perf(db): rename private members in the published build (−2.9 KB gzip) - #1962
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Consumer minifiers never rename properties, so long TypeScript-private member names reached every production bundle. The db build now renames 368 of them with esbuild mangleProps, from a committed name map. - packages/db/mangle-cache.json maps each name to a stable short name. The build fails if esbuild renames a name outside it. - scripts/mangle-private-members.mjs (pnpm check:mangle) keeps only names whose every use in db src resolves to a private member, that never appear as strings, and that no other package reads. --write updates the map. - test:minified-db now bundles the built dist and rejects stale dist. CI runs check:mangle and builds db before that lane. Co-authored-by: Isaac <no-reply@databricks.com>
Record the safety rule, guard calibration, minified-lane controls, consumer bundle bytes, and the 2,580 consumer tests on the renamed dist for 6dbf398. Update the minified lane coverage row and the changeset size. Co-authored-by: Isaac <no-reply@databricks.com>
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: defaults Review profile: CHILL Plan: Advanced Run ID: 📒 Files selected for processing (1)
🚧 Files skipped from review as they are similar to previous changes (1)
Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe DB build now applies cached names to TypeScript-private members. A script checks and updates the name cache. CI validates the cache, builds both DB packages, and bundles the built DB package for the minified API check. ChangesDB private-member mangling
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Refactor Sequence Diagram(s)sequenceDiagram
participant CI
participant ViteBuild
participant manglePrivateMembers
participant MangleCache
participant esbuild
participant MinifiedDBCheck
CI->>ViteBuild: Build DB packages
ViteBuild->>manglePrivateMembers: Transform build chunk
manglePrivateMembers->>MangleCache: Read name mappings
manglePrivateMembers->>esbuild: Transform chunk using cached names
esbuild-->>manglePrivateMembers: Return transformed code and source map
manglePrivateMembers-->>ViteBuild: Return transformed chunk
CI->>MinifiedDBCheck: Check cache and run minified API check
MinifiedDBCheck->>MinifiedDBCheck: Verify and bundle built DB entry
Merge Risk: ⚪ Minimal · up to The documentation accurately describes the build validation workflow. No actionable merge-blocking issue remains in the selected changes, subject to normal checks. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 4 systems. Changed systems: Architecture concerns Review detailsSystems and components
Before / after behavior
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Size Change: -2.54 kB (-1.45%) Total Size: 172 kB 📦 View Changed
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Inline comments:
Review comments at @scripts/mangle-private-members.mjs:
- Around line 97-103: Update the visitor in the cached-name validator to check
constructor parameter properties with checkName, including public, protected,
private, and readonly parameter properties; ordinary parameters should remain
excluded. Add the calibration fixture for public authoritativeRequestState so
the validator catches this case.
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.changeset/rename-private-members.md.github/workflows/pr.ymldocs/contributing/oracle-coverage.mddocs/contributing/oracle-reviews/code-weight-private-member-mangling.mdpackage.jsonpackages/db/mangle-cache.jsonpackages/db/vite.config.tsscripts/mangle-private-members.mjsscripts/test-minified-db.mjs
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A public, readonly, or protected constructor parameter property also declares a property, but the guard never visited parameters. Such a property with a cached name passed the check. The guard now checks parameter properties like other property declarations. The cache does not change. Co-authored-by: Isaac <no-reply@databricks.com>
test:minified-db compared dist only with src and the mangle cache. A change to packages/db/vite.config.ts, package.json, or tsconfig.json after the last build let the lane pass against output from the older build pipeline. The check now includes those files. Co-authored-by: Isaac <no-reply@databricks.com>
…ivate # Conflicts: # docs/contributing/oracle-coverage.md
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Consumer minifiers rename local variables, but they never rename properties. So every long TypeScript-private member name in
@tanstack/db, such asauthoritativeRequestStateortruncateReplayState, reaches every production bundle in full. This PR renames 368 of those members to short names in the published build. The public API, the type declarations, and the source maps do not change.es2020)The minified saving is large because each long name repeats many times. Gzip and brotli already encode most repeats as short back-references, so the compressed saving is smaller.
