perf(manifest): collect Webpack stats from the compilation graph by ScriptedAlchemy · Pull Request #5080 · module-federation/core

ScriptedAlchemy · 2026-09-15T01:02:34Z

Description

Collect Webpack federation manifest data directly from the compilation graph instead of serializing Webpack stats and parsing module identifiers.

This is the base PR for layer support, which is stacked on this branch. This PR adds no layer API, layer metadata, runtime protocol, preview dependency, or lockfile change.

What changes

Read exposes, shared modules, remotes, and assets from module/chunk/code-generation data, reusing the existing normalized managers.
Use this path by default when the required Webpack metadata is available. Keep the previous reader when it is unavailable.
Add an explicit rollback option:
```
new ModuleFederationPlugin({
  name: 'host',
  manifest: { useLegacyStats: true },
});
```
Omitting the option, or setting it to false, uses graph collection where supported. Native Rspack stats and their JavaScript post-processing are unchanged. The option is also documented in the English and Chinese manifest configuration guides.
Keep the rollback reader’s pre-PR handling of unnamed chunk groups. A real Webpack fixture with import("./other.js"), other.js importing an exposed component, and split chunks confirms that rollback excludes the unrelated other_js.js from expose assets. The graph collector explicitly retains its wider group collection.
Correct direct expose-to-shared relationships: an expose importing a shared module now records that share in requires, and the share records the expose in usedIn. These existing fields were empty in the old reader for the tested enhanced-sharing case. This is an intentional output correction, not a claim of byte-for-byte equivalence.

Review order

packages/manifest/src/collectGraph.ts: structured collection, actual compiler-selected remote aliases, and asset association.
StatsManager.ts: select the collector or old reader, then use common finalization. Removes synchronous Promise wrappers; preserves asset emission and additionalData order.
Graph.spec.ts: real Webpack builds compare both emitted JSON artifacts with default, explicit graph, and rollback modes; includes filesystem-cache restoration, shared prefixes, and overlapping/unused remotes.
SDK manifest option and enhanced schema. The validator changes are generated by pnpm run generate:schema.

Related Issue

Related performance reports: #3713 and #4286. This does not claim to reproduce or fix those applications' complete build times. The layers follow-up is #5039.

Validation

Enhanced dependency build: 15 tasks passed.
Manifest: 12 tests; SDK: 69; managers: 23; enhanced sharing/schema: 316; focused config cases: 5 passed. One existing SDK test is skipped; unrelated config cases were filtered.
Schema generation, manifest lint, root formatting, changeset validation, and normal commit hooks passed.
Full application/Metro E2Es and native Rspack execution were not rerun for this Webpack-only collector slice. CI results are separate from these local checks.

Latest follow-up: the foundation manifest suite passes 13/13, including the regression above against both emitted JSON files; manifest build, package lint, changed-file formatting and normal commit hooks pass. The exact pre-PR asset helper at ee32a0d1 returns only exposed.js for this fixture. Full local root formatting is blocked by an unrelated missing Next-app @tailwindcss/typography dependency; the exact-head hosted package, Node 20, and broad E2E jobs pass. No full application/native compiler rerun is claimed for this foundation check.

Benchmark

Successful isolated CI run and raw artifacts: 100 exposes, 20 common imports per expose, one shared singleton, and synchronous/asynchronous JS/CSS. Webpack 5.104.1, Node 24.18.0, GitHub-hosted Ubuntu 24.04. Both modes use commit 07527d3 and the same built packages, changing only manifest.useLegacyStats.

Five alternating independent process pairs, one discarded warmup pair, and three real single-source HMR edits per process. Values are median [min–max] in milliseconds unless noted. Rebuild statistics summarize each process's median first.

Measurement	Previous reader	Graph collector
Cold build	1,016.14 [999.51–1,017.13]	906.12 [893.81–958.14]
Cold stats generation	90.20 [86.03–101.79]	7.59 [7.57–9.72]
Incremental build	226.90 [207.24–230.49]	155.00 [151.27–160.66]
Incremental stats generation	70.67 [69.24–73.46]	5.54 [4.72–6.74]
Edit to completion, including watcher latency	248.42 [229.68–253.11]	176.68 [173.04–182.32]
Whole-process peak RSS, MiB	342.72 [342.09–381.51]	313.02 [309.73–321.91]

Manifests and asset lists matched. Stats differed only by the documented requires/usedIn correction; no unexpected differences or warnings. Every measured edit rebuilt exactly one source module and emitted HMR updates. Each compilation called Stats.toJson once with the previous reader and zero times with graph collection.

