TypeScript Roadmap

TypeScript adds static types to JavaScript, catching bugs at compile time rather than in production. This roadmap maps the path from the core type system through advanced type patterns to shipping real TypeScript in React and Node. It's aimed at JavaScript developers who want stronger tooling, fewer runtime surprises, and better collaboration on larger codebases. Every phase points to free resources, and you finish with a shipped typed project. Plan on 2 to 4 months at around 10 hours a week.

2–4 months

4 phases

~16 weeks

The whole path at a glance~2–4 months

Phase 1: TypeScript Basics

intermediate

1 week

Type Annotations

Explicit types on variables, function parameters, and return values. The foundation the rest of the type system builds on.

intermediate

1 week

Interfaces & Type Aliases

Define the shape of objects. Use interface for object shapes you'll extend; use type for unions, intersections, and computed types.

intermediate

1 week

Union & Intersection Types

Union types (A | B) for values that can be one of several types; intersection types (A & B) for objects that must satisfy multiple constraints at once.

Phase 2: Generics & Advanced Types

intermediate

2 weeks

Generics

Write functions and types that work across many types while preserving type information. The pattern behind most typed utility libraries.

intermediate

1 week

Utility Types

Partial, Required, Pick, Omit, Record, Readonly. TypeScript ships with a library of type transformers you'll use constantly in real codebases.

intermediate

1 week

Discriminated Unions

Model state machines and tagged variants cleanly. The pattern TypeScript developers use to eliminate impossible states.

Phase 3: TypeScript in Practice

intermediate

2 weeks

TypeScript with React

Type component props, hooks, event handlers, and context. React with TypeScript is the default in most production frontend codebases.

intermediate

2 weeks

TypeScript with Node.js

Type Express routes, middleware, and database queries. Add Zod for runtime validation that keeps TypeScript honest at system boundaries.

intermediate

1 week

tsconfig & Strict Mode

Learn the key tsconfig.json settings and enable strict mode. Strict is non-negotiable in professional TypeScript work; it catches the most bugs.

Phase 4: Portfolio Project

intermediate

3 weeks

Project Scope

Build a full-stack TypeScript app: a typed Node/Express API with a React frontend. Keep scope tight: one resource (notes, tasks, bookmarks) done well is better than a half-finished ambitious project.

intermediate

1 week

Code Quality

Enable strict mode and eslint-plugin-@typescript-eslint. Fix every red squiggle before calling it done. This is the bar senior developers expect from TypeScript code.