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test(bundle-size): lower the create() budgets and keep the JavaScript parser and the MCP client out - #943
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title clearly identifies the main changes: lower bundle-size budgets and keep the JavaScript parser and MCP client out of browser bundles. |
| Description check | |
The description includes the required What and why and Tests sections. It explains the budget changes, exclusion checks, results, regression coverage, and formatting checks. The User-facing change sec… |
| Linked Issues check | |
Issue #885 requires acorn and astring to remain out of the create() bundle and requires a lower matching budget. The PR lowers the budgets and adds NEVER_BUNDLED checks for acorn, `acorn-wal… |
| Out of Scope Changes check | |
The changes remain in browser-bundle-size.e2e.spec.ts. The MCP client checks extend browser bundle dependency validation, and the js-yaml and vectoriadb pattern correction fixes the existing fea… |
| Docstring Coverage | |
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1… |
Full details: Description check
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Explanation
The description includes the required What and why and Tests sections. It explains the budget changes, exclusion checks, results, regression coverage, and formatting checks. The User-facing change section is not needed for this test-only change.
Full details: Linked Issues check
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Explanation
Issue
#885requiresacornandastringto remain out of thecreate()bundle and requires a lower matching budget. The PR lowers the budgets and addsNEVER_BUNDLEDchecks foracorn,acorn-walk, andastringin both browser bundles. The supplied change summary states that the whole PR changes only the bundle-size E2E test, so safe-regex behavior and its tests remain unchanged.
Full details: Out of Scope Changes check
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Explanation
The changes remain in
browser-bundle-size.e2e.spec.ts. The MCP client checks extend browser bundle dependency validation, and thejs-yamlandvectoriadbpattern correction fixes the existing feature-leak check. These changes support bundle-size and dependency-exclusion validation and show no unrelated product behavior.
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No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1 files.
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Review comments at
@apps/e2e/demo-e2e-bundle-size/e2e/browser-bundle-size.e2e.spec.ts:
- Line 36: Update the “MCP client” assertion pattern to match both
libs/protocol/dist/esm/client.mjs and libs/protocol/dist/esm/clients.mjs, while
preserving the existing node_modules SDK client path and internal #client entry
coverage.
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… parser and the MCP client out #921 took @enclave-vm/ast's parser (acorn, acorn-walk, astring) out of every browser bundle, and #886 the MCP client, but the suite's budgets still allowed 1.56 MB and 1.57 MB for create() + one tool (+ WebMcpPlugin) and 1.18 MB for a Vite app's initial chunk. The budgets now sit about 1% above the current sizes (1,300,483, 1,307,783 and 948,317 bytes), and a new test fails when the parser or the MCP client's modules contribute any bytes to either bundle, naming the import chain. The skills pattern's node_modules alternative is anchored like the inputs it matches, which are relative to the workspace root.
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Performance Test ResultsStatus: ✅ All tests passed Summary
Total: 101 tests across 21 projects 📊 View full report in workflow run Generated at: 2026-10-21T17:22:44.697Z |
…P client @frontmcp/protocol/client resolves to libs/protocol/dist/esm/clients.mjs, so the never-bundled pattern matches it as well as #client's client.mjs.