Stats generation measures generateStats, not just the inner graph function. Build time excludes process startup and watcher debounce; RSS includes setup and rebuilds. OS caches were not cleared. Process sampling found no competing compiler/test, but cannot exclude underlying hosted-machine contention. These are synthetic-fixture results, not a universal speedup or the original report's full application.

Additional local evidence, measured separately on Node 22.23.2: a 2,000-module fixture with one remote and no exposes/shares improved median cold build from 1,581 to 1,448 ms and rebuilds from 289 to 201 ms, with exact JSON equality. Earlier local expose runs overlapped unrelated builds and remain excluded.

Types of changes

Docs change / refactoring / dependency upgrade
Bug fix (non-breaking change which fixes an issue)
New feature (non-breaking change which adds functionality)

Checklist

I have added tests to cover my changes.
All new and existing tests passed.
I have updated the documentation.

Focused checks passed as listed above; the complete workspace suite was not run.

changeset-bot · 2026-09-15T01:02:40Z

🦋 Changeset detected

Latest commit: b99a1c3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 48 packages

Name	Type
@module-federation/manifest	Patch
@module-federation/sdk	Patch
@module-federation/enhanced	Patch
@module-federation/modern-js-v3	Patch
@module-federation/modern-js	Patch
@module-federation/rspack	Patch
@module-federation/devtools	Patch
@module-federation/cli	Patch
@module-federation/dts-plugin	Patch
@module-federation/esbuild	Patch
@module-federation/managers	Patch
@module-federation/metro	Patch
@module-federation/nextjs-mf	Patch
@module-federation/node	Patch
@module-federation/observability-plugin	Patch
@module-federation/retry-plugin	Patch
@module-federation/rsbuild-plugin	Patch
@module-federation/rspress-plugin	Patch
@module-federation/rstest	Patch
@module-federation/runtime-core	Patch
@module-federation/runtime	Patch
@module-federation/storybook-addon	Patch
@module-federation/utilities	Patch
@module-federation/webpack-bundler-runtime	Patch
@module-federation/bridge-react-webpack-plugin	Patch
@module-federation/bridge-react	Patch
@module-federation/bridge-vue3	Patch
shared-tree-shaking-no-server-host	Patch
shared-tree-shaking-no-server-provider	Patch
@module-federation/metro-plugin-rnc-cli	Patch
@module-federation/metro-plugin-rnef	Patch
@module-federation/metro-plugin-rock	Patch
shared-tree-shaking-with-server-host	Patch
shared-tree-shaking-with-server-provider	Patch
node-dynamic-remote-new-version	Patch
node-dynamic-remote	Patch
@module-federation/playground	Patch
remote5	Patch
remote6	Patch
website-new	Patch
@module-federation/runtime-tools	Patch
@module-federation/inject-external-runtime-core-plugin	Patch
create-module-federation	Patch
@module-federation/error-codes	Patch
@module-federation/third-party-dts-extractor	Patch
@module-federation/treeshake-frontend	Patch
@module-federation/treeshake-server	Patch
@module-federation/bridge-shared	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

chatgpt-codex-connector · 2026-09-15T01:02:43Z

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-15T01:07:11.225171Z	`07527d3`	PR opened

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pkg-pr-new · 2026-09-15T01:05:47Z

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commit: d2903b2

github-actions · 2026-09-15T01:06:39Z

Bundle Size Report

11 package(s) changed, 32 unchanged.

Package dist + ESM entry

Package	Total dist (raw)	Delta	ESM gzip	Delta
`@module-federation/enhanced`	820.5 kB	+1.0 kB (+0.1%)	672 B	no change
`@module-federation/inject-external-runtime-core-plugin`	5.2 kB	+26 B (+0.5%)	518 B	no change
`@module-federation/manifest`	145.6 kB	+13.7 kB (+10.3%)	106 B	no change
`@module-federation/playground`	16.08 MB	-704 B (-0.0%)	45.8 kB	no change
`@module-federation/runtime`	20.4 kB	+13 B (+0.1%)	724 B	no change
`@module-federation/sdk`	129.1 kB	+144 B (+0.1%)	785 B	no change

