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fix(rendering): scope render cache and MDX modules by compile mode - #3848
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📝 WalkthroughWalkthroughThe change adds explicit development and production compile modes to render cache keys and MDX loading. It propagates mode through rendering paths and isolates transformed MDX artifacts by compile variant. ChangesRender compile-mode isolation
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The PR separates render and MDX caches by compile mode, but legacy cache keys beginning with cdev or cprod may be interpreted incorrectly, so the format should be made unambiguous before merging. Newly added compile-mode tests also rely on Deno-specific APIs, which can leave Node and Bun without equivalent coverage. Sequence Diagram(s)sequenceDiagram
participant RenderContext
participant PageRenderer
participant loadModuleESM
participant processVfModuleImports
participant MDXArtifactCache
RenderContext->>PageRenderer: provide render mode
PageRenderer->>loadModuleESM: pass mode
loadModuleESM->>processVfModuleImports: create loader context
processVfModuleImports->>MDXArtifactCache: use mode-specific cache variant
MDXArtifactCache-->>loadModuleESM: return matching artifact
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loadMDXLayout is a fourth caller of loadModuleESM, reached from applyLayoutsESM and from the layout preload in the orchestrator when experimental.esmLayouts is on. It named no render mode, so a layout's own /_vf_modules/* imports compiled one way while the page wrapping them compiled the other. LayoutOrchestrator and applyLayoutsESM already carry the mode, so pass it through preloadMDXLayoutModule, applyMDXLayout and loadMDXLayout. Reported by the Codex reviewer on #3848. Refs veryfront/veryfront-issue-inbox#555
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Merging at 88/90/89. Two verifiers cleared this with zero blockers on cross-mode serving and on behaviour; the 88 reflects test coverage of three seams, not a correctness problem, and the production issue it fixes (hosted MDX shipping unminified with inline sourcemaps, plus the render-cache prefix collision) is live. The seam guards land as a separate PR. The gaps, for the record:
This is the third PR in this area where reverting a changed file left the suite green (also #3841 and #3845), so the follow-up will also test for a wrong-slot argument, not just a missing one: |
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Follow-up to #3841, #3844 and #3845. Three items from the #3845 review are live on main. Site C, hosted production MDX pages. `loader-helpers.ts` passed an explicit `dev: true` for every `/_vf_modules/*` import of a compiled-MDX entry, and both `rendering/page-rendering.ts` and the RSC `render-handler.ts` reach that path on a hosted production render. `ESMLoaderContext` had no mode field, so the render mode could not be threaded. It has one now, both call sites pass it, and a context that names no mode compiles for production. Measured on a probe module: development emits 1031 bytes with an inline sourcemap, retained dead code and unminified identifiers; production emits 220 bytes with none of those, and the two land on different cache keys. The render cache identity. `buildRenderCachePrefix` took the project, the "preview" | "production" environment and the release key, none of which imply the compile mode. `isLocalProject` decides the compile mode and never reached the prefix, so a local development server and a hosted preview server for the same project and branch both produced `<project>:preview:main:<version>`. A cached render carries its hydration bundle (`cachedClientModule` in `handleComponentPage`, fed from `cachedResult.pageModule`), so a development-compiled bundle could be served straight out of the render cache to a production-mode render, around the hydration-cache fix in #3845. The prefix now carries a required compile-mode segment, `parseRenderCacheKey` reads it back, and both prefix builders derive it from the same value they already use for `mode`. Both modes gain the segment, so entries written under the old prefix shape cannot be misread after deploy; they age out like any `VERSION` roll. The cache-namespace invariant. `buildMdxEsmCacheSchemaSample` names the compile-mode variant only to roll `MDX_ESM_CACHE_NAMESPACE`, and that roll is the only thing keeping a production render off a legacy, always development-compiled entry. Every test referenced the namespace symbolically, so deleting the line reopened the hole silently. The sample builder is now exported and a test rebuilds the pre-roll namespace from it, then asserts no current production key can reach that namespace. It asserts the isolation property, not the hash. Tests now pin the compile mode through the five #3845 source files that nothing detected a regression in. Reverting each one to its pre-#3845 state fails at least one test. Refs veryfront/veryfront-issue-inbox#555
The new compile-mode tests persist two artifacts, and persistTransformedModule publishes the _index.json write without awaiting it. Two of those in one test left a write op in flight at the end of the test and Deno's leak detector failed the file. Await the index write, and assert the two artifacts' contents while doing it.
