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fix(core): preload the normalized pathname before hydrating (AI-assisted) - #12810
Opening a page at a non-canonical URL, like /tests.html or /tests/index.html, can render it twice: React keeps the server HTML and appends a client render after it.
Root cause:
clientEntry preloads the raw window.location.pathname, but App renders the normalized location, without the .html or /index.html suffix. The route chunk isn't loaded before hydrating, so the route renders @theme/Loading (null).
For routes whose whole layout lives in the route component (pages, blog, homepage), the first client render at the root is empty.
This PR preloads the pathname that App renders: decoded like the router does, then normalized. Hydration then renders the same route as the server. It's an alternative to #10059 that doesn't change the DOM structure: it's not a breaking change, and can be backported to v3.
Test Plan
Unit tests for the new normalizeBrowserPathname() helper, including an encoded .html route (/caf%C3%A9.html) and a pathname that must stay decodable (/100%25.html).
Tested manually on a local website build, served without clean URLs, with a 404.html fallback (like Netlify):
With trailingSlash: true (the deploy preview config), /tests/index.html, /index.html, /blog/index.html and /docs/installation/index.html hydrate without error.
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Walkthrough
The client now exports and tests pathname normalization. It applies normalization to the browser pathname before route preloading.
Changes: Pathname normalization
Layer / File(s)
Summary
Path normalization and tests packages/docusaurus/src/client/normalizeLocation.ts, packages/docusaurus/src/client/__tests__/normalizeLocation.test.ts
normalizePathname caches normalized paths. normalizeLocation uses it and returns a copied location. Tests cover index and HTML paths, including encoded characters.
Normalize paths before preload packages/docusaurus/src/client/clientEntry.tsx
clientEntry passes the normalized browser pathname to preload before rendering.
meta/docusaurus#12801: It changes the shared react-router-dom catalog used by the router contract involved in route matching.
Merge Risk: Minimal · previous review 18f81
Encoded routes are matched safely through the existing preload candidates, with no established merge-blocking issue.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
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Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
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The title clearly and specifically describes the main change: preloading the normalized pathname before hydration. The “AI-assisted” suffix is unnecessary but does not make the title misleading.
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Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Inline comments:
Review comments at @packages/docusaurus/src/client/clientEntry.tsx:
- Line 69: Update the clientEntry preload flow to decode the pathname once
before normalization, and ensure preload does not decode that already-decoded
input again. Preserve router-equivalent matching for encoded .html routes and
prevent a second decode from throwing on paths containing %25; add regression
tests for both cases.
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…isted)
Regression test for exact .html routes with encoded characters: the
browser URL is /caf%C3%A9.html while the router decodes it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…I-assisted)
docusaurus serve redirects /page.html URLs, so serve the HTML file the
way Netlify does to reproduce the duplicate render of the app.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ted)
Accessing /page.html loaded the chunks of the wrong route: the first render
was empty, and React kept the server HTML next to the client render.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…sted)
The router decodes the pathname, so exact .html routes with encoded
characters, like /café.html, kept their extension in App but not in the
preloaded pathname.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…repro (AI-assisted)
The blog post appeared in the sidebar of every dogfood blog page in the
Argos dev build. Like dummy.html, the doc is in no sidebar.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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ArgosAdd this label to run UI visual regression tests. See argos.yml GH action.CLA SignedSigned Facebook CLApr: bug fixThis PR fixes a bug in a past release.
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Motivation
Opening a page at a non-canonical URL, like
/tests.htmlor/tests/index.html, can render it twice: React keeps the server HTML and appends a client render after it.Root cause:
clientEntrypreloads the rawwindow.location.pathname, butApprenders the normalized location, without the.htmlor/index.htmlsuffix. The route chunk isn't loaded before hydrating, so the route renders@theme/Loading(null).This PR preloads the pathname that
Apprenders: decoded like the router does, then normalized. Hydration then renders the same route as the server. It's an alternative to #10059 that doesn't change the DOM structure: it's not a breaking change, and can be backported to v3.Test Plan
Unit tests for the new
normalizeBrowserPathname()helper, including an encoded.htmlroute (/caf%C3%A9.html) and a pathname that must stay decodable (/100%25.html).Tested manually on a local website build, served without clean URLs, with a
404.htmlfallback (like Netlify):/tests.html/blog.html,/index.html/docs/installation.html/tests/index.html,/blog/index.html404.htmlWith
trailingSlash: true(the deploy preview config),/tests/index.html,/index.html,/blog/index.htmland/docs/installation/index.htmlhydrate without error.Test links
Deploy preview: https://deploy-preview-12810--docusaurus-2.netlify.app/
These URLs render the page twice on
main(compare with the deploy preview of #12805), and once here, without hydration error:main, but a hydration error)Related issues/PRs
Alternatives to this PR, for comparison:
<div id="__docusaurus-app">(breaking change)<Suspense>boundary🤖 Generated with Claude Code