Cherry-pick CreatedA cherry-pick PR to Please review and merge if this change should also be in If the cherry-pick is not needed, close the PR. |
…lient, and tighter bundle-size budgets (#942, #943) (#947) * perf(protocol): serve the MCP client and its transports from @frontmcp/protocol/client (#942) The package root re-exported #client, so every importer of @frontmcp/protocol pulled in the MCP SDK's client modules: a browser or Worker bundle of a server kept shared/auth.js's OAuth schemas and the client modules' side effects even though an in-process server never builds a client. The client, its Streamable HTTP and SSE transports and the stdio client now come from the @frontmcp/protocol/client subpath, which re-exports #client and so keeps its lazy require() variant. The direct client, the remote-MCP client service, @frontmcp/testing's raw client and the tests import them from there. (cherry picked from commit fd012ad) * test(bundle-size): lower the create() budgets and keep the JavaScript parser and the MCP client out (#943) * test(bundle-size): lower the create() budgets and keep the JavaScript parser and the MCP client out #921 took @enclave-vm/ast's parser (acorn, acorn-walk, astring) out of every browser bundle, and #886 the MCP client, but the suite's budgets still allowed 1.56 MB and 1.57 MB for create() + one tool (+ WebMcpPlugin) and 1.18 MB for a Vite app's initial chunk. The budgets now sit about 1% above the current sizes (1,300,483, 1,307,783 and 948,317 bytes), and a new test fails when the parser or the MCP client's modules contribute any bytes to either bundle, naming the import chain. The skills pattern's node_modules alternative is anchored like the inputs it matches, which are relative to the workspace root. * test(bundle-size): treat the client subpath's entry as part of the MCP client @frontmcp/protocol/client resolves to libs/protocol/dist/esm/clients.mjs, so the never-bundled pattern matches it as well as #client's client.mjs. (cherry picked from commit 71df5d8)
Stack 2 of 2, based on #942 (
perf/1.10.x-protocol-client-subpath). Merge in order.Closes #885.
What and why
#885 asked for
@enclave-vm/ast's JavaScript parser to stay out of browser bundles. #921 did that:@frontmcp/utilsimports@enclave-vm/ast/redos, which loads none of the parser, and the bundle ofcreate()+ one tool has no acorn, acorn-walk or astring file, only@enclave-vm/ast/esm/redos.mjs(7 KB). What was left was the issue's acceptance criteria, which this PR covers inapps/e2e/demo-e2e-bundle-size/e2e/browser-bundle-size.e2e.spec.ts:create()+ one tool, 1,570,000 withWebMcpPlugin, and 1,180,000 for a Vite app's initial chunk. They now sit about 1% above the sizes after perf(protocol): serve the MCP client and its transports from @frontmcp/protocol/client #942: 1,315,000, 1,322,000 and 960,000 bytes.@frontmcp/protocol's client modules (client.mjsfor#client,clients.mjsfor the@frontmcp/protocol/clientsubpath, 1.10: @frontmcp/protocol serves its MCP clients from subpaths #886, perf(protocol): serve the MCP client and its transports from @frontmcp/protocol/client #942), contributes a byte. It reads the same metafile sizes as the feature-leak test and, on a failure, names the import chain that brought the module in.skillspattern for js-yaml and vectoriadb required a/beforenode_modules, but the metafile's inputs are relative to the workspace root (node_modules/js-yaml/...), so that half of the pattern couldn't match. It is anchored like the new patterns. Neither package is in the bundle.Results
Apple M4 Pro (14 cores, 48 GiB), macOS 15.6.1, Node.js 24.18.1. The sizes are the suite's own output, from the packages built from this branch. Bytes are exact, so no load average applies.
create()+ one tool, esbuild, minifiedcreate()+WebMcpPlugin+ one tool, esbuild, minifiedcreate()+ one tool, Vite, initial chunkTests
nx run demo-e2e-bundle-size:test: 10 tests pass (8 before, plus the new test for each of the two bundles), andtypecheck-e2epasses.@frontmcp/protocol's root re-export of the client put back intolibs/protocol/dist/esm/index.mjs, the state before perf(protocol): serve the MCP client and its transports from @frontmcp/protocol/client #942, the new test fails for both bundles and names the MCP client modules, so it catches that regression.node_modules/acorn/dist/acorn.mjs,node_modules/acorn-walk/dist/walk.mjs, astring under@enclave-vm/ast, the MCP SDK'sdist/esm/client/*.jsandlibs/protocol/dist/esm/client.mjsandclients.mjs, and don't match@enclave-vm/ast/esm/redos.mjsor the MCP SDK's server modules.Summary by CodeRabbit