Programming languages1:1 mentoring

TypeScript

Add types to your JavaScript and catch bugs before they run, from basic annotations to generics and real projects.

Level:: Intermediate
Format:: 1:1 online mentoring

Free, no-obligation chat · Affordable plans that fit your budget · Start this week

1:1 personal attentionOne mentor, one student, at your pace.
Flexible timingsSessions that fit your week and time zone.
Affordable plansPlans that fit your budget.
Practise between sessionsShort problems that build confidence.

About this course

Learn TypeScript online

TypeScript adds a type system on top of JavaScript, and most modern front-end and Node.js projects use it. Learners often find the error messages confusing, are unsure when to write a type and when to let it be inferred, and get stuck on unions, generics and the difference between a type and an interface.

This course follows the standard TypeScript curriculum: setting up the compiler, basic and object types, unions and narrowing, functions, interfaces and type aliases, classes, generics, utility types, modules, configuration with tsconfig, and using TypeScript with React and Node.js.

Right now our free self-study lessons cover Java and Python, so TypeScript is taught through affordable 1:1 online mentoring: a mentor explains each idea, reviews your code and works at your pace. Message us on WhatsApp or email, or fill in the short form, for a free, no-obligation chat. We will suggest a plan that fits your budget and flexible timings in your time zone, and you can start this week.

Who this course is for

JavaScript learners ready for type safety
Developers joining a TypeScript codebase
React and Node.js learners who want typed projects
Students building larger projects and portfolios
Developers from Java or C# who want to learn it quickly

Outcomes

What you'll learn

Set up and configure TypeScript with tsconfig
Describe data with types, interfaces and type aliases
Use unions, literals and narrowing to handle different cases
Write generic functions and types
Use built-in utility types such as Partial, Pick and Record
Read and fix compiler errors with confidence
Type React components, hooks and props
Type a Node.js and Express API

Skills you'll gain

TypeScript
Type annotations
Interfaces
Generics
Union types
Type narrowing
Utility types
tsconfig
Modules
React with TypeScript
Node.js typing
Debugging types

Detailed syllabus

TypeScript syllabus

Every module lists its topics and what you will be able to do. Your mentor plans sessions around them and your own goals.

Module 1
Why TypeScript and getting set up
What TypeScript adds and how to run it.
- Static types versus JavaScript
- Installing TypeScript and the compiler
- tsc and watch mode
- Running with a modern runner or bundler
- Editor support and error messages
- Compiling and checking
By the end of this module you can
- Set up a TypeScript project from scratch
- Explain what the compiler does and does not check
Covered in 1:1 mentoring sessions
Module 2
Basic types
Describing simple values.
- string, number and boolean
- Arrays and tuples
- any, unknown and never
- null and undefined with strictNullChecks
- Type inference
- Type assertions
- Literal types and const
By the end of this module you can
- Annotate variables and rely on inference where it is enough
- Choose unknown over any
Covered in 1:1 mentoring sessions
Module 3
Functions and objects
Typing how code is called and what data looks like.
- Parameter and return types
- Optional and default parameters
- Function types and callbacks
- Object types
- Optional and readonly properties
- Index signatures
- Excess property checks
By the end of this module you can
- Type functions and objects accurately
- Fix common assignment errors
Covered in 1:1 mentoring sessions
Module 4
Unions, intersections and narrowing
Handling values that can be more than one thing.
- Union and intersection types
- typeof, instanceof and in guards
- Discriminated unions
- Exhaustive checks with never
- Custom type guards
- Optional chaining and nullish coalescing
By the end of this module you can
- Narrow a union safely
- Model states with discriminated unions
Covered in 1:1 mentoring sessions
Module 5
Interfaces, type aliases and classes
Naming shapes and modelling behaviour.
- Interface versus type alias
- Extending interfaces
- Classes with typed fields
- Access modifiers
- Abstract classes
- Implementing interfaces
- Enums and alternatives
By the end of this module you can
- Choose between interface and type
- Model a small domain with classes and interfaces
Covered in 1:1 mentoring sessions
Module 6
Generics
Reusable code that keeps its types.
- Generic functions
- Generic interfaces and types
- Constraints with extends
- Default type parameters
- Generic classes
- keyof and indexed access types
- Inference with generics
By the end of this module you can
- Write a generic function and constrain it
- Read a generic signature without fear
Covered in 1:1 mentoring sessions
Module 7
Utility and mapped types
Building new types from existing ones.
- Partial, Required and Readonly
- Pick and Omit
- Record
- ReturnType and Parameters
- Mapped types
- Conditional types introduction
- Template literal types
By the end of this module you can
- Derive types instead of repeating them
- Use mapped types for simple transformations
Covered in 1:1 mentoring sessions
Module 8
Modules, configuration and tooling
Organising and configuring a project.
- ES modules and imports
- Declaration files and DefinitelyTyped
- tsconfig options: strict, target, module
- Path aliases
- Linting with ESLint
- Migrating a JavaScript project gradually
- Type-only imports
By the end of this module you can
- Configure tsconfig for a project
- Migrate a small JavaScript file to TypeScript
Covered in 1:1 mentoring sessions
Module 9
TypeScript with React
Typed components and hooks.
- Typing props and children
- useState and useReducer types
- Event types
- Typing refs and effects
- Generic components
- Typing context
- Typed custom hooks
By the end of this module you can
- Build a typed React component set
- Type events and state correctly
Covered in 1:1 mentoring sessions
Module 10
TypeScript with Node.js and APIs
Typed servers and data.
- Typing Express requests and responses
- Typed environment variables
- Typing JSON and API responses
- Runtime validation versus compile-time types
- Typed error handling
- Shared types between front end and back end
By the end of this module you can
- Type a small Express API
- Explain why runtime validation is still needed
Covered in 1:1 mentoring sessions
Module 11
Testing and a typed project
Putting it all together.
- Testing typed code
- Type-safe mocks
- Reading advanced error messages
- Planning a typed project
- Git and GitHub
- Deployment
By the end of this module you can
- Finish a typed project you can explain
- Debug a complex type error step by step
Covered in 1:1 mentoring sessions

Ways to learn

How you can learn TypeScript

TypeScript mentor, 1:1 online

A mentor who knows this course plans sessions around your goal, explains each idea with fresh examples and checks your understanding. Personal attention, flexible timings in your time zone and affordable plans that fit your budget.

