch
@test/concurrency	Patch
@test/build-readonly-file	Patch
@test/cache-memory-query-include	Patch
@test/cache-memory-query	Patch
@test/client-address-node	Patch
@test/code-component	Patch
@test/component-library	Patch
@test/config-vite-css-target	Patch
@test/config-vite	Patch
@test/react-container	Patch
@test/content-with-spaces-in-folder-name	Patch
@test/content-collection-picture-render	Patch
@example/content-collection-references	Patch
@test/content-collection-tla-svg	Patch
@test/content-collections-base	Patch
@test/content-collections-empty-dir	Patch
@test/content-collections-empty-md-file	Patch
@test/content-collections-mutation	Patch
@test/content-collections-number-id	Patch
@test/content-collections-type-inference	Patch
@test/content-collections-with-config-mjs	Patch
@test/content-collections	Patch
@test/content-frontmatter	Patch
@test/content-intellisense	Patch
@test/content-layer-loader-schema-function	Patch
@test/content-layer-remark-plugins	Patch
@test/content-layer	Patch
@test/content-ssr-integration	Patch
@test/content-static-paths-integration	Patch
@test/content	Patch
@test/core-image-data-url	Patch
@test/core-image-deletion-ssr	Patch
@test/core-image-deletion	Patch
@test/core-image-errors	Patch
@test/core-image-fs-config	Patch
@test/core-image-remark-infersize	Patch
@test/core-image-layout	Patch
@test/core-image-picture-emit-file	Patch
@test/core-image-remark-imgattr	Patch
@test/core-image-ssg	Patch
@test/core-image-ssr	Patch
@test/core-image-svg-in-client	Patch
@test/core-image-svg	Patch
@test/core-image-unconventional-settings	Patch
@test/core-image	Patch
@test/csp-adapter	Patch
@test/csp-fonts	Patch
@test/csp	Patch
@test/css-assets	Patch
@test/css-dangling-references	Patch
@test/css-deduplication	Patch
@test/css-double-bundle	Patch
@test/css-dynamic-import-dev	Patch
@test/css-import-as-inline	Patch
@test/css-inline-stylesheets	Patch
@test/css-no-code-split	Patch
@test/css-path-case	Patch
@test/css-pure-chunk-query-params	Patch
@test/custom-404-injected-from-dep	Patch
@test/custom-404-pkg	Patch
custom-fetch-error-pages	Patch
@test/custom-renderer	Patch
@test/data-collections-schema	Patch
@test/data-collections	Patch
@test/debug-component	Patch
@test/dev-container	Patch
@test/dev-render	Patch
@test/dev-request-url	Patch
@test/dynamic-endpoint-collision	Patch
@test/dynamic-route-build-file	Patch
@test/endpoint-routing	Patch
@test/error-bad-js	Patch
@test/error-build-location	Patch
@test/error-non-error	Patch
@test/extension-matching	Patch
@test/fetch	Patch
@test/fonts	Patch
@test/astro-fontsource-package	Patch
@test/get-static-paths-pages	Patch
@test/glob-pages-css	Patch
@test/head-propagation-prerender-env	Patch
@test/hmr-markdown	Patch
@test/hmr-new-page	Patch
@test/hmr-slots-render	Patch
@test/hoisted-imports	Patch
@test/html-component	Patch
@test/html-escape	Patch
@test/html-page	Patch
@test/html-slots	Patch
@test/hydration-race	Patch
@test/i18n-client-import	Patch
@test/i18n-css-leak-basic	Patch
@test/import-ts-with-js	Patch
@test/impostor-md-file	Patch
@test/integration-add-page-extension	Patch
@test/integration-server-setup	Patch
@test/jsx-queue-rendering	Patch
@test/large-array-solid	Patch
@test/legacy-collections-backwards-compat	Patch
@test/lightningcss-scoped-nesting	Patch
@test/live-loaders	Patch
@test/markdown	Patch
@test/middleware-dev	Patch
@test/middleware-full-ssr	Patch
@test/middleware-no-user-middlewaqre	Patch
@test/middleware-tailwind	Patch
@test/minification-html-jsx	Patch
@test/minification-html	Patch
@test/non-ascii-path	Patch
@test/non-html-pages	Patch
@test/page-format	Patch
@test/page-level-styles	Patch
@test/parallel-components	Patch
@test/partials-css-boundary	Patch
@test/partials	Patch
@test/passthrough-image-service	Patch
@test/postcss	Patch
@test/preact-compat-component	Patch
@test/preact-component	Patch
@test/remote-css	Patch
