uber/piranha

Health v2 · maintenance only

Adoption not part of the score

2472 stars · 210 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

PolyglotPiranha is a lightweight code transformation toolset from Uber for automating large-scale code changes, primarily cleaning up stale feature flag code. It works via concrete-syntax/AST-based rewrite rules and is available as a Python library (polyglot-piranha) or a Rust CLI.

Use cases

• remove stale feature flag code from a codebase
• automate large-scale code refactoring across many files
• replace feature toggle conditionals with constant values
• clean up dead code after flag cleanup
• write custom rewrite rules for Java, Swift, or JavaScript

When to choose

• you need to delete or simplify code guarded by feature flags at scale
• you want rule-based, syntax-aware automated code edits in Java, Swift, Objective-C, or JavaScript
• you want a scriptable Python API plus CLI for code transformations

When to avoid

• you need languages beyond those Uber supports (check forks for extras)
• you want a general-purpose IDE refactoring tool with interactive previews
• your transformations require full semantic analysis rather than syntax-level matching

Facets

cli-tool · maturity active

developer-tools parser workflow-automation developer-tools programming-languages cli python rust feature-flags code-refactoring stale-flag-cleanup ast-transformation static-analysis polyglot automation linux macos

Member repositories

For agents

markdown · JSON · MCP: product_card(name="uber/piranha")