skill-based roadmap · Languages
TypeScript Roadmap
A structured path to mastering TypeScript for full-stack and AI engineering roles, covering core syntax, type system depth, tooling, frameworks, and production patterns.
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1. Stage 1: Foundations
JavaScript Prerequisites
TypeScript builds directly on JS fundamentals you must know first.
TypeScript Installation & Tooling
Setting up tsc and tsconfig unlocks the full TypeScript workflow.
Basic Types & Type Annotations
Explicit types catch bugs at compile time before runtime failures occur.
Functions & Type Inference
Typed function signatures document intent and prevent misuse automatically.
2. Stage 2: Core Type System
Interfaces & Type Aliases
Defining reusable shapes keeps large codebases consistent and readable.
Union & Intersection Types
Composing types models real-world data variations safely and precisely.
Enums & Literal Types
Constrained value sets eliminate entire classes of invalid-state bugs.
Narrowing & Type Guards
Runtime checks let TypeScript refine types inside conditional branches correctly.
3. Stage 3: Object-Oriented & Structural Patterns
Classes & Access Modifiers
OOP patterns with typed classes map directly to real-world domain models.
Generics
Reusable typed logic without sacrificing safety is the hallmark of professional TS.
Modules & Namespaces
Proper module boundaries keep large projects maintainable and tree-shakeable.
Declaration Files & @types
Consuming third-party JS libraries safely requires understanding ambient declarations.
4. Stage 4: Advanced Type System
Mapped & Conditional Types
Meta-level type transformations power libraries like Zod, Prisma, and tRPC.
Template Literal Types
String manipulation at the type level enables powerful API surface inference.
Utility Types
Built-in helpers like Partial, Pick, and Omit accelerate day-to-day type work.
Decorators & Metadata
Decorators underpin major frameworks like NestJS and Angular in enterprise codebases.
5. Stage 5: TypeScript with Frameworks
TypeScript with React
Typed props and hooks eliminate the most common React runtime errors at scale.
TypeScript with Node.js & Express
Server-side TS with typed request/response objects hardens backend API contracts.
tRPC & End-to-End Type Safety
tRPC eliminates API schema drift by sharing types across client and server.
Prisma ORM with TypeScript
Auto-generated database types make data-layer bugs impossible at compile time.
6. Stage 6: Tooling, Testing & Quality
ESLint with TypeScript
Linting enforces team conventions and catches logical errors beyond type checking.
Testing with Vitest or Jest
Typed unit and integration tests prove correctness and prevent regressions confidently.
tsconfig Mastery
Fine-tuned compiler options control strictness, output targets, and build performance.
Zod for Runtime Validation
Compile-time types need runtime guards; Zod bridges that gap elegantly.
7. Stage 7: Production & Job-Ready Patterns
Monorepo TypeScript with Turborepo
Shared types across packages in a monorepo require structured project references.
TypeScript for AI & LLM Engineering
Typed SDK wrappers for OpenAI and LangChain.js make AI pipelines safer.
Performance & Build Optimization
Large TS projects require incremental builds and isolated declarations to scale.
Open Source Contribution & Portfolio
Real-world typed PRs signal seniority more than any certificate can.