How the rename works
A
renderChunkstep inpackages/db/vite.config.tsruns esbuildmanglePropson each emitted ESM and CJS module. It uses a committed name map,packages/db/mangle-cache.json:{ "authoritativeRequestState": "l", "truncateReplayState": "o" }The map makes the rename reversible, and it keeps short names stable across releases. The build fails if esbuild renames a name that is not in the map.
For debugging, each
distfile still has a source map that points at the original TypeScript, and the package also publishessrc. Devtools and source-mapped stack traces show the original names. The map decodes the rest, such as object keys in the console.Why the rename is safe
esbuild renames every property with a mapped name, anywhere in the output, without regard to types. So if
sizewere in the map,map.sizeon a nativeMapwould change too. The safety rule therefore covers every use of each name.scripts/mangle-private-members.mjs(pnpm check:mangle) accepts a name only when all of these hold:packages/db/srcresolves, through the TypeScript checker, to aprivateclass member inpackages/db/src. Ananyreceiver, a lib type, db-ivm, an interface, or an object literal key makes the name unsafe.packages/db/src. esbuild does not rename quoted keys.srcor tests read.nameor'name'. Those packages consume the renameddist.Each short name must also be unique and must not be an identifier in db or db-ivm
src. Of 470 private names, 368 pass. CI runs the check before the build, so a later public property with a mapped name fails CI instead of being renamed silently.--writeupdates the map and keeps existing short names.To calibrate the guard, I planted six hostile uses of a mapped name. Each one fails the check at its file and line:
react-dbEvidence that behavior does not change
db's own suite runs against
src, so it cannot see the rename. Every package that depends on@tanstack/dbresolves it to the builtdist, so their suites run against the renamed output. All 12 consumer packages pass, with 2,580 tests in total.test:minified-dbbundledsrcbefore this PR. It now bundles the builtdist, which is what consumers install. It rejects adistthat is older thansrc, the map, or the build configuration. The configuration files arevite.config.ts,package.json, andtsconfig.json. CI builds db-ivm and db before this lane. This move exposed a silent control: thenew.target.namemutant matchedsrc/errors.ts, which the bundle no longer loads, so the control passed. The mutant now matchesdist/esm/errors.js, and all three hostile controls fail at their intended assertions.Costs and limits
distJavaScript is harder to read directly (this.ay). Stack traces that are not source-mapped show short names for renamed private methods.@__PURE__annotations and legal comments. It drops other JavaScript comments. The.d.tsdocumentation does not change.Object.keys(collection), shows short names. No checked package does this. Code outside this repository that reads db internals throughanyis unsupported and can break.@tanstack/db-ivmis not renamed. It already uses native#privatemembers, and a probe showed a gain under 0.5% gzip.#private. It saves more ates2022, but it adds 2.4% gzip when a consumer's bundler targetses2020, so I rejected it.The review record has the full rule, calibration, and results:
docs/contributing/oracle-reviews/code-weight-private-member-mangling.md.Reviewer checks
scripts/mangle-private-members.mjscover every way a mapped name can reach a property in the output?dist, given source maps and the committed map?Minified DB public APICI job to build db beforetest:minified-db?Verification
On
6dbf3982:pnpm check:mangle: 368 names.pnpm test:minified-dbagainst the builtdist: error names, index metadata, query rows, and live updates pass.dist: 2,580 tests.packages/dbVitest, typecheck off: 193 files, 7,164 tests.pnpm test:oracles: 49 files with 2,847 tests, and 16 files with 454 tests and 1 todo.This pull request and its description were written by Isaac.
Summary by CodeRabbit
Performance
@tanstack/dbbundle size through build-time optimization. Public APIs and TypeScript declarations remain unchanged, and source maps continue to point to the original source.Reliability