The committed grammars for these 5 languages were built with the pre-0.25
emscripten "side module" format and fail to load with web-tree-sitter 0.26
(getDylinkMetadata error) — the multi-language parser was silently falling back
to regex for ALL of them. Rebuilt with tree-sitter-cli 0.26.9 (wasi-sdk) via
scripts/build-grammars.sh.
Verified: the WASM parser test suite now loads every grammar with ZERO
"Failed to load WASM grammar" fallbacks (was one per parse); 117 parser tests pass.
Also: build-grammars.sh installs grammar source packages with --legacy-peer-deps
(they declare conflicting tree-sitter binding peers, irrelevant since we only
consume their C source) so `build-grammars.sh all` resolves cleanly.
Integrate tree-sitter WASM as the default parser for 5 languages, replacing
regex-only parsing (~97-98%) with AST-based parsing (~100% accuracy).
- Add TreeSitterWASMParser implementing ILanguageParser for 5 languages
- Bundle only needed WASM grammars in assets/grammars/ (8.5MB vs 50MB)
- Add FallbackParser with 3-retry logic before permanent regex degradation
- Add per-call parser instances to prevent concurrency races across await
- Add cyclomatic complexity computation from AST branching nodes
- Add property extraction from class/struct AST nodes
- Add AQE_PARSER_REGEX_ONLY=1 env var for opt-out to regex
- Replace require() with ESM-compatible dynamic import() in registry
- Mark web-tree-sitter as external in CLI/MCP esbuild configs
- Amend ADR-076 with decision rationale and alternatives evaluated
Alternatives evaluated and rejected:
- @ast-grep/napi: npm package only ships JS/TS/CSS/HTML, others need native .so
- node-tree-sitter: requires native C compilation via node-gyp
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Dragan Spiridonov