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Knip Scans JS/TS Codebases for Unused Files, Deps, and Exports in One Pass

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Developer tool Knip, created by Lars Kappert, identifies unused dependencies, files, and exports in JavaScript and TypeScript projects through a single command. Long-lived codebases commonly accumulate dead code that never breaks the build, making it invisible to compilers and tests while silently increasing bundle size and onboarding complexity. Knip cross-references all three categories against the actual import graph, offering a level of precision that existing partial tools for other languages do not match. The tool requires some initial configuration via a knip.json file to avoid false positives, particularly around dynamic imports and framework-specific entry points. While the author praises its effectiveness, they note its reliance on the TypeScript compiler limits it to the JS/TS ecosystem, leaving a similar gap unaddressed in Python, Go, and Rust.

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