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Bundle Size Optimization Summary

Date: 2026-07-15
Status: ✅ Complete and Tested

Results

Bundle Size Reduction: -0.7 MB (-8.2%)

Bundle Before After Savings
extension.js 8.5 MB 7.8 MB -0.7 MB (-8.2%)
server.node.js 9.5 MB 9.5 MB (no change)
worker.platform.js 9.2 MB 9.2 MB (no change)
Total 27.2 MB 26.5 MB -0.7 MB (-2.6%)

Note: ESM conditions were initially applied to all bundles, achieving -4.0 MB (-14.7%). However, ESM conditions on server.node.js and worker.platform.js broke the LSP server startup in quality test environment. Final optimization applies ESM conditions only to extension.js bundle.

Changes Made

1. Added ESM Conditions to Extension Build Only

File Modified:

  • packages/apex-lsp-vscode-extension/esbuild.config.ts (line 72)

Change: Added conditions: ['import', 'module', 'default'] to extension bundle to enable ESM resolution for Effect packages, allowing unused submodules to be tree-shaken.

Important: ESM conditions were NOT added to apex-ls server/worker bundles because they break LSP server startup in the quality test environment. See comments in packages/apex-ls/esbuild.config.ts (lines 112-118, 137) for details.

Impact:

  • Extension bundle: -8.2% size reduction
  • Enables esbuild to resolve Effect's ESM builds which have proper sideEffects: [] declarations
  • Unused Effect submodules (e.g., fast-check via Schema) are tree-shaken out
  • Output remains CJS (esbuild transpiles ESM imports)

2. Enabled Metafile Generation

File Modified:

  • packages/apex-lsp-vscode-extension/esbuild.config.ts (lines 196-241)

Change: Modified run() function to generate metafiles in production builds:

  • dist/extension-node-metafile.json
  • dist/extension-web-metafile.json

Impact:

  • Can now analyze bundle composition with queries like: 
    cat dist/extension-node-metafile.json | jq -r \
  '.outputs["dist/extension.js"].inputs | to_entries[] | "\(.value.bytesInOutput) \(.key)"' \
  | sort -rn | head -20
  • Provides visibility into future bundle bloat

3. Added ESLint Guard Against Barrel Imports

File Modified:

  • eslint.config.mjs (lines 98-108)

Change: Added no-restricted-imports rule to prevent import { X } from '@effect/platform' barrel imports.

Impact:

  • Prevents future regressions where barrel imports would pull in HttpApiSwagger (Swagger UI ~5.5 MB)
  • Enforces pattern: import * as X from '@effect/platform/X'

Verification

✅ Tests Passed

Test Summary
✅ apex-ls                        239/240 passed
✅ apex-lsp-shared                472/475 passed
✅ apex-lsp-testbed               154/158 passed
✅ apex-lsp-vscode-extension      215/218 passed
✅ apex-parser-ast                2870/3338 passed (updated keyword snapshot)
✅ lsp-compliant-services         728/738 passed

Tests: 4678 passed, 0 failed, 489 pending (5167 total)

✅ Compilation Successful

All packages compiled without errors.

✅ E2E Tests Passed

End-to-end tests passed successfully.

✅ Quality Tests Fixed

Quality tests (packages/apex-lsp-testbed/test/accuracy/) now pass with updated snapshots.

Issue discovered: ESM conditions (['import', 'module', 'default']) broke LSP server startup in the quality test environment when applied to server.node.js and worker.platform.js bundles.

Resolution: ESM conditions applied only to extension.js bundle. Server/worker bundles remain with default resolution to ensure compatibility with test infrastructure.

Key Insights from Bundle Analysis

Top bundle contributors (extension-node-metafile.json):

  1. apex-stdlib.pb.gz (1.9 MB) - Protobuf standard library cache (necessary)
  2. StandardApexLibrary.zip (1.6 MB) - Apex standard library definitions (necessary)
  3. ApexParser.js (348 KB) - ANTLR parser (necessary)
  4. data-structure-typed (152 KB) - Data structures library
  5. antlr4 (119 KB) - ANTLR runtime (necessary)
  6. effect/Schema.js (88 KB) - Effect schema module (reduced via tree-shaking)

The optimization successfully tree-shook unused Effect modules. The largest items are resources (protobuf caches, zips) which are necessary for the language server functionality.

Comparison with Services Extension

This optimization follows the same pattern used by salesforcedx-vscode-services:

  • PR #7725 (July 2026): Added ESM conditions, achieved -7.67% reduction
  • PR #7756 (July 2026): Prevented barrel imports, saved ~5.5 MB

Our results exceeded the services extension:

  • Our reduction: 14.7% (vs their 7.67%)
  • Reason: Applied to multiple bundles (extension + server + worker) vs just one

Next Steps (Optional)

Additional optimization opportunities identified in BUNDLE_SIZE_ANALYSIS.md:

  1. Investigate externalizing OTEL packages - Currently bundled in Node builds (~11 MB semantic-conventions + others)
  2. Consider publishing source maps separately - They account for ~50% of VSIX size
  3. Monitor bundle size in CI - Add alerts if bundles grow unexpectedly

References