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feat(build): perf: skip Cedar source transforms for Prisma client output - #2965
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Files under a prisma-client or prisma-client-js generator's output directory only get their import specifiers rewritten to .js in the API builds. The other Cedar transforms are no-ops on generated client code, and on large schemas the model files are tens of megabytes. The output directories are resolved from schema.prisma in a worker thread so that loading @prisma/internals doesn't slow down the build process.
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📝 Summary
Priority: ➖ Normal Merge Risk: ⚪ Minimal · up to No actionable merge-blocking risk is established; the generated-client exclusion checks complete before the inspected transforms run. Pre-merge checks |
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| Check name | Status | Explanation |
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| Docstring Coverage |  |
Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 11 files. |
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| Title check | |
The title clearly identifies the build performance change and the skipped Cedar transforms for Prisma client output. |
| Description check | |
The description directly explains the Prisma client transform optimization, affected build pipelines, implementation, performance results, and tests. |
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Review comments at @packages/vite/src/buildApp.ts:
- Line 381: Update buildCedarApp and buildApiWithVite to create one Prisma
client matcher per build and pass that same matcher to cedarImportDirPlugin,
cedarOtelWrappingPlugin, and the inline API Babel plugin; reuse one matcher
across the API dev server plugins as well.
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📒 Files selected for processing (10)
packages/internal/src/build/api.tspackages/project-config/build.tspackages/project-config/src/__tests__/prismaClientOutputDirs.test.tspackages/project-config/src/prisma.tspackages/project-config/src/prismaClientOutputDirsWorker.tspackages/vite/src/apiDevMiddleware.tspackages/vite/src/buildApp.tspackages/vite/src/plugins/__tests__/vite-plugin-cedar-otel-wrapping.test.tspackages/vite/src/plugins/vite-plugin-cedar-import-dir.tspackages/vite/src/plugins/vite-plugin-cedar-otel-wrapping.ts
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| const cedarPaths = getPaths() | ||
| const cedarConfig = getConfig() | ||
| const normalizedBase = normalizePath(cedarPaths.base) | ||
| const prismaClientFiles = createPrismaClientFileMatcher() |
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During cedar dev --ud, changing the generator output, running cedar prisma generate, and updating the client import leaves this matcher pointing at the old directory. New client files then run through the expensive transforms again until the dev process restarts. Refresh both this matcher and the import-dir plugin's matcher when the schema changes.
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Not changing this. Moving a generated client while cedar dev keeps running is rare: it also means editing schema.prisma, regenerating, and updating every client import. Even then, only speed is affected: the moved files go through the normal transforms and still build correctly, and restarting the dev server picks up the new location. The esbuild watcher (rebuildApi) does refresh on every rebuild, through onStart. Watching the schema to refresh the Vite matchers would add more machinery than this edge case warrants.
| const resolveOutputDirs = vi.fn(async () => [outputDir]) | ||
| const prismaClientFiles = createPrismaClientFileMatcher(resolveOutputDirs) |
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These tests never exercise getPrismaClientOutputDirsIsolated, which every build pipeline uses by default. They call the parser directly or supply a fake lookup. A missing worker file or a worker that cannot find the project could silently return [] while all tests pass. Add a test against the built package that starts the real worker and checks the returned directory.
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Not adding a dist-level test here. A failed or missing worker falls back to [] on purpose. That only means no speedup: every file then goes through the full transforms, as it does without this PR, so builds stay correct. The real worker is verified end to end in the PR description, with byte-identical output on all three builds. The project-config tests run against src, where the built worker file doesn't exist. Testing the worker for real would need a build step before the tests, which is too much for a fallback that's safe by design.
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That’s fair. Given the intentional [] fallback, a missing or unusable worker only disables the optimization and preserves the existing transform path, so it cannot affect build correctness. The documented end-to-end builds provide coverage of the real worker in the built package, while adding a dist-level test would require an otherwise unrelated build step. I’m withdrawing this concern.
jscodeshift's Babel register hook transpiles @cedarjs/project-config to CommonJS at runtime but leaves import.meta in place, which makes Node load the result as an ES module and fail on `exports`. The worker URL now lives in a separate module that is loaded on demand.
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When a Prisma client generator writes its output into
api/src(e.g.output = "../src/generated/prisma"), every generated file goes through Cedar's API source transforms. Those transforms are no-ops on generated client code, but the model files of a large schema can be tens of megabytes, and the transforms are slow on them. #2951 (by @mcorrigan89) found a production app spending 74 seconds of an 88 second API build inapplyDirectoryNamedImporton a single 62 MBmodels/User.ts.Files inside the output directory of a
prisma-clientorprisma-client-jsgenerator now only getapplyImportExtensions, which rewrites their import specifiers to the compiled.jsoutput and is still required (e.g. withimportFileExtension = "ts"). This applies to every API pipeline:buildApi/rebuildApi, the defaultcedar buildand the dev watcher)buildApiWithVite(streaming SSR)buildCedarApp(--ud) and the Vite API dev server, including the OTel wrapping and import-dir pluginsOther generators are not included, because third-party generators (e.g. Zod schema generators) can emit ordinary source that relies on Cedar's transforms.
How the output directories are resolved
createPrismaClientFileMatcher()in@cedarjs/project-configreads the generatoroutputpaths fromschema.prismaonce per build, from the plugin'sbuildStarthook (or esbuild'sonStart), so the lookup never competes with module transforms.The lookup runs in a
worker_thread. Loading@prisma/internalsin the build process has process-wide side effects (it loadsgraceful-fs, among other things) that made the--udbuild about 4 seconds slower on its own. A worker has its own module registry, so those effects stay contained. The lookup takes about 0.4 seconds.Results
A copy of
local-testing-projectwith a 60-model schema whose client (59 MB) is generated intoapi/src/generated/prisma. Averages of three runs:mainbuildApi()buildApiWithVitebuildCedarApp(--ud)The
--udbuild is dominated by Vite/Rollup's own parsing of the generated files, not Cedar's transforms, so it is unchanged.The build output (all
.jsand.js.mapfiles) is byte-identical tomainfor all three builds. The Vite API dev server starts and loads the generated models and the real client throughlib/db.ts.Projects using the default
output = "./generated/prisma"(outsideapi/src) are unaffected: those files are not part of the API build.Note: The regex in
applyDirectoryNamedImportthat #2951 targeted is still quadratic on large files with many quote-freeexportlines from other sources. That is a separate fix.