Complete track · self-paced · project-driven

The Complete TypeScript Course, beginning to mastery.

From “what is a type?” all the way to shipping type-safe full-stack apps, publishing typed libraries, and understanding how the compiler thinks. The real TypeScript compiler checks your code live, right here in the browser — every section ends with you writing code the checker has already approved, not just reading about it.

6parts
27sections
97lessons
4projects
~90hest. time
Start the course1.1 — What TypeScript Is & Why Types Matter
Start →View dashboard

The journey — six ascending stages

I

PART I

Foundations

Beginner → Confident beginner

4 sections0%
II

PART II

Core TypeScript

Confident beginner → Intermediate

5 sections0%
III

PART III

Advanced Types

Intermediate → Advanced

4 sections0%
IV

PART IV

Professional

Advanced → Production-ready

7 sections0%
V

PART V

Applied & Specialize

Expert tracks — pick your paths

5 sections0%
VI

PART VI

Mastery

Expert → Mentor

2 sections0%

Full curriculum

I

Foundations

Beginner → Confident beginner
0%
1  Getting Started: Thinking in Types5 lessons
1.1What TypeScript Is & Why Types Matteropen →
1.2TypeScript's Story & Ecosystemopen →
1.3The JavaScript You Needopen →
1.4Setting Up Your Workshopopen →
1.5Your First Compilationopen →
2  The Type Primitives4 lessons
2.1Annotations & Inferenceopen →
2.2The Primitive Typesopen →
2.3Arrays, Tuples & Objectsopen →
2.4The Special Types: any, unknown, never, voidopen →
3  Functions with Types4 lessons
3.1Typing Parameters & Returnsopen →
3.2Optional, Default & Rest Parametersopen →
3.3Function Types & Callbacksopen →
3.4Overloadsopen →
4  Unions, Literals & Narrowing4 lessons
4.1Union Types & Literal Typesopen →
4.2Narrowing: How TypeScript Thinksopen →
4.3Discriminated Unionsopen →
4.4Type Predicates & in / instanceofopen →
Milestone project

The Type-Safe Quiz Engine

Build a deterministic quiz engine with discriminated question types, switch-based scoring, and exhaustive checks.

II

Core TypeScript

Confident beginner → Intermediate
0%
5  Object Types in Depth4 lessons
5.1Interfaces & Type Aliasesopen →
5.2Optional, readonly & Index Signaturesopen →
5.3Extending & Combining Typesopen →
5.4Structural Typing: The Duck Testopen →
6  Classes & Object-Oriented TypeScript4 lessons
6.1Classes with Typesopen →
6.2Encapsulation & Access Modifiersopen →
6.3Inheritance & Abstract Classesopen →
6.4When Not to Use Classesopen →
7  Generics: Types with Parameters5 lessons
7.1Your First Generic Functionopen →
7.2Constraints with extendsopen →
7.3Generic Interfaces, Aliases & Classesopen →
7.4Defaults, const Type Parameters & NoInferopen →
7.5Where Generics Go Wrongopen →
8  Literals, Enums & Modern Constants4 lessons
8.1Enums — and Their Sharp Edgesopen →
8.2as const — Precision on Demandopen →
8.3satisfies — Check Without Wideningopen →
8.4Choosing: Enum vs. Union vs. Const Objectopen →
9  Modules, tsconfig & the Compiler4 lessons
9.1ES Modules in TypeScriptopen →
9.2tsconfig, Demystifiedopen →
9.3Declaration Files & DefinitelyTypedopen →
9.4The Compiler Pipelineopen →
Milestone project

The Typed API Client

Build a typed API client: decoders over unknown, a generic request helper, discriminated-union results, and a satisfies-checked endpoint table.

