v2.62.0 - parallel analyze, incremental churn cache, class-member globs

fallow 2.62.0 ships a parallel analyze stage, an incremental git churn cache, the missing duplication row in the --performance table, and four bug fixes around dynamic imports, class-member globs, and circular-dependency suppression.

Highlights

analyze runs in parallel

The pipeline's analyze stage now schedules its ten independent detectors across rayon worker threads. On a synthetic 24,320-file monorepo the stage drops from ~6.75s to under half a second on a 14-core machine. Real-world fixtures (next.js, preact) show a ~2x speedup with byte-identical output.

Incremental git churn cache

.fallow/churn.bin now records per-commit events keyed by last_indexed_sha. When HEAD advances from the cached SHA, fallow runs git log <cached>..HEAD --numstat and merges the delta instead of re-shelling out for the entire churn window. CI runs that fallow on every push and pre-commit hooks now hit the cache for the bulk of the work, paying only the marginal-commit cost.

usedClassMembers accepts globs

Member strings containing * or ? now compile as glob matchers, so a single rule can cover the entire family of methods a framework dispatches reflectively. "*" matches every member on a heritage-matching class, "enter*" / "*Handler" cover prefix or suffix patterns, and "on*Event" combines both. Designed for parser-generator listeners (ANTLR), code-generated bridges (protoc-ts, openapi-typescript, graphql-codegen), and abstract framework bases. Glob patterns matching zero members emit a WARN so dead allowlist entries surface.

{
  "usedClassMembers": [
    { "extends": "GrammarBaseListener", "members": ["enter*", "exit*"] }
  ]
}

Added

• usedClassMembers glob patterns, see Highlights above. Thanks @OmerGronich for the report. (Closes #254)
• overrides[].rules.circular-dependency: "off" suppresses cycles whose files all match the override glob. A cycle is suppressed when every file in the cycle resolves to Severity::Off for circular-dependency via overrides[]. Cycles touching even one non-overridden file remain reported. Thanks @OmerGronich for the report. (Closes #255)
• First-class blast-radius and importance sections on fallow coverage analyze. New --blast-radius and --importance flags surface runtime-weighted blast-radius and importance findings in the human output.
• Runtime coverage --top flag. Limits the runtime findings + hot-path display to the top N entries.

Changed

• analyze stage runs detectors in parallel, see Highlights above. Thanks @OmerGronich for the report. (Closes #259)
• Git churn cache is incremental, see Highlights above. Thanks @OmerGronich for the report. (Closes #258)
• --performance table includes the duplication stage. The combined-mode Pipeline Performance table now prints a duplication: <ms> row alongside the other stages instead of leaving the cost as an easy-to-miss parenthetical. Thanks @OmerGronich for the report. (Closes #257)

Fixed

• circular-dependency line-level inline directives now actually suppress. // fallow-ignore-next-line circular-dependency on the offending import line previously landed in stale_suppressions and the cycle still appeared in the output, even though fallow dead-code --format json recommended exactly that comment. Singular and plural slug aliases (circular-dependency vs circular-dependencies) are now interchangeable across inline directives, rules, and overrides[].rules. Thanks @pippenz for the report. (Closes #256)
• Bare () => import('./X') route callbacks credit the default export. Object-literal properties named component, loadChildren, or loadComponent whose value is () => import('./X') (or a function-expression equivalent) now credit the target module's default export as used, even when no .then(m => m.default) is spelled. Fixes the unused-export false positive on the standard Angular Router and Vue Router lazy-loading shapes. Thanks @OmerGronich for the report. (Closes #253)
• CSS @import 'pkg/subpath.css' resolves through node_modules. Tailwind v4 @import 'tailwindcss/theme.css' and @import 'tailwindcss/utilities.css' patterns no longer surface as unresolved imports or as unused-dependency on tailwindcss.

Full Changelog: v2.61.0...v2.62.0