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Refactor build pipeline for performance and dev output reliability #886

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Refactor build pipeline for performance and dev output reliability #886

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ac0ecee
Refactor build pipeline for performance and dev output reliability
PeterDaveHello Sep 1, 2025
ceea9d5
Consolidate boolean env parsing and cache Sass implementation
PeterDaveHello Sep 14, 2025
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13 changes: 13 additions & 0 deletions .github/workflows/pre-release-build.yml
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Expand Up @@ -24,7 +24,20 @@ jobs:
- uses: actions/setup-node@v4
with:
node-version: 20
cache: 'npm'
cache-dependency-path: '**/package-lock.json'
- name: Detect Node major version
run: echo "NODE_MAJOR=$(node -p 'process.versions.node.split(".")[0]')" >> $GITHUB_ENV
- run: npm ci
- name: Cache Webpack filesystem cache
uses: actions/cache@v4
with:
path: |
.cache/webpack
node_modules/.cache/webpack
key: ${{ runner.os }}-node${{ env.NODE_MAJOR }}-webpack-${{ hashFiles('**/package-lock.json', 'build.mjs') }}
restore-keys: |
${{ runner.os }}-node${{ env.NODE_MAJOR }}-webpack-
- run: npm run build

- uses: josStorer/get-current-time@v2
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19 changes: 19 additions & 0 deletions AGENTS.md
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Expand Up @@ -17,6 +17,25 @@ Always reference these instructions first and fall back to search or bash comman
- Lint code: `npm run lint` -- uses ESLint.
- Safari build: `npm run build:safari` (see Platform-Specific Instructions for details)

### Build Performance Options

- BUILD_PARALLEL: Toggle parallel build of production variants
- Default: on (parallel). Set to `0` to run sequentially (lower CPU/IO spikes on low-core machines)
- BUILD_THREAD / BUILD_THREAD_WORKERS: Control Babel parallelism via thread-loader
- Default: threads enabled in dev/prod; workers = CPU cores
- Set `BUILD_THREAD=0` to disable; set `BUILD_THREAD_WORKERS=<n>` to override worker count
- BUILD_CACHE_COMPRESSION: Webpack filesystem cache compression
- Default: `0` (no compression) for faster warm builds on CPU-bound SSD machines
- Options: `0|false|none`, `gzip` (or `brotli` if explicitly desired)
- Affects only `.cache/webpack` size/speed; does not change final artifacts
- BUILD_WATCH_ONCE (dev): When set, `npm run dev` runs a single build and exits (useful for timing)
- BUILD_POOL_TIMEOUT: Override thread-loader production pool timeout (ms)
- Default: `2000`. Increase if workers recycle too aggressively on slow machines/CI
- Source maps (dev): Dev builds emit external `.map` files next to JS bundles for CSP-safe debugging; production builds disable source maps
- Symlinks: Webpack uses `resolve.symlinks: false` to improve performance and ensure consistent module identity; if you rely on `npm link`/pnpm workspaces, temporarily enable symlink resolution while developing linked packages

Performance defaults: esbuild handles JS/CSS minification. In development, CSS is injected via style-loader; in production, CSS is extracted via MiniCssExtractPlugin. Thread-loader is enabled by default in both dev and prod.

### Build Output Structure

Production build creates multiple variants in `build/` directory:
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