Programming Language

TypeScript Learning Roadmap

TypeScript is JavaScript with types — and it's become the default for serious frontend and full-stack development. Learning TypeScript makes you dramatically more hireable: most job postings at tech companies now list it as required, not optional.

Total time

2–4 months

Stages

5 stages

Job-ready at

Stage 3

Career paths

3 paths

Stage 1: TypeScript Foundations

Add types to your JavaScript

2–3 weeks

Topics to cover

What TypeScript is and the compilation stepBasic types: string, number, boolean, null, undefinedType inference — when TS figures it outExplicit type annotationsArrays and tuplesInterfaces vs type aliasesOptional and readonly propertiesFunction signatures and return typesEnumstsconfig.json basics

Bold = especially important

Milestone

You can add TypeScript to an existing JavaScript project and annotate variables, function parameters, and return types without fighting the compiler.

Stage 2: Advanced Types

Use TypeScript's full power

3–4 weeks

Topics to cover

Generics — reusable typed functionsUnion types and intersection typesLiteral types and type narrowingtypeof and instanceof type guardsDiscriminated unionsUtility types: Partial, Required, Pick, OmitRecord, ReturnType, ParametersTemplate literal typesMapped typesConditional types

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Milestone

You write generic utilities and understand how major libraries like React, Zod, and Prisma use advanced TypeScript. You stop fighting the type system.

Stage 3: TypeScript with React

✓ Min. Job Ready

Type your components and hooks

2–3 weeks

Topics to cover

Typing React component propsReact.FC vs function declarationsTyping useState, useRef, useReducerTyping event handlers: MouseEvent, ChangeEventTyping custom hooksTyping context and providersGeneric componentsTyping API responsesStrict mode and catching common bugsZod for runtime validation + type inference

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Milestone

You write fully typed React applications with no `any` types. Your code matches what you see in professional TS/React codebases.

Stage 4: Patterns & Configuration

Architect TypeScript projects

2–3 weeks

Topics to cover

Strict TypeScript: noImplicitAny, strictNullChecksModule resolution and path aliasesDeclaration files (.d.ts)Type-safe API clients: tRPC or typed fetchPrisma or Drizzle — type-safe database queriesType-safe environment variablesMonorepo TypeScript setupDecorators and metadata (NestJS pattern)ESLint TypeScript rulesMigrating a JS codebase to TS

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Milestone

You can set up and maintain TypeScript configuration for a production codebase, and help a team migrate from JavaScript to TypeScript.

Stage 5: Full-Stack TypeScript

End-to-end type safety

Ongoing

Topics to cover

🔷 Next.js: typed server components and actions🔗 tRPC: end-to-end typed APIs🗄️ Prisma: generated types from your database schema🛡️ Zod: runtime validation that generates TS types🧪 Testing: typed Vitest + Testing Library☁️ Cloudflare Workers with TypeScript🔒 Type-safe authentication (NextAuth v5, Lucia)📡 GraphQL with TypeScript (GraphQL Code Generator)

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Milestone

You build end-to-end type-safe applications where types flow from the database schema all the way to the UI — eliminating entire classes of runtime bugs.

What to learn next with TypeScript

Skills that pair directly with TypeScript in job postings

React

React + TypeScript is the standard frontend combination

Next.js

Next.js is built with TypeScript and expects typed code

Node.js

TypeScript on the backend with Express or Fastify

SQL

Type-safe database queries with Prisma or Drizzle

Git

Version control — required for every job

Career paths that use TypeScript

Frontend Developer Full Stack Developer Backend Developer

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