Advanced TypeScript Mastery

Purpose: A curated, example‑driven curriculum to teach & learn elite TypeScript engineering practices. Every unit: concise explanation + minimal, high‑signal examples + stretch ideas.

Philosophy:

• Type safety as a design tool, not ceremony
• Prefer precise, intention‑revealing types over broad any/unknown
• Model invariants in types first, then implement
• Measure type performance when complexity grows
• Leverage generics + inference to remove duplication

Learning Style:

1. Read the short concept explanation
2. Study minimal examples (copy into playground or run pnpm dev later once added)
3. Attempt the practice prompts (TBD) before viewing solutions
4. Refactor for clarity + performance

Directory Structure (incrementally filled):

chapters/
  01-core-mastery/
  02-in-practice/
  03-frontend-excellence/
  04-backend-infra/
  05-interviews-systems/

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Chapter 1: TypeScript Core Mastery

Unit 1: Advanced Types

Covers mapped, conditional, infer, template literal types, distributivity, variance. See: chapters/01-core-mastery/unit-01-advanced-types/README.md

Unit 2: Utility Types & Custom Generics

Deep dive into built-ins + crafting powerful reusable helpers.

Unit 3: Type Inference & Narrowing Strategies

Control inference, contextual typing, exhaustiveness, branded types.

Unit 4: Strictness & tsconfig Optimization

Purpose of each strict flag, layering configs for monorepos, performance impacts.

Unit 5: Type System Performance

Complexity patterns, avoiding exponential conditional types, benchmarking tools.

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Chapter 2: TypeScript in Practice

1. Type-Safe APIs (REST, GraphQL, contract-first)
2. Error Handling (Result/Either, discriminated unions, ergonomics)
3. Event / Pub-Sub Patterns (typed channels, CQRS hints)
4. Typed Config & Environment (runtime validation + compile-time safety)
5. Type-Safe Testing (Vitest + assertion type guards + zod + tsd style checks)

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Chapter 3: Frontend Excellence

1. React Strict Typing (generic components, polymorphic as prop)
2. Hooks & Context Patterns (context factories, avoiding undefined)
3. State Management (Redux Toolkit, Zustand, signal patterns, exhaustive actions)
4. UI Library Interop (augmenting module types, Tailwind IntelliSense, shadcn challenges)
5. Type-Safe Forms (React Hook Form + Zod inference pipeline)

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Chapter 4: Backend & Infra

1. Node Patterns (DI, clean architecture boundaries)
2. Type-Safe DB Layer (Prisma, Drizzle, repository abstractions)
3. Async & Concurrency (workers, queues, cancellation tokens)
4. CI/CD & Monorepos (project references, solution style tsconfigs)
5. Observability (typed logs, metrics contracts, trace contexts)

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Chapter 5: Interviews & Systems Design

1. DSA with Strong Typing (generic data structures, phantom types)
2. System Design Mock (schema -> contracts -> impl)
3. Code Smells & Refactors (anti-pattern fixes via types)
4. Advanced Paradigms (FP, OOP, DDD blended in TS)
5. Final Project (spec → contracts → generators → implementation)

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How To Use Immediately

• Explore Chapter 1 Unit 1 first.
• Run examples (will add runnable harness in src/ soon).
• Add your own variants under playground/ and keep strict mode ON.

Next Steps

• Populate each unit with exercises & test-driven type challenges.
• Add scripts to run type performance benchmarks.

Contributions Welcome (Guidelines TBD).