@test/request-signal	Patch
@test/reuse-injected-entrypoint	Patch
@test/root-srcdir-css	Patch
@test/scoped-style-strategy	Patch
@test/server-entry-fake-adapter	Patch
@test/server-entry	Patch
@test/server-islands-hybrid	Patch
@test/server-islands-ssr	Patch
@test/sessions	Patch
@test/slots-preact	Patch
@test/slots-react	Patch
@test/slots-solid	Patch
@test/slots-svelte	Patch
@test/slots-vue	Patch
@test/solid-component	Patch
@test/sourcemap	Patch
@test/space-in-folder-name	Patch
@test/special-chars-in-component-imports	Patch
@test/ssr-assets	Patch
@test/ssr-dynamic	Patch
@test/ssr-partytown	Patch
@test/ssr-prerender-get-static-paths	Patch
@test/ssr-prerender	Patch
@test/ssr-preview	Patch
@test/ssr-renderers-static-vue	Patch
@test/ssr-request	Patch
@test/ssr-hoisted-script	Patch
@test/ssr-scripts	Patch
@test/static-build-code-component	Patch
@test/static-build-dir	Patch
@test/static-build-frameworks	Patch
@test/static-build-page-url-format	Patch
@test/static-build-ssr	Patch
@test/static-build	Patch
@test/static-redirect	Patch
@test/svelte-component	Patch
@test/svg-deduplication	Patch
@test/tailwindcss	Patch
@e2e/third-party-astro	Patch
@test/url-import-suffix	Patch
@test/view-transitions	Patch
@test/virtual-astro-file	Patch
@test/vitest	Patch
@test/vue-component	Patch
@test/vue-with-multi-renderer	Patch
@test/db-aliases	Patch
@test/db-db-in-src	Patch
@test/error-handling	Patch
@test/db-integration-only	Patch
@test/db-integration	Patch
@test/db-libsql-remote	Patch
@test/db-local-prod	Patch
@test/db-no-apptoken	Patch
@test/db-no-seed	Patch
@test/recipes	Patch
@test/db-static-remote	Patch
@test/alpinejs-basics	Patch
@test/alpinejs-directive	Patch
@test/alpinejs-plugin-script-import	Patch
@test/astro-cloudflare-allowed-hosts	Patch
@test/astro-cloudflare-astro-dev-platform	Patch
@test/astro-cloudflare-astro-env	Patch
@test/astro-cloudflare-binding-image-service	Patch
@test/astro-cloudflare-cache-provider-wait-until	Patch
@test/astro-cloudflare-client-address	Patch
@test/astro-cloudflare-compile-image-service	Patch
@test/astro-cloudflare-custom-entryfile	Patch
@test/astro-cloudflare-dev-image-endpoint	Patch
@test/astro-cloudflare-external-image-service	Patch
@test/astro-cloudflare-external-redirects	Patch
@test/astro-cloudflare-internal-redirects	Patch
@test/astro-cloudflare-no-output	Patch
@test/astro-cloudflare-prerender-node-env	Patch
@test/astro-cloudflare-prerender-queue-consumers	Patch
@test/astro-cloudflare-prerender-styles	Patch
@test/astro-cloudflare-prerenderer-errors	Patch
@test/routing-priority-cloudflare	Patch
@test/cf-server-entry	Patch
@test/astro-cloudflare-server-island-prerender-framework	Patch
@test/astro-cloudflare-sql-import	Patch
@test/cf-ssr-deps	Patch
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@test/astro-cloudflare-svelte-rune-deps	Patch
@test/astro-cloudflare-top-level-return	Patch
@test/cf-user-optimize-deps	Patch
@test/astro-cloudflare-vite-plugin	Patch
@test/astro-cloudflare-with-base	Patch
@test/astro-cloudflare-with-react	Patch
@test/astro-cloudflare-with-solid-js	Patch
@test/astro-cloudflare-with-svelte	Patch
@test/astro-cloudflare-with-vue	Patch
@test/astro-cloudflare-wrangler-preview-platform	Patch
@test/markdoc-content-collections	Patch
@test/content-layer-markdoc	Patch
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@test/image-assets-custom	Patch
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@test/markdoc-propagated-assets	Patch
@test/markdoc-render-with-space	Patch
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@test/markdoc-render-partials	Patch
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@test/image-remark-imgattr	Patch
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@test/mdx-frontmatter-injection	Patch
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…t/astro into global-css-hmr-fix