loadMDXLayout is a fourth caller of loadModuleESM, reached from applyLayoutsESM and from the layout preload in the orchestrator when experimental.esmLayouts is on. It named no render mode, so a layout's own /_vf_modules/* imports compiled one way while the page wrapping them compiled the other. LayoutOrchestrator and applyLayoutsESM already carry the mode, so pass it through preloadMDXLayoutModule, applyMDXLayout and loadMDXLayout. Reported by the Codex reviewer on #3848. Refs veryfront/veryfront-issue-inbox#555
#3847 renamed the applicator parameter to modes: RenderModes while this branch was adding a mode argument to applyMDXLayout, so the merge group failed ci (typecheck) with TS2552 at applicator.ts:94 and :162 even though each side typechecked alone. applyMDXLayout takes the compile vocabulary, so pass modes.compileMode. Refs veryfront/veryfront-issue-inbox#555
Reverting src/transforms/mdx/index.ts, src/rendering/layouts/utils/applicator.ts or src/rendering/orchestrator/layout.ts left every suite green, so the compile mode could stop reaching the MDX ESM loader without a test noticing. Drive each seam from its narrowest real entry point and assert the compile mode observed below it: - MDXRenderer.loadModuleESM loads a real compiled entry that imports one /_vf_modules module and the module cache keys prove which compile mode the loader used. - applyLayoutsESM and LayoutOrchestrator.preloadLayoutModules assert the mode each MDX layout load receives, including a hosted preview render whose compile mode and environment disagree, so passing the request vocabulary in place of the compile vocabulary fails. Each test also pins the arguments neighbouring the mode, because these call sites are positional chains long enough that a value in the wrong slot still type-checks. Refs veryfront/veryfront-issue-inbox#555
#3847 made environment a required PageRenderer option while this branch was adding the compile-mode probe, so the rebased branch failed the test-typecheck gate with TS2345 even though each side typechecked alone. Name the hosted preview pair, which also makes the production case prove that the compile vocabulary is what reaches the loader. Refs veryfront/veryfront-issue-inbox#555
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Inline comments:
In `@src/cache/keys/utils.ts`:
- Around line 65-78: The parsing logic around isRenderCompileModeSegment must
distinguish the new compile-mode format from legacy keys instead of inferring
solely from the first content segment. Add an unambiguous format discriminator
or use the key version to select the compile-mode parsing branch, preserving
legacy content such as cdev:page:index as the full contentKey with no
compileMode; add a regression test covering that legacy shape.
In `@src/transforms/mdx/esm-module-loader/loader-helpers.test.ts`:
- Around line 93-127: Remove direct Deno filesystem, temporary-directory, and
cleanup usage from the tests around processVfModuleImports in
src/transforms/mdx/esm-module-loader/loader-helpers.test.ts#L93-L127, the
render-handler test in
src/server/services/rsc/orchestrators/render-handler.test.ts#L336-L383, and the
module-persistence test in
src/rendering/orchestrator/module-loader/module-persistence.test.ts#L111-L169.
Replace these calls with runtime-neutral filesystem and temporary-directory
utilities so the tests remain eligible for Node and Bun, without changing their
existing behavior or cleanup.
Apply the same fix in `@src/rendering/orchestrator/module-loader/index.test.ts`
around lines 342 - 462: This pre-existing Deno usage is explicitly excluded from
the new finding.
In `@tests/rendering/render-context.test.ts`:
- Around line 124-148: Move the render-context test suite, including the test
named “separates the local development render cache from the hosted preview
cache,” from its current test location to
src/rendering/context/render-context.test.ts, preserving all existing test cases
and assertions without deleting or altering coverage.
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📒 Files selected for processing (31)
src/cache/keys.test.tssrc/cache/keys/builders/render.tssrc/cache/keys/index.tssrc/cache/keys/render-compile-mode.tssrc/cache/keys/utils.tssrc/rendering/context/render-context.tssrc/rendering/layouts/utils/applicator.tssrc/rendering/layouts/utils/component-loader.test.tssrc/rendering/layouts/utils/component-loader.tssrc/rendering/orchestrator/layout.tssrc/rendering/orchestrator/module-loader/index.test.tssrc/rendering/orchestrator/module-loader/module-cache-lookup.test.tssrc/rendering/orchestrator/module-loader/module-persistence.test.tssrc/rendering/page-renderer.tssrc/rendering/page-rendering.test.tssrc/rendering/page-rendering.tssrc/rendering/renderer.test.tssrc/rendering/renderer.tssrc/server/context/enriched-context.test.tssrc/server/context/enriched-context.tssrc/server/services/rsc/orchestrators/render-handler.test.tssrc/server/services/rsc/orchestrators/render-handler.tssrc/transforms/README.mdsrc/transforms/mdx/esm-module-loader/cache-format.test.tssrc/transforms/mdx/esm-module-loader/cache-format.tssrc/transforms/mdx/esm-module-loader/loader-helpers.test.tssrc/transforms/mdx/esm-module-loader/loader-helpers.tssrc/transforms/mdx/esm-module-loader/module-fetcher/cache-keys.tssrc/transforms/mdx/esm-module-loader/types.tssrc/transforms/mdx/index.tstests/rendering/render-context.test.ts
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…e probe The probe writes its project fixture with the portable helpers already imported here, so the Node and Bun test runs keep the file. Refs veryfront/veryfront-issue-inbox#555
`tests/rendering/render-context.test.ts` and `src/rendering/context/render-context.test.ts` both covered the same module. Merge the former into the latter so the suite sits next to its source, as the repository guide requires, and so the Node and Bun runners see it at all: their patterns select `src/`, not `tests/`. Every case is preserved. `cspUserHeader` is dropped from the two handler-context fixtures because `HandlerContext` has no such property; the moved file was never typechecked in its old location and nothing read the value. Refs veryfront/veryfront-issue-inbox#555
The Node and Bun runners drop any test file whose source names the `Deno.` namespace, so the compile-mode coverage this branch added only ran under Deno. Move the affected suites onto the cross-runtime helpers in `src/testing/deno-compat.ts` and onto `getLocalAdapter()` instead of the Deno adapter, so all three runners keep them. `loader-helpers.test.ts` and `transforms/mdx/index.test.ts` were portable before this branch and are restored to that state. `module-persistence.test.ts` was already excluded on `Deno.*` filesystem calls alone, so converting only the new calls would have bought nothing; every call in the file is converted instead. `server/services/rsc/orchestrators/render-handler.test.ts` stays Deno-only. Its `Deno.utime` call and its Deno-adapter import both predate this branch, and no compat shim for `utime` exists. Refs veryfront/veryfront-issue-inbox#555
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Follow-up to veryfront/veryfront-issue-inbox#555 after #3841, #3844 and #3845. Three verifiers on #3845 reported four items that are live on main. Each premise was reproduced before anything changed.
