JavaScript, as a dynamically typed language, lacks inbuilt mechanisms to annotate or restrict variable types, leading to potential bugs and unexpected behavior. To address this, developers can use statically typed extensions like TypeScript, Flow, and PropTypes to enhance type-checking capabilities. TypeScript, developed by Microsoft, is notable for its comprehensive library support, large community, and ease of integration with popular frameworks such as Vue, Angular, and React. It offers extensive resources, documentation, and editor support features, making it a preferred choice for implementing static typing. Flow and PropTypes, developed by Facebook, also offer static type-checking but are not programming languages themselves; they serve as libraries with smaller communities and less documentation. Flow integrates with Babel and is often used with React, while PropTypes is primarily a type validator for React components. The article highlights the installation processes, performance considerations, and community support for each, with TypeScript emerging as the most widely supported and documented tool among the three.