ESLint vs Psalm: What are the differences?

## Key Differences between ESLint and Psalm

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1. **Language Support**: ESLint primarily focuses on JavaScript and JSX while Psalm is designed specifically for PHP. As a result, ESLint can detect issues related to JavaScript syntax and code quality, while Psalm specializes in analyzing PHP codebases for errors and type issues.

2. **Analysis Depth**: ESLint primarily focuses on analyzing code for stylistic errors, code quality issues, and potential bugs. On the other hand, Psalm goes deeper into static analysis by providing type checking, uncovering type errors, and ensuring type safety within PHP codebases.

3. **Configuration Flexibility**: ESLint offers extensive configuration options, allowing developers to customize rules, plugins, and presets according to their specific project requirements. In contrast, Psalm has a more opinionated configuration setup, aimed at providing out-of-the-box type safety checks and reducing the need for extensive configuration.

4. **Integration with Build Tools**: ESLint integrates seamlessly with popular build tools like webpack, Babel, and IDEs, enabling developers to incorporate static analysis into their development workflows. Meanwhile, Psalm is built to work well with Composer and other PHP dependency management tools, making it a convenient choice for PHP projects.

5. **Focus on Type Safety**: One of the key differences between ESLint and Psalm is their focus on type safety. While ESLint primarily emphasizes code quality and style, Psalm places a stronger emphasis on ensuring type correctness and preventing type-related errors in PHP codebases.

6. **Community and Ecosystem**: ESLint boasts a large and active community of contributors, extensive documentation, and a wide range of plugins and presets to enhance its functionality. In comparison, Psalm has a smaller but dedicated community, focused on providing robust static analysis tools and support specifically for PHP projects.

In Summary, ESLint and Psalm are static analysis tools that cater to different programming languages, offer varying levels of analysis depth, configuration flexibility, integration with build tools, and focus on type safety in codebases, each targeting specific needs of developers in JavaScript and PHP ecosystems respectively.