fix: skip script downloads for unused components - #884
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📝 WalkthroughWalkthroughThe transformer receives the runtime components directory and defers script downloads for auto-registered components until Vite resolves the final module graph. Recursive importer traversal handles nested imports, cycles, and dynamic imports. Unused components retain source URLs. Final chunks remove integrity placeholders and related Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The current implementation can leave placeholder URLs in later or watch-build output when no pending component bundles remain, so merge should wait until replacements are applied consistently and the fallback behavior is properly exercised. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The implementation addresses issue ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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📦 Package Size📚 22 runtime dependencies (no change)
All tracked output (27)
Runtime dependencies (22)
Baseline: main_@_9368f012___2026-08-24 · gzip is the comparison metric · changes below 16 B gzip are ignored |
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…ndle falls back to remote src
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Inline comments:
In `@packages/script/src/plugins/transform.ts`:
- Around line 347-355: Update the unused-component check around getModuleInfo in
the renderStart flow to recursively traverse both importers and
dynamicImporters, including cycles protection, and classify a component as
reachable only when an importer path reaches an application module; prevent
resolveScriptBundle and subsequent downloads for unreachable components. Add a
regression case covering unreferenced UnusedParent.vue importing Tracker.vue,
asserting Tracker.vue does not start a download during renderStart.
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packages/script/src/plugins/transform.tstest/unit/render-start-concurrent-downloads.test.ts
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Actionable comments posted: 2
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Inline comments:
In `@packages/script/src/plugins/transform.ts`:
- Around line 398-441: Update generateBundle so pendingComponentBundles
resolution is conditional rather than returning early, allowing every emitted
chunk to be patched whenever replacements is non-empty. Preserve the existing
resolution and cleanup behavior, then apply replacements across all bundle
chunks on subsequent emissions as well. Add a regression test covering two
bundle emissions where the second emission has no pending component bundles but
still receives replacement patches.
In `@test/unit/bundle-placeholder-minification.test.ts`:
- Line 39: Update deferAndMinify and the fallback test graph so getModuleInfo
returns importer arrays linking an application module outside COMPONENT_DIR to
COMPONENT_ID; make the download fail and assert that resolveScriptBundle uses
the REMOTE_SRC fallback. Replace the invalid { [COMPONENT_ID]: {} } graph entry
with a type-compatible module-info shape.
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📒 Files selected for processing (7)
packages/script/src/plugins/transform.tstest/e2e/issue-882-unused-widget.test.tstest/e2e/issue-882-used-widget.test.tstest/unit/bundle-component-integrity.test.tstest/unit/bundle-component-reachability.test.tstest/unit/bundle-placeholder-minification.test.tstest/unit/render-start-concurrent-downloads.test.ts
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Patching moved out of generateBundle. File names are already fixed there, so
an upstream script change shipped new chunk code under an old cache-busted
name, and the shifted offsets left the emitted sourcemap wrong. renderChunk
runs before the bundler hashes the chunk and can return a map, so both stay
honest. Resolution is awaited inside renderChunk too, which is what
generateBundle was working around.
Component registrations are now keyed by module id and survive every emission:
- Reachability is decided against the module graph of the build being emitted,
so a watch rebuild that adds or drops an importer no longer reuses the first
build's verdict.
- A failed build consumes nothing, so the retry resolves the same components
instead of shipping unresolved placeholders.
- Re-transforming a module replaces its own registrations, retiring the token
of a src that changed.
Replacements swap the whole quoted literal and serialize the value with
JSON.stringify. A registry or user src can hold a quote, a backslash or `${`,
and the minifier picks the quote style, so splicing raw text into an existing
literal could emit broken JavaScript.
Patch patterns are re-instantiated per chunk: chunks render concurrently and a
global RegExp carries lastIndex between matches. Edits are collected, sorted
and applied without overlaps, which MagicString rejects.
The issue-882-used fixture now builds with client sourcemaps so CI exercises
the map path.
Claude-Session: https://claude.ai/code/session_018cCJ2TMLa1tyT1ttEu1L5v
Every auto-registered widget contributes a patch, and a build with selective client islands registers all of them. Patching one chunk ran a full regex scan per patch, so the cost of a chunk grew with the number of widgets in the app. An indexOf check rules a patch out first, and a chunk holds the tokens of one or two widgets. Measured on a chunk carrying one widget's placeholders, 19 components registered (38 patches): 200 kB chunk 0.65 ms -> 0.08 ms 1 MB chunk 3.03 ms -> 0.48 ms Pattern construction moved into urlPatch and integrityRemovalPatch so a patch cannot be built without the token that guards it. Claude-Session: https://claude.ai/code/session_018cCJ2TMLa1tyT1ttEu1L5v
Vite builds the client and ssr environments from one config, so the plugin factory runs once and both environments shared `patches` and `resolution`. A chunk read whichever verdict resolved most recently. The environments run serially today, so nothing was miscompiled, but the coupling was silent and a parallel environment build would have swapped one environment's patch set into the other's chunks. Resolution is now keyed by environment name, and `renderChunk` reads its patch set from the promise it awaits rather than from a field another environment can replace mid-render. A surviving placeholder now fails the build. A token that reaches the browser ships as a script `src` or an SRI hash and breaks at runtime, where it is far harder to trace. The error names the chunk, the token, the component and the src behind it. Claude-Session: https://claude.ai/code/session_018cCJ2TMLa1tyT1ttEu1L5v
A widget used only through `nuxt-client` inside a server component stopped being bundled. Reachability reads the client module graph, and there every auto-registered component is an entry with no importers, identical for a used and an unused widget. Only the ssr graph shows the importer, and it builds second, so the client build cannot reach the right verdict on its own. Two changes make that recoverable: - `scripts.assets.alwaysBundle` bundles a named component regardless of what the graph proves. Pass `true` to skip the check for every component. - When one environment finds a component reachable after another judged it unused, the build warns, names the component and its src, and says which option to set. The earlier environment has already written its chunks, so this is reported rather than repaired. Covered by a fixture whose widget is reachable only from a `.server.vue` component through `nuxt-client`. Without `alwaysBundle` that build emits no bundled asset at all. Claude-Session: https://claude.ai/code/session_018cCJ2TMLa1tyT1ttEu1L5v
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🔗 Linked issue
Resolves #882
📚 Description
With selective client islands enabled, Nuxt builds every auto-registered component. That made unused Nuxt Scripts widgets download third-party SDKs and fail builds without internet access. Downloads now run only for components imported by the app.