ESLint React is a comprehensive set of composable linting rules designed for React and its broader ecosystem. Developed to support a wide range of renderers—including React DOM, React Native, and React Three Fiber—it offers a modern alternative to traditional tools by treating the DOM as just one of many supported targets. By prioritizing context-aware linting, this tool adapts seamlessly to different runtime environments, ensuring robust code quality for diverse project configurations.

Functionality is centered on providing high-performance, flexible rule enforcement that respects the nuances of React 19 and modern TypeScript environments. It is engineered for efficiency, allowing it to perform well even in large codebases while maintaining responsiveness in code editors and CI pipelines. Users can fully customize rule severity levels, making it simple to enforce strict standards or relax requirements based on team needs.

Some of the key features are:

• Modern Support: Native compatibility with TypeScript, React 19, and contemporary React patterns.
• Flexible Customization: Fully configurable rule severity levels, enabling tailored enforcement strategies.
• Optimized Performance: Built for responsiveness in large-scale projects and CI environments.
• Context-aware Linting: Intelligent rule application based on project configuration and code context.
• Modular Architecture: Offers a unified plugin for ease of use or individual plugins for granular control.

The tool is utilized by integrating it into a standard ESLint flat configuration. Once configured, ESLint React leverages TypeScript compiler information to enhance the accuracy of linting results. It provides various presets, ranging from bare-bones rule sets to strict, type-checked configurations, allowing developers to choose the level of enforcement that best fits their project stage. Additionally, the kit package allows developers to build and paste custom rules tailored to specific architectural needs without relying on upstream dependency changes.

Some common use cases include:

• React 19 Upgrades: Safely migrating codebases to new React 19 features with automated suggestions for API replacements.
• Type-Checked Linting: Enforcing strict coding standards in TypeScript projects by utilizing deep type information.
• Custom Rule Development: Creating specialized, project-specific linting logic using the provided toolkit.
• Large Codebase Maintenance: Enforcing consistent architecture and preventing common React pitfalls across thousands of files.