2/21/2023 0 Comments Detect it easy alternativeThe no-unused-vars ESLint rule is an excellent tool for dead code detection. Most of the behavior described above is configurable and can be tweaked to fit specific project needs. Find more information on ESLint rules and how to configure them here. The "extends": "eslint:recommended" property in the same file also enables the rule. To enable the rule, you can simply add it to the rules object in your ESLint configuration file. When a function definition destructures an array, unused entries from the array also cause warnings. Unused recursive functions also cause warnings. Second, it will tell us if there are unused arguments in our functions: // By default, unused arguments cause warnings. A read for a modification of itself is not considered as used. Write-only variables are not considered as used. First, it will tell us if we have declared a variable that is not used elsewhere in the file: // Variable is defined but never used This rule protects us from introducing dead code in two ways. Among many other useful things, ESLint allows us to detect unused variables in our files with its aptly named no-unused-vars rule. It is - or at least should be - an integral part of every JavaScript project. Using ESLint to detect and remove dead codeĮSLint is perhaps the most widely used JavaScript linter, with nearly 25 million weekly downloads on npm. Bonus: Detect unused dependencies with depcheck.Using ESLint to detect and remove dead code.In this article, we’ll cover three ways to detect dead code in your frontend project, plus an extra bonus section: The best way to avoid these pitfalls is to ensure we have the appropriate tooling in place to allow us to detect dead code both reliably and automatically. It also has the potential to create confusion within the development team as to which pieces of code are relevant and actively worked on and which ones can be safely ignored. Dead code makes the codebase substantially harder to maintain at scale. Having a large amount of dead code in a project can be detrimental to your app for many reasons. How to detect dead code in a frontend project Iva Kop Follow I am a self-taught software developer passionate about frontend development and architecture.
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