feat(lang): add Rust and TypeScript analyzer support#1

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donnfelker wants to merge 38 commits intomainfrom

feat/multi-language-support

Commits on Apr 16, 2026

Add multi-language support design doc and implementation checklist

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feat(lang): Part A1 — language abstraction layer

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feat(lang): Part A2 — extract Go analyzer into goanalyzer package

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feat(lang): Part A3 — parameterize diff parser with FileFilter

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feat(lang): Part A4 — route analyzers through language interfaces

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feat(lang): Part A5 — regression gate; preserve churn score simple-counter

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feat(lang): Part B — multi-language orchestration

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fix(diff): restore .go detection after Filter refactor
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feat(rust): C0-C1 scaffold rustanalyzer package with FileFilter

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feat(rust): C2 — FunctionExtractor via tree-sitter

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feat(rust): C3 — cognitive complexity calculator and scorer

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feat(rust): C4 — ImportResolver reads Cargo.toml and scans use/mod edges

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feat(rust): C5 — AnnotationScanner for mutator-disable annotations

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feat(rust): C6 — MutantGenerator emits canonical + Rust-specific operators

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feat(rust): C7 — MutantApplier does text-based edits with re-parse gate

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feat(rust): C8 — TestRunner via cargo test with temp-copy isolation

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feat(rust): C9 — broaden some_to_none beyond return context

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feat(ts): D0-D1 scaffold tsanalyzer package with FileFilter and detector

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feat(ts): D2 — FunctionExtractor tests and .tsx grammar fixture

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feat(ts): D3 — cognitive complexity calculator and scorer

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feat(ts): D4 — ImportResolver reads package.json and scans imports

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feat(ts): D5 — AnnotationScanner tests

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feat(ts): D6 — MutantGenerator tests for canonical and TS operators

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feat(ts): D7 — MutantApplier does text-based edits with re-parse gate

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feat(ts): D8 — TestRunner tests via fake shell command

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fix(ts): align @/ alias resolver with ~/ semantics

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fix(ts): extend detector prune list to cover framework build dirs

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test(ts): cover bare-form branch_removal and .mjs/.cjs exclusion

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fix(rust): count logical ops in if let / while let conditions

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refactor(rust): collapse one-shot child-lookup loops

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feat(eval): E1 — mixed-repo end-to-end integration test

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feat(eval): EVAL-1 harness + EVAL-2 Rust correctness cases

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feat(eval): EVAL-3 TypeScript correctness cases

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feat(eval): EVAL-4 cross-cutting multi-language suite

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ci: E2 — eval targets + Rust/Node toolchains in CI

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docs: E3 — README multi-language support

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docs: align README TS extensions with analyzer + record multi-lang follow-ups

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docs: trim README TS extension list to match analyzer (.ts, .tsx only)

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