Cross-language static code analysis tool built on MetaAST.

MetaCredo is a static analysis tool that operates on the unified MetaAST representation provided by Metastatic. Write a check once and run it across all languages supported by Metastatic: Elixir, Python, Ruby, Haskell, Erlang, Cure, March, JavaScript, TypeScript, and more.

Usage

# Run all checks
$ mix metacredo

# Run with strict mode (normal+ priority)
$ mix metacredo --strict

# Run diff-based analysis on changed files
$ mix metacredo --diff --strict

# Emit GitHub Actions workflow commands (inline PR annotations)
$ mix metacredo --diff --format github

# Generate default configuration file (.metacredo.exs)
$ mix metacredo.gen.config

Programmatic API

alias MetaCredo.{Execution, SourceFile}

source_files = MetaCredo.Sources.find("lib/")
report = Execution.run(files_included: ["lib/"])

Enum.each(report.issues, fn issue ->
  IO.puts("#{issue.filename}:#{issue.line_no} #{issue.message}")
end)