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test(cache): cover persistent-cache and watch invalidation across rebuilds - #22045
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An inlined export embeds its literal in every consumer's generated code, so a cache key that misses the provider hands back stale output. #22020 fixed one such path; these cases pin the rest of the family. Watch cases cover each inlinable kind, the 6-byte boundary in both directions, a re-export chain, the unconcatenated renderer, and several consumers of one literal. PersistentCaching adds the same over separate cached builds, plus EnvironmentPlugin values and a chunk shared by two runtimes, which reaches the module-graph hash's runtime-set branch. Every case was checked against the pre-fix code and fails there.
… values The inlined-export bug was one instance of a general shape: state that a consumer bakes into its generated code while the cache key covers only the consumer's own source. These cases pin the other places that shape can appear. New watch cases under a filesystem cache: JSON module values, the branch DefinePlugin selects, a provider gaining exports, an asset content hash, files entering and leaving a require.context, a package sideEffects flag, a loader's addDependency target, mangled export names moving under a cached reader, and modules regrouping between split chunks. PersistentCaching gains the same over separate cached builds for JSON, dead branches, asset hashes, loader dependencies and provided exports.
…builds Three more places a cached build can answer with state the current one would not produce. A module joining an import cycle stops being inlined, because a cycle peer may read the export in its dead zone, and must start again once the cycle breaks. A module carrying a resolve error is rebuilt on every build, so the pack must not keep serving either the broken or the repaired state. An export nothing imports is flagged unused and the provider reads that back from its own exports info, so its output turns on a consumer it never names. PersistentCaching gains the class names a CSS module exports, the define key set changing around a module that substituted it, and the documented cache.version contract for a configuration change the pack cannot see.
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Included review availability: Your plan provides up to 10 included reviews per hour; 4 remain after this review. 📝 WalkthroughWalkthroughChangesPersistent cache refresh coverage
Priority: ⬇️ Low Change: Other Merge Risk: ⚪ Minimal · up to The change adds cache-refresh test coverage and has no identified merge-blocking risk. 🚥 Pre-merge checks | ✅ 3 | ❌ 1❌ Failed checks (1 inconclusive)
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npm i -D webpack@https://pkg.pr.new/webpack@b20d92e
yarn add -D webpack@https://pkg.pr.new/webpack@b20d92e
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #22045 +/- ##
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Coverage 95.32% 95.32%
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Files 724 724
Lines 96820 96820
Branches 29566 29566
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+ Hits 92296 92297 +1
+ Misses 4524 4523 -1
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Inline comments:
In `@test/PersistentCaching.test.js`:
- Line 768: Update the environment restoration logic around previous and
process.env.WEBPACK_TEST_INLINE so it deletes WEBPACK_TEST_INLINE when previous
is undefined; otherwise restore the saved value unchanged.
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test/watchCases/cache/error-recovery/1/node_modules/some-module/index.jsis excluded by!**/node_modules/**test/watchCases/cache/error-recovery/2/node_modules/some-module/index.jsis excluded by!**/node_modules/**
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test/PersistentCaching.test.jstest/watchCases/cache/asset-contenthash-change/0/data.txttest/watchCases/cache/asset-contenthash-change/0/index.jstest/watchCases/cache/asset-contenthash-change/1/data.txttest/watchCases/cache/asset-contenthash-change/2/data.txttest/watchCases/cache/asset-contenthash-change/webpack.config.jstest/watchCases/cache/async-chunk-regroup/0/a.jstest/watchCases/cache/async-chunk-regroup/0/b.jstest/watchCases/cache/async-chunk-regroup/0/index.jstest/watchCases/cache/async-chunk-regroup/0/shared.jstest/watchCases/cache/async-chunk-regroup/1/b.jstest/watchCases/cache/async-chunk-regroup/1/shared.jstest/watchCases/cache/async-chunk-regroup/2/b.jstest/watchCases/cache/async-chunk-regroup/2/shared.jstest/watchCases/cache/async-chunk-regroup/webpack.config.jstest/watchCases/cache/context-module-files/0/index.jstest/watchCases/cache/context-module-files/0/mods/a.jstest/watchCases/cache/context-module-files/0/mods/b.jstest/watchCases/cache/context-module-files/1/mods/c.jstest/watchCases/cache/context-module-files/2/mods/b.jstest/watchCases/cache/context-module-files/webpack.config.jstest/watchCases/cache/define-dead-branch/0/feature.jstest/watchCases/cache/define-dead-branch/0/index.jstest/watchCases/cache/define-dead-branch/0/trigger.jstest/watchCases/cache/define-dead-branch/1/trigger.jstest/watchCases/cache/define-dead-branch/2/trigger.jstest/watchCases/cache/define-dead-branch/webpack.config.jstest/watchCases/cache/error-recovery/0/errors.jstest/watchCases/cache/error-recovery/0/index.jstest/watchCases/cache/error-recovery/webpack.config.jstest/watchCases/cache/inline-exports-cycle-change/0/env.jstest/watchCases/cache/inline-exports-cycle-change/0/index.jstest/watchCases/cache/inline-exports-cycle-change/1/env.jstest/watchCases/cache/inline-exports-cycle-change/1/peer.jstest/watchCases/cache/inline-exports-cycle-change