Bundle targets

Package	Web bundle (gzip)	Delta	Node bundle (gzip)	Delta
`@module-federation/cli`	2.3 kB	-4 B (-0.2%)	2.4 kB	-32 B (-1.3%)
`@module-federation/core`	1.0 kB	-1 B (-0.1%)	1.0 kB	-33 B (-3.0%)
`@module-federation/devtools`	30.3 kB	-8 B (-0.0%)	30.3 kB	-32 B (-0.1%)
`@module-federation/enhanced`	2.7 kB	+10 B (+0.4%)	2.8 kB	-43 B (-1.5%)
`@module-federation/manifest`	6.5 kB	+954 B (+16.8%)	6.5 kB	+954 B (+16.8%)
`@module-federation/metro-plugin-rnc-cli`	416 B	+1 B (+0.2%)	435 B	-26 B (-5.6%)
`@module-federation/node`	9.1 kB	no change	9.1 kB	-28 B (-0.3%)

Consumer scenarios

Scenario	Web output (gzip)	Delta	Node output (gzip)	Delta	Gap (node-web)	Delta
Enhanced remoteEntry	22.2 kB	no change	23.7 kB	+2 B (+0.0%)	+1.6 kB	+2 B

Total dist (raw): 23.42 MB (+14.1 kB (+0.1%))
Total ESM gzip: 111.7 kB (no change)
Total web bundle (gzip): 254.2 kB (+952 B (+0.4%))
Total node bundle (gzip): 256.5 kB (+760 B (+0.3%))
Tracked ./bundler entry gzip: 563 B (no change)
Tracked ./bundler web bundle (gzip): 4.9 kB (no change)
Tracked ./bundler node bundle (gzip): 4.9 kB (no change)

Bundle sizes are generated with rslib (Rspack). Package-root metrics preserve the historical report. Tracked subpath exports such as ./bundler are measured separately so ENV_TARGET-driven tree-shaking is visible. Bare imports are externalized to keep package-level sizes consistent, and assets are emitted as resources.

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chatgpt-codex-connector · 2026-09-15T01:07:09Z

+    const version =
+      'version' in data
+        ? JSON.parse(data.version)
+        : (normalized?.version ?? sharedMap[key]?.version);
+    if (!name || !version) continue;


Preserve consume-only shares with exact versions

When a shared dependency is configured with import: false, is absent from the local installation, and has an exact requiredVersion, normalized.version is undefined and consume code-generation data contains no version, so this branch skips the dependency entirely. The legacy reader recovered the exact version from the consume identifier; because graph collection is now the default, the generated stats and manifest unexpectedly lose this valid shared entry unless useLegacyStats is enabled.

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ScriptedAlchemy · 2026-09-16T02:05:20Z

One thing from a read of this diff, not reproduced. getAssetsByChunk in packages/manifest/src/utils.ts changed its !chunkGroup.name || condition, and the same helper is still called from _getModuleAssets in StatsManager.ts. Under manifest: { useLegacyStats: true } that means unnamed chunk groups (an import() without webpackChunkName that also reaches an expose chunk) now contribute to the expose's sync assets, which the previous reader skipped, so the rollback option no longer reproduces pre-PR mf-stats.json. Graph.spec.ts cannot catch it because it compares the graph collector against the new legacy path in the same build. If the graph path needs the wider condition, passing it as a flag from collectGraph only would keep the legacy reader byte-identical. Also, useLegacyStats is in the README but not in apps/website-new/docs/{en,zh}/configure/manifest.mdx, where users look for manifest options.

github-actions · 2026-09-30T21:12:51Z

Deploying with ☁️ Zephyr Cloud

The latest preview deployments for this pull request.

Status	Name	Latest Commit	Version URL	Updated (UTC)
✅ Deployment successful! View deployment	website-new	`d2903b2`	Version ↗	30 Sept 2026, 21:12

Affected deployment targets

Application	Type	Target
website-new	Environment	latest ↗
website-new	Tag	latest ↗
website-new	Tag	web_codex-manifest-graph-foundation_nestor_lopez ↗

perf(manifest): collect webpack stats from compilation graph

07527d3

github-actions Bot added the change: perf label Sep 15, 2026

chatgpt-codex-connector Bot reviewed Sep 15, 2026

View reviewed changes

test(manifest): isolate graph compiler spies and timeout

0a981ee

This was referenced Sep 25, 2026

feat(enhanced): compose the runtime bootstrap behind experiments.composedRuntime #5140

Open

feat!: compose the federation runtime by default and remove the capability defines #5142

Open

ScriptedAlchemy and others added 2 commits September 29, 2026 16:20

chore: merge main into manifest graph foundation

b99a1c3

fix(manifest): preserve legacy unnamed-chunk assets

d2903b2

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perf(manifest): collect Webpack stats from the compilation graph - #5080

perf(manifest): collect Webpack stats from the compilation graph#5080
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