TypeScript
intermediateTopic 7 of 14 in Frontend Development
What it is
TypeScript is a superset of JavaScript that adds static types. It catches errors at compile time instead of runtime, making your code more reliable and easier to refactor, especially on larger projects.
Why frontend developers need it
As projects grow, plain JavaScript becomes harder to maintain. TypeScript helps you catch bugs early, improves editor autocompletion, and makes your code self-documenting. Most modern frontend and full-stack codebases use it.
What to learn
Type annotations: string, number, boolean, arrays
Interfaces and type aliases
Union and intersection types
Generics for reusable typed functions
Enums and literal types
Type narrowing and type guards
Typing React components: props, state, events
Configuring tsconfig.json
Practice project
Typed API Dashboard
Convert an existing JavaScript React project to TypeScript. Define interfaces for all your data shapes, add types to every component, and fix any type errors that surface.