Fallow - Codebase Intelligence

Version updated for https://github.com/fallow-rs/fallow to version v2.47.0.

  • This action is used across all versions by 9 repositories.

Action Type

This is a Composite action.

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Action Summary

Fallow is a static analysis tool designed for TypeScript and JavaScript codebases, offering insights into unused code, duplication, complexity, and architectural issues. It automates codebase cleanup, improves maintainability, and provides runtime intelligence for identifying execution paths in production. With zero configuration and sub-second analysis, it simplifies identifying inefficiencies and enforcing code quality, making it a valuable asset for teams focused on clean and efficient development workflows.

What’s Changed

Highlights

  • Native Node.js bindings (@fallow-cli/fallow-node). New async NAPI-RS bindings expose the main fallow analyses directly inside Node without spawning the CLI. Same JSON envelopes as --format json, structured FallowNodeError, platform binaries for macOS (arm64/x64), Linux (x64/arm64 gnu + musl), and Windows x64.

    npm install @fallow-cli/fallow-node

    import { detectDeadCode, detectDuplication, computeHealth } from '@fallow-cli/fallow-node';

const deadCode = await detectDeadCode({ root: process.cwd(), explain: true });
const dupes = await detectDuplication({ root: process.cwd(), mode: 'mild', minTokens: 30 });
const health = await computeHealth({ root: process.cwd(), score: true, ownershipEmails: 'handle' });

    See https://docs.fallow.tools/integrations/node-bindings for the full API reference.

Fixed

  • Benchmark harness JSON parsing hardened against partial / malformed runs.
  • Benchmark validity gate tightened; cross-category totals now enforced.
  • Redundant plugin config scans removed on large monorepos.
  • unused-listed-deps no longer false-positives on tsconfig.json paths aliases that point at non-existent prefixes.

Internal

  • NAPI bindings wrapper no longer silently truncates maxCyclomatic / maxCognitive above u16::MAX; typed InvalidArg error instead.
  • cargo shear is clean again; stray tokio dep on the new NAPI crate removed.
  • sync-npm-versions.sh now also rewrites the version strings NAPI-RS bakes into crates/napi/index.js so strict NAPI_RS_ENFORCE_VERSION_CHECK consumers do not see spurious mismatches after a bump.

Full Changelog: https://github.com/fallow-rs/fallow/compare/v2.46.0...v2.47.0