TypeScript adds static types to JavaScript, catching a whole class of errors before the code runs and making components self-documenting. For React, it means props are checked at the call site, hooks return correctly-typed values, event handlers receive properly-typed events, and your editor offers accurate autocomplete. TypeScript has become the default for serious React projects precisely because it makes large codebases safer and easier to navigate.
Most React TypeScript usage is straightforward once you know the key patterns: typing a component's props with an interface or type, letting hooks infer types or supplying explicit generics where needed, typing refs for DOM elements, and using React's built-in event types. The payoff is immediate — mistakes like passing a number where a string is expected are caught as you type.
This lesson covers the practical patterns for typing React: props and children, useState and useReducer, useRef for DOM and mutable values, event handlers, and a glimpse of generic components. The aim is fluency in the everyday typing you will do constantly, plus the judgement to type precisely rather than escaping to any.