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Re-swizzle theme components after upgrading Docusaurus from 3.1.1 to 3.10.2:
- DocItem/Content: update useDoc import to @docusaurus/plugin-content-docs/client
- DocSidebarItem/Category: rewrite to match new structure (useVisibleSidebarItems,
CategoryLinkLabel, DocSidebarItemCategoryEmpty, new handleItemClick logic,
updated aria attributes); add styles.module.css; preserve expComponentBadge/
newComponentBadge custom logic
Fix playground-elements runtime error ("Cannot find module 'http://localhost:3000/'"):
- Patch playground-project.js to replace import.meta.url with location.href in
_normalizedSandboxBaseUrl — Webpack 5 statically analyzed import.meta.url and
injected a broken module context; location.href is equivalent since sandboxBaseUrl
is always an absolute URL
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ilhan007
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Jul 16, 2026
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Summary
Docusaurus swizzle updates
DocItem/Content/index.jsuseDocimport:@docusaurus/theme-common/internal→@docusaurus/plugin-content-docs/clientDocSidebarItem/Category/index.js+ newstyles.module.cssRewritten to match the 3.10.2 base structure:
useVisibleSidebarItems— handles categories with no visible children viaDocSidebarItemCategoryEmptyCategoryLinkLabelcomponent wrapping label in a<span>for CSS-controlled text truncationhandleItemClicklogic with smarter collapse/expand behavior (collapses on current page, always expands on navigation)aria-expanded/roleattributes on the link elementstyles.module.css(new in 3.10.2) with.categoryLinkand.categoryLinkLabelclassesexpComponentBadge/newComponentBadgeclass logic on the<li>elementplayground-elements fix
Error:
Uncaught Error: Cannot find module 'http://localhost:3000/'thrown from_normalizedSandboxBaseUrlon every component page with a code sample.Root cause:
playground-project.jsusedimport.meta.urlas the base fornew URL(this.sandboxBaseUrl, import.meta.url). Webpack 5 interceptsimport.meta.urlat bundle time and injects a dynamicrequire()context — buthttp://localhost:3000/is not a valid module path, so it throws at runtime.Fix: Patched
playground-project.jsvia.yarn/patches/playground-elements-npm-0.18.1-d292eadd94.patchto replaceimport.meta.urlwithlocation.hrefin_normalizedSandboxBaseUrl. This is safe becausesandboxBaseUrlis always set to an absolute URL before use (eitherhttps://unpkg.com/playground-elements@0.18.1/in production orwindow.location.origin + "/"in development), making the base argument tonew URL()irrelevant.