Fallow: codebase intelligence for TypeScript and JavaScript

Fallow analyzes code and styles for changed-code risk, cleanup opportunities, circular dependencies, duplication, complexity hotspots, architecture boundary violations, design-system styling drift, feature flags, and opt-in security candidates. Runtime coverage merges production execution data into the same fallow health report for hot-path review and cold-path deletion confidence. A single local capture is available by default. Continuous or cloud runtime monitoring is optional.

When to Use

• Find cleanup opportunities: unused files, exports, types, members, dependencies, or feature flags that guard unused exports.
• Detect code duplication, circular dependencies, architecture boundary issues, and complexity hotspots.
• Find functions that may implement the same intent despite different names, syntax, or control flow (fallow similar-code).
• Check styling consistency, CSS dead surface, and design-token drift.
• Audit changed code before a commit, PR, release, or refactor.
• Set up CI quality gates, duplication thresholds, and regression baselines.
• Auto-fix supported unused exports and dependencies after --dry-run.
• Investigate why a specific export, dependency, file, or issue type was reported.
• Surface local security candidates for an agent to verify (fallow security).
• Find untested but runtime-reachable code (fallow health --coverage-gaps).
• Rank complexity hotspots, owners, and refactoring targets (fallow health --hotspots --ownership --targets).
• Review what fallow has surfaced over time (fallow impact).
• Confirm exact TypeScript symbol use, affected tests, API leaks, or public type coupling when syntactic evidence is insufficient (--type-aware).