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Code Purge — Tool Reference

Python

Tool Purpose Install Command
vulture Dead functions, classes, variables pip install vulture vulture . --min-confidence 80
pyflakes Unused imports, redefined names pip install pyflakes pyflakes .
autoflake Auto-remove unused imports pip install autoflake autoflake -r --in-place --remove-unused-variables --remove-all-unused-imports .
unimport Unused imports (more accurate) pip install unimport unimport --check .
pylint Broad analysis incl. duplicates pip install pylint pylint **/*.py --disable=all --enable=W0611,W0612,R0801

Recommended stack: vulture (dead code) + autoflake --check (imports) + jscpd (duplication)

JavaScript / TypeScript

Tool Purpose Install Command
knip Dead exports, unused files, unused deps project dev dependency knip --reporter json
ts-prune Unused TS exports only npm i -g ts-prune ts-prune
depcheck Unused npm dependencies npm i -g depcheck depcheck
eslint Unused vars/imports (with plugins) project-specific eslint --rule 'no-unused-vars: error'
unimport Auto unused import removal npm i -g unimport programmatic API

Recommended stack: knip (comprehensive) + jscpd (duplication)

All Languages — Duplicate Detection

Tool Purpose Install Command
jscpd Copy-paste detection, multi-language project dev dependency jscpd . --min-lines 5 --min-tokens 50
PMD CPD Java/C++/JS duplicate detection JVM required cpd --minimum-tokens 50 --files src/
SonarQube Enterprise-grade (incl. cognitive complexity) Docker sonar-scanner

Go

# Built-in: unused imports are compile errors
go build ./...          # fails on unused imports
go vet ./...            # additional checks
staticcheck ./...       # advanced dead code (go install honnef.co/go/tools/cmd/staticcheck@latest)

Rust

cargo clippy -- -D warnings          # unused code warnings as errors
cargo +nightly udeps                 # unused dependencies

Ruby

gem install rubocop
rubocop --only Lint/UnusedMethodArgument,Lint/UnusedBlockArgument

Complexity Analysis

Tool Languages Purpose
radon Python Cyclomatic + maintainability index
lizard 20+ languages Function complexity
code-climate Multi Cognitive complexity
eslint complexity JS/TS Max complexity rule

Radon usage:

pip install radon
radon cc . -a -nb          # cyclomatic complexity, only B+ (complex) blocks
radon mi . -nb             # maintainability index, only low-grade files

Lizard usage:

pip install lizard
lizard . --CCN 10 --length 50    # flag functions with CC>10 or >50 lines

File-level unused detection

Use a language-aware import graph such as knip. Do not infer that a file is unused from filename grep alone; imports, framework registration, runtime configuration, and external consumers make that signal unreliable.

Auto-fix tools (use with caution — always backup first)

Tool What it auto-fixes
autoflake --in-place Python unused imports
isort Python import organization
eslint --fix JS/TS unused vars (with --fix-type suggestion)
knip --fix (experimental) JS/TS dead exports removal
Manual + AI Complex refactors, simplified logic