codspeed-hq · 2026-06-03T10:14:39Z

Merging this PR will not alter performance

✅ 18 untouched benchmarks

_{Comparing thelazylamaGit:global-css-hmr-fix (e7487b2) with main (132a879)¹}

No successful run was found on main (ca26d0e) during the generation of this report, so 132a879 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

This PR contains the following updates: | Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---| | [astro](https://astro.build) ([source](https://github.com/withastro/astro/tree/HEAD/packages/astro)) | [`6.4.6` → `6.4.7`](https://renovatebot.com/diffs/npm/astro/6.4.6/6.4.7) | ![age](https://developer.mend.io/api/mc/badges/age/npm/astro/6.4.7?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/astro/6.4.6/6.4.7?slim=true) | --- ### Release Notes <details> <summary>withastro/astro (astro)</summary> ### [`v6.4.7`](https://github.com/withastro/astro/blob/HEAD/packages/astro/CHANGELOG.md#647) [Compare Source](https://github.com/withastro/astro/compare/astro@6.4.6...astro@6.4.7) ##### Patch Changes - [#17035](withastro/astro#17035) [`197e50e`](withastro/astro@197e50e) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes `getRelativeLocaleUrl`, `getAbsoluteLocaleUrl`, and `getAbsoluteLocaleUrlList` to strip trailing slashes when `trailingSlash: 'never'` is configured - [#16967](withastro/astro#16967) [`3719765`](withastro/astro@3719765) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes double URL-encoded paths returning 400 Bad Request on on-demand routes Previously, any URL containing a double-encoded character (like `%255B`, which is `[` encoded twice) was unconditionally rejected with a `400 Bad Request` before middleware or route handlers could run. This broke embedded tools like Sanity Studio whose client-side router legitimately produces double-encoded URLs. The fix replaces the rejection approach with iterative decoding — multi-level percent-encoding is now fully resolved to its canonical form before being passed to middleware and route matching. This preserves the security fix for CVE-2025-66202 (middleware authorization bypass via double encoding) because middleware now always sees the fully decoded path, making bypass impossible. For example, `/api/%2561dmin` is decoded to `/api/admin`, which middleware can correctly block. - [#17066](withastro/astro#17066) [`2f4d92a`](withastro/astro@2f4d92a) Thanks [@matthewp](https://github.com/matthewp)! - Fixes prerendered redirect targets being incorrectly bundled into the SSR function in hybrid mode, causing massive bundle size inflation - [#16882](withastro/astro#16882) [`621beb7`](withastro/astro@621beb7) Thanks [@jettwayio](https://github.com/jettwayio)! - fix(render): honour compressHTML when joining head elements - [#16892](withastro/astro#16892) [`8d753b0`](withastro/astro@8d753b0) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes custom elements in MDX having their children's `slot` attribute stripped by the JSX runtime When custom elements (tags with hyphens like `<my-element>`) are used in MDX files, the `slot` HTML attribute on their children is now correctly preserved. Previously, the shared JSX runtime would treat `slot` as an Astro slot assignment and remove it from the output, breaking Shadow DOM named slot distribution for web components. - [#16957](withastro/astro#16957) [`544ee76`](withastro/astro@544ee76) Thanks [@thelazylamaGit](https://github.com/thelazylamaGit)! - Fixes stale inline CSS in server-rendered HTML after CSS file edits during dev When editing a CSS file (`.css`, `.scss`, etc.) during development, the inline `<style>` tags in server-rendered HTML would retain old CSS content instead of updating. This caused a brief flash of old CSS (FOUC) on fresh page loads before Vite's client-side HMR corrected the styles. The fix ensures that Astro's per-route dev CSS virtual modules are invalidated in both the SSR module graph and the module runner's evaluation cache when a style file changes, so the next page render picks up the fresh CSS. - [#17044](withastro/astro#17044) [`2220d22`](withastro/astro@2220d22) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes CSS from `client:only` islands leaking to unrelated pages when Rollup bundles non-CSS-importing modules into the same chunk as CSS-importing modules - [#17040](withastro/astro#17040) [`7c4763d`](withastro/astro@7c4763d) Thanks [@astrobot-houston](https://github.com/astrobot-houston)! - Fixes HMR not triggering for files inside the `src/middleware/` directory during dev - [#16672](withastro/astro#16672) [`52fc862`](withastro/astro@52fc862) Thanks [@martinheidegger](https://github.com/martinheidegger)! - Fixes support for numeric IDs in YAML frontmatter when using content collection references - [#16762](withastro/astro#16762) [`9de80ae`](withastro/astro@9de80ae) Thanks [@alexanderdombroski](https://github.com/alexanderdombroski)! - Adds a JSON schema to the Wrangler configuration file generated when running `astro add cloudflare` - [#17046](withastro/astro#17046) [`ef771ec`](withastro/astro@ef771ec) Thanks [@ematipico](https://github.com/ematipico)! - Improves the diagnostics emitted when Astro parses incorrect `.astro` files. </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. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).

