gsxdsm ad9a72176c FN-7669: pre-bundle @fusion/core gate-safe barrel to cut engine-core gate import-phase cost ...

Prototype and land a rebuilt-every-run esbuild bundle of the @fusion/core gate-safe barrel closure, collapsing the engine-core gate's per-fork Vite SSR import-phase cost (18 forks x ~430-file closure re-resolved from scratch) into a single file load per fork.

- Add scripts/build-engine-core-gate-bundle.mjs: esbuild-bundles packages/core/src/index.gate.ts (220 first-party files, packages:"external" so third-party/node: imports stay external, treeShaking:false to preserve side effects) into packages/core/.gate-bundle/core.mjs + core.meta.json
- Wire the builder into packages/engine/vitest.config.ts's engine-core project globalSetup (alongside the existing vitest-teardown hook) so the bundle is rebuilt fresh before every gate invocation, and repoint the @fusion/core resolve.alias at the bundled output instead of index.gate.ts source
- Place the bundle output at packages/core/.gate-bundle/ as a sibling of packages/core/node_modules/ (not nested inside it) to avoid Vite SSR's external-dep heuristic, which would otherwise silently defeat vi.mock interception for imports nested in the bundle
- Gitignore packages/core/.gate-bundle/ and add a matching ESLint ignore entry so the generated bundle text is never linted or committed
- Add esbuild ^0.25.12 as a root devDependency (pnpm-lock.yaml updated accordingly)
- Document the pre-bundling rationale, placement constraints, and measured A/B wall-time results in docs/testing.md

Verified: pnpm test:gate passes (335/335 engine-core tests, 63/63 CLI ci-shape tests), engine package typecheck clean, eslint clean on touched files.

Files changed:
 .gitignore                                |  11 ++
 docs/testing.md                           |   3 +
 eslint.config.mjs                         |  10 ++
 package.json                              |   1 +
 packages/engine/vitest.config.ts          |  50 ++++++++-
 pnpm-lock.yaml                            |   3 +
 scripts/build-engine-core-gate-bundle.mjs | 174 ++++++++++++++++++++++++++++++
 7 files changed, 247 insertions(+), 5 deletions(-)

Fusion-Task-Id: FN-7669

Fusion-Task-Lineage: 62b06b2a-4ac6-45ae-ac79-9771132bc303

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-08 04:24:30 -07:00

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