Comparing TypeScript and PropTypes in React applications

React components use JavaScript functions that return elements to be added to the DOM, and these components can accept arguments called props, which can be type-checked using PropTypes or TypeScript. PropTypes is a runtime type-checking tool in React that provides warnings in the development environment when prop types are violated, but it doesn't show errors in production. In contrast, TypeScript offers compile-time type-checking, highlighting errors and providing insights in integrated development environments (IDEs) like VS Code. Although TypeScript has more advanced features, such as combining interfaces with types and performing conditional type checks, PropTypes remains relevant for runtime validation, especially in component libraries intended for public use. Developers can benefit from both tools by writing type definitions that generate PropTypes, using techniques like InferProps or babel-plugin-typescript-to-proptypes, to enjoy the advantages of both runtime and compile-time type-checking.