astrobot-houston and others added 17 commits May 19, 2026 07:55

fix(dev): invalidate SSR dev-css virtual modules on CSS file changes …

835502c

…to prevent stale inline styles

Update hmr-reload.test.ts

e2b0473

Update hmr-css-invalidation.test.ts

8cd8283

Update hmr-css-invalidation.test.ts

3c5ec22

Create css-dev-css-hmr.test.ts

86fa656

Create astro.config.mjs

0985851

Create [slug].astro

16661d8

Create global.css

38f5e21

Update css-dev-css-hmr.test.ts

f2fd9b3

Fix Lint errors css-dev-css-hmr.test.ts

29d8d82

fix fixture paths

e0b719b

fix fixture path

dd978a4

delete old path

54965cc

delete old path

eb5b07d

Merge branch 'pr/16783' into global-css-hmr-fix

7061e58

Merge branch 'flue/fix-16780' into global-css-hmr-fix

33f9d32

cover ?raw css imports with srr invalidation

a50292f

github-actions Bot added the pkg: astro Related to the core `astro` package (scope) label Jun 3, 2026

thelazylamaGit and others added 3 commits June 3, 2026 19:51

Merge branch 'main' into global-css-hmr-fix

581b130

add comments

df08581

Merge branch 'global-css-hmr-fix' of https://github.com/thelazylamaGi…

5627316

…t/astro into global-css-hmr-fix

thelazylamaGit mentioned this pull request Jun 3, 2026

Clean up CSS HMR invalidation tests #16824

Closed

thelazylamaGit and others added 3 commits June 6, 2026 22:51

Merge branch 'main' into global-css-hmr-fix

11aa5c0

fix test: expect [] instead of undefined

b805001

Merge branch 'main' into global-css-hmr-fix

e7487b2

matthewp approved these changes Jun 10, 2026

View reviewed changes

matthewp merged commit 544ee76 into withastro:main Jun 10, 2026
29 checks passed

matthewp mentioned this pull request Jun 10, 2026

Fix stale inline CSS in server-rendered HTML during dev #16783

Closed

astrobot-houston mentioned this pull request Jun 10, 2026

[ci] release #17036

Merged

thelazylamaGit mentioned this pull request Jun 15, 2026

Issue with HMR for ?raw advanced CSS imports #17032

Closed

1 task

astrobot-houston mentioned this pull request Jun 15, 2026

Problem in Astro 6: CSS updates during dev server do not fully reset previous style state after reload (only in Astro 6 not 5!) #17083

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1 task

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fix(dev): refresh stale CSS during HMR#16957

fix(dev): refresh stale CSS during HMR#16957
matthewp merged 23 commits into
withastro:mainfrom
thelazylamaGit:global-css-hmr-fix

thelazylamaGit commented Jun 3, 2026 •

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changeset-bot Bot commented Jun 3, 2026 •

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codspeed-hq Bot commented Jun 3, 2026 •

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thelazylamaGit commented Jun 3, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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changeset-bot Bot commented Jun 3, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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codspeed-hq Bot commented Jun 3, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Merging this PR will not alter performance

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thelazylamaGit commented Jun 3, 2026 •

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changeset-bot Bot commented Jun 3, 2026 •

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codspeed-hq Bot commented Jun 3, 2026 •

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