III

Advanced Types & Type-Level Thinking

Intermediate → Advanced
0%
10  Type Manipulation I: The Building Blocks4 lessons
10.1keyof & typeofopen →
10.2Indexed Access Typesopen →
10.3Conditional Typesopen →
10.4infer — Pattern Matching for Typesopen →
11  Type Manipulation II: Transformations4 lessons
11.1Mapped Typesopen →
11.2Key Remapping with asopen →
11.3Template Literal Typesopen →
11.4Recursive Types & Their Limitsopen →
12  The Utility Types Toolkit4 lessons
12.1The Shape Shapers: Partial, Pick, Omitopen →
12.2The Set Operators: Record, Exclude, Extractopen →
12.3The Function Inspectors: ReturnType, Awaitedopen →
12.4Building Your Own Utilitiesopen →
13  Runtime Safety: Where Types End3 lessons
13.1Type Erasure & the Runtime Boundaryopen →
13.2Schema Validation with Zodopen →
13.3Branded Types & Assertion Functionsopen →
Milestone project

The Type-Level Form Engine

Build a schema-driven form engine: satisfies-checked config, value types derived with mapped and template-literal types, exhaustive rendering.

IV

Professional TypeScript

Advanced → Production-ready
0%
14  Async TypeScript3 lessons
14.1Typing Promises & async/awaitopen →
14.2Typed Fetch & Error Handlingopen →
14.3Result Types: Errors as Valuesopen →
15  Errors, Nullability & Defensive Code3 lessons
15.1Error Handling Patternsopen →
15.2Exhaustiveness: never as a Checklistopen →
15.3Living with strictNullChecksopen →
16  Testing Typed Code3 lessons
16.1Testing Fundamentals with Vitestopen →
16.2Typing Mocks & Test Doublesopen →
16.3Testing the Types Themselvesopen →
17  Tooling & Code Quality4 lessons
17.1Linting with typescript-eslintopen →
17.2Formatting & Project Hygieneopen →
17.3Debugging TypeScriptopen →
17.4Keeping the Compiler Fastopen →
18  Publishing & Sharing Typed Code3 lessons
18.1Compiling for Consumersopen →
18.2Packaging a Typed Libraryopen →
18.3Monorepos & Project Referencesopen →
19  Working on Real Codebases3 lessons
19.1Type-Checking in CIopen →
19.2Migrating JavaScript to TypeScriptopen →
19.3Reading Other People's Typesopen →
20  Using AI as a TypeScript Developer3 lessons
20.1AI as Your Pair Programmeropen →
20.2Types as Guardrails for AI Codeopen →
20.3Using AI Responsiblyopen →
V

Applied TypeScript & Specializations

Expert tracks — pick your paths
0%
21  TypeScript in the Browser3 lessons
21.1Typing the DOMopen →
21.2Events & Listenersopen →
21.3A Small App, No Frameworkopen →
22  TypeScript + React3 lessons
22.1Typing Components & Propsopen →
22.2Hooks with Typesopen →
22.3Context, Generics & Component Patternsopen →
23  TypeScript on the Server4 lessons
23.1Node + TypeScript in 2026open →
23.2Building Typed APIsopen →
23.3End-to-End Type Safetyopen →
23.4Databases with Typesopen →
24  CLI Tools & Libraries3 lessons
24.1Building a Typed CLIopen →
24.2Designing a Library's Public APIopen →
24.3Shippingopen →
25  A Taste of Type-Level Programming3 lessons
25.1Types as a Languageopen →
25.2Classic Type Challengesopen →
25.3Knowing When to Stopopen →
VI

Mastery

Expert → Mentor
0%
26  Under the Hood: How TypeScript Really Works3 lessons
26.1The Checker's Mindopen →
26.2Soundness & the Unsound Cornersopen →
26.3The Native Future: TypeScript 7 & Beyondopen →
27  Design, Architecture & Craftsmanship3 lessons
27.1Designing with Typesopen →
27.2API & Architecture Patternsopen →
27.3Becoming a TypeScript Professionalopen →
Milestone project

Ship Something Real

Design and ship a portfolio-grade TypeScript project with typed domains, validated boundaries, tests, tooling, docs, and release proof.

Completed In progress Upcoming🏆 Project — hands-on build💡 Insight — usually skipped elsewhere⚠️ Trap — classic mistake to learn early