Talk to our team

How it works

Your learning journey

Four simple steps to start TypeScript with a mentor. A real person replies to you; there is no booking system.

Step 1: Talk to us
Message us on WhatsApp or email, or fill in the short form. The first chat is free, with no obligation.
Step 2: Get your plan
We listen to your goal, level and deadlines, then suggest a plan that fits your budget and timings.
Step 3: Learn with your mentor
Online 1:1 sessions with a mentor who knows your course, explains clearly and checks your understanding.
Step 4: Practise & track progress
Keep going between sessions with practice, and watch your confidence grow week by week.

Learn by doing

Projects and practice

Typed task manager
A small app with interfaces for tasks and users, discriminated unions for status and a generic storage helper.
Typed API client
A client that fetches JSON, maps it to typed models and handles errors with a result type.
React component library
A few typed, reusable React components with props, events and a typed form hook.
Typed Express service
A small Express API with typed routes, request bodies and validated input.

Your progress

What you'll be able to do

Milestones from the start, middle and end of the syllabus.

Set up a TypeScript project from scratch
Early on
Write a generic function and constrain it
Halfway
Finish a typed project you can explain
By the end

FAQs

TypeScript: frequently asked questions

Is there a self-study option, or is it 1:1 mentoring?

Our free self-study lessons exist only for Java and Python today. TypeScript is learned through 1:1 online mentoring, where a mentor teaches live, answers questions as they come up and shapes each session around what you need next.

How much does mentoring cost?

1:1 mentoring is personal online tutoring and is affordable, with plans that fit your budget. Tell us your goals and how often you would like sessions, and our team will suggest an option that works for you.

How do I get started?

Message us on WhatsApp or email, or fill in the short form on this page. Our team replies, talks through your goals and helps you choose a mentor and a schedule. It starts with a free, no-obligation chat, and you can start this week.

Are the sessions 1:1 and can they fit my schedule?

Yes. Every session is one-to-one and online: one mentor, one learner. Timings are flexible in your time zone, so sessions can sit around school, work and family plans.

Do I need JavaScript first?

Yes. TypeScript is JavaScript with types, so you should be comfortable with functions, arrays, objects and modules. If not, the mentor starts with the JavaScript gaps.

Is TypeScript worth learning?

Most professional front-end and Node.js projects use it, because types catch mistakes early and make large codebases easier to change.

Interface or type alias, which should I use?

Both describe shapes. Interfaces suit object shapes you may extend, and type aliases suit unions and computed types. Your mentor shows how to choose with examples.

Can sessions use my own project?

Yes. Bring your code and the mentor will help you add types and understand the errors as you go.

Free, no-obligation chat

Talk to our team about TypeScript

Tell us what you need. Our support team replies within one working day, by email or WhatsApp, whichever you prefer, and arranges your mentor.

Prefer to talk first?

Message the support team directly. We usually reply the same day.

Chat on WhatsApp Email us

Our mentors teach and explain. They never complete graded work, tests or assessments for students.

Keep going

Syllabus references

Last reviewed9 November 2026

Ready to start TypeScript?

Message us on WhatsApp or email, or fill in the short form. Our team replies with a plan that fits your goal and budget, and you can start this week.

Fill in the short form

WhatsApp Email us

Talk to us about a mentor

WhatsApp Email us

Learn TypeScript online

Who this course is for

What you'll learn

Skills you'll gain

TypeScript syllabus

Why TypeScript and getting set up

Basic types

Functions and objects

Unions, intersections and narrowing

Interfaces, type aliases and classes

Generics

Utility and mapped types

Modules, configuration and tooling

TypeScript with React

TypeScript with Node.js and APIs

Testing and a typed project

How you can learn TypeScript

TypeScript mentor, 1:1 online

Your learning journey

Step 1: Talk to us

Step 2: Get your plan

Step 3: Learn with your mentor

Step 4: Practise & track progress

Projects and practice

Typed task manager

Typed API client

React component library

Typed Express service

What you'll be able to do

TypeScript: frequently asked questions

Talk to our team about TypeScript

Related courses

JavaScript Programming

React

Node.js and Express

Web Development

Git & GitHub

Syllabus references

Ready to start TypeScript?

Learn TypeScript online

Who this course is for

What you'll learn

Skills you'll gain

TypeScript syllabus

Why TypeScript and getting set up

Basic types

Functions and objects

Unions, intersections and narrowing

Interfaces, type aliases and classes

Generics

Utility and mapped types

Modules, configuration and tooling

TypeScript with React

TypeScript with Node.js and APIs

Testing and a typed project

How you can learn TypeScript

TypeScript mentor, 1:1 online

Your learning journey

Step 1: Talk to us

Step 2: Get your plan

Step 3: Learn with your mentor

Step 4: Practise & track progress

Projects and practice

Typed task manager

Typed API client

React component library

Typed Express service

What you'll be able to do

TypeScript: frequently asked questions

Talk to our team about TypeScript

Related courses

JavaScript Programming

React

Node.js and Express

Web Development

Git & GitHub

Syllabus references

Ready to start TypeScript?