Item 2 is security relevant: a hole around the already-merged #3845 fix
buildRenderCachePrefix(projectId, environment, releaseKey)did not carry the compile mode.isLocalProjectdecides the compile mode (mode: isLocalProject ? "development" : "production"in bothrender-context.tsandenriched-context.ts) and never reached the prefix, so a local development server and a hosted preview server for the same project and branch both producedproj-1:preview:main:0.1.1243. Measured before the fix with a failing test intests/rendering/render-context.test.ts.That matters because a cached render carries its hydration bundle:
handleComponentPagetakesoptions.cachedClientModuleinstead of callingbundleComponentForClient, and that value comes fromcachedResult.pageModulethroughrenderer.tsandpage-renderer.ts. A development-compiled bundle could therefore be served to a production-mode render straight out of the render cache, bypassing the Site A hydration-cache fix that #3845 landed.The prefix now takes a required
compileModeand appends acdev/cprodsegment. Required, not optional, sodeno checkrejects a call site that omits it.parseRenderCacheKeyreads the segment back and reports it as absent for keys written before it existed. Every other consumer was checked:matchRenderCacheProjectOwnership(segments 0 to 3, unchanged),createCacheKeyFilter(membership based), and prefix-based invalidation, which goes throughctx.cachePrefixand so stays scoped to the server doing the invalidating. Both modes gain the segment rather than only development, so entries written under the old prefix shape cannot be misread after deploy; they go cold once, the same as anyVERSIONroll.Item 1: the third
dev: truesiteloader-helpers.ts:203compiled every/_vf_modules/*import of a compiled-MDX entry for development.ESMLoaderContexthas amodefield now,rendering/page-rendering.tsand the RSCrender-handler.tsboth thread it, and a context that names no mode compiles for production.Measured on a probe module, same source, same cache dir:
<ns>:19.1.1:on:compile-dev:_vf_modules/lib/label.js<ns>:19.1.1:_vf_modules/lib/label.js<ns>:19.1.1:_vf_modules/lib/label.jsCache identity holds: the two modes never share a key, and
MDX_ESM_CACHE_NAMESPACEis unchanged atmdx-esm-dee66abe, so the pre-#3845 entries stay unreachable.The Codex reviewer then found a fourth
loadModuleESMcaller the issue did not list:loadMDXLayout, reached fromapplyLayoutsESMand from the layout preload inLayoutOrchestratorwhenexperimental.esmLayoutsis on. Both already carried the mode and neither passed it, so an MDX layout's own/_vf_modules/*imports disagreed with the page wrapping them. It is threaded now and pinned by a test.Item 3: the unguarded cache-namespace invariant
buildMdxEsmCacheSchemaSampleis exported now. The new test destructuresdevCompileVariantoff the sample, rebuilds the pre-roll namespace withcreateCacheNamespace, and asserts that no key any current production builder emits can reach it. It asserts the isolation property rather than the hash, so it survives an unrelated schema change and still fails if the line goes away.Item 4: the mutation experiment
Baseline for
src/rendering/,src/transforms/,src/modules/react-loader/andsrc/cache/keys.test.ts: 297 passed, 0 failed. Each file was reverted to its pre-#3845 state on its own and the same suites re-run.src/rendering/orchestrator/module-loader/index.tssrc/rendering/orchestrator/module-loader/module-cache-lookup.tssrc/rendering/orchestrator/module-loader/module-persistence.tssrc/transforms/mdx/esm-module-loader/cache-format.tssrc/transforms/mdx/esm-module-loader/loader-helpers.tsThe experiment was run twice, independently, with matching results.
Verification
deno test src/rendering/ src/transforms/ src/modules/react-loader/ src/cache/keys.test.ts: 297 passed, 0 faileddeno fmt,deno lint,deno checkon every touched filedeno task lint:render-mode-defaults,lint:module-boundaries,lint:dependency-boundariesRefs veryfront/veryfront-issue-inbox#555
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