/2/env.jstest/watchCases/cache/inline-exports-cycle-change/2/peer.jstest/watchCases/cache/inline-exports-cycle-change/webpack.config.jstest/watchCases/cache/inline-exports-kind-change/0/env.jstest/watchCases/cache/inline-exports-kind-change/0/index.jstest/watchCases/cache/inline-exports-kind-change/1/env.jstest/watchCases/cache/inline-exports-kind-change/2/env.jstest/watchCases/cache/inline-exports-kind-change/3/env.jstest/watchCases/cache/inline-exports-kind-change/4/env.jstest/watchCases/cache/inline-exports-kind-change/5/env.jstest/watchCases/cache/inline-exports-kind-change/webpack.config.jstest/watchCases/cache/inline-exports-many-consumers/0/a.jstest/watchCases/cache/inline-exports-many-consumers/0/b.jstest/watchCases/cache/inline-exports-many-consumers/0/c.jstest/watchCases/cache/inline-exports-many-consumers/0/env.jstest/watchCases/cache/inline-exports-many-consumers/0/index.jstest/watchCases/cache/inline-exports-many-consumers/1/env.jstest/watchCases/cache/inline-exports-many-consumers/2/env.jstest/watchCases/cache/inline-exports-many-consumers/webpack.config.jstest/watchCases/cache/inline-exports-no-concatenation/0/env.jstest/watchCases/cache/inline-exports-no-concatenation/0/index.jstest/watchCases/cache/inline-exports-no-concatenation/1/env.jstest/watchCases/cache/inline-exports-no-concatenation/2/env.jstest/watchCases/cache/inline-exports-no-concatenation/webpack.config.jstest/watchCases/cache/inline-exports-reexport-chain/0/barrel.jstest/watchCases/cache/inline-exports-reexport-chain/0/index.jstest/watchCases/cache/inline-exports-reexport-chain/0/leaf.jstest/watchCases/cache/inline-exports-reexport-chain/0/mid.jstest/watchCases/cache/inline-exports-reexport-chain/0/renamed.jstest/watchCases/cache/inline-exports-reexport-chain/1/leaf.jstest/watchCases/cache/inline-exports-reexport-chain/2/leaf.jstest/watchCases/cache/inline-exports-reexport-chain/webpack.config.jstest/watchCases/cache/inline-exports-size-boundary/0/env.jstest/watchCases/cache/inline-exports-size-boundary/0/index.jstest/watchCases/cache/inline-exports-size-boundary/1/env.jstest/watchCases/cache/inline-exports-size-boundary/2/env.jstest/watchCases/cache/inline-exports-size-boundary/webpack.config.jstest/watchCases/cache/json-value-change/0/data.jsontest/watchCases/cache/json-value-change/0/index.jstest/watchCases/cache/json-value-change/1/data.jsontest/watchCases/cache/json-value-change/2/data.jsontest/watchCases/cache/json-value-change/webpack.config.jstest/watchCases/cache/loader-file-dependency/0/index.jstest/watchCases/cache/loader-file-dependency/0/loader.jstest/watchCases/cache/loader-file-dependency/0/tracked.txttest/watchCases/cache/loader-file-dependency/1/tracked.txttest/watchCases/cache/loader-file-dependency/2/tracked.txttest/watchCases/cache/loader-file-dependency/webpack.config.jstest/watchCases/cache/mangled-export-names/0/index.jstest/watchCases/cache/mangled-export-names/0/lib.jstest/watchCases/cache/mangled-export-names/0/other.jstest/watchCases/cache/mangled-export-names/0/stable.jstest/watchCases/cache/mangled-export-names/1/other.jstest/watchCases/cache/mangled-export-names/2/ot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…efore Assigning an undefined value to process.env stores the string "undefined" and leaves the key present, so the variable leaked out of the test into whatever ran next in the same process.
Merging this PR will degrade performance by 4.95%
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| Mode | Benchmark | BASE |
HEAD |
Efficiency | |
|---|---|---|---|---|---|
| ❌ | Memory | benchmark "asset-modules-source", scenario '{"name":"mode-production","mode":"production"}' |
6.3 MB | 8.4 MB | -25.2% |
| ⚡ | Memory | benchmark "resolve-unsafe-cache", scenario '{"name":"mode-development-rebuild","mode":"development","watch":true}' |
552.2 KB | 457.2 KB | +20.79% |
Tip
Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.
Comparing test/cache-inline-exports-regressions (49e803d) with main (b5817d1)
Footnotes
-
6 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩
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Types CoverageCoverage after merging test/cache-inline-exports-regressions into main will be
Coverage Report |
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Summary
#22020 fixed one instance of a general shape: state a consumer bakes into its generated code while the cache key covers only the consumer's own source. This adds 17
watchCases/cache/cases and 15PersistentCachingtests pinning that shape across the places it can appear. Refs #22019.The six inlined-export cases were each verified against the pre-#22020 code and fail there; the rest guard adjacent paths (JSON values, the branch DefinePlugin selects, provided/used exports, asset content hashes,
require.contextcontents, asideEffectsflag, a loader'saddDependencytarget, mangled export names, split-chunk regrouping, resolve errors, CSS class names, the define key set, andcache.version).What kind of change does this PR introduce?
test
Did you add tests for your changes?
Yes — this PR is only tests:
test/watchCases/cache/*(17 new cases) andtest/PersistentCaching.test.js(15 new tests). Nolib/changes.Does this PR introduce a breaking change?
No
If relevant, what needs to be documented once your changes are merged or what have you already documented?
n/a
Use of AI
Yes. AI was used to write the cases and to verify them: the inlined-export ones were checked by reverting #22020's
lib/changes and confirming each goes red, andfindModulesInCycles,emitOnErrorsandcache.versionbehaviour were read out of the source rather than assumed. Every case was run locally, as were all lint stages.Generated by Claude Code
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