TypeScript

Overview Learning objectives What you’ll learn Key facts Module listing FAQs What our customers say Get in touch

Course overview

This hands-on TypeScript course is tailored for JavaScript professionals aiming to deepen their skills. Learn how to write scalable, reliable code and apply best practices that support long-term project success.

Essential TypeScript skills for advanced JavaScript developers

Designed for JavaScript developers ready to work more effectively with TypeScript, this two-day course focuses on the language features and coding practices used in typed application development. You’ll build your confidence with type definitions, object structures, reusable functions and class-based design, then apply these techniques through guided coding tasks. It is suited to developers moving beyond core JavaScript who want to strengthen their technical profile, contribute to more consistent codebases and support higher-quality delivery in front-end, back-end or full-stack roles.

Learning objectives

Configure a TypeScript project
Define typed variables and objects
Model data with interfaces
Work with unions and aliases
Apply control flow narrowing
Create generic functions
Use advanced type utilities
Structure class-based TypeScript code
Improve consistency across codebases

What you’ll learn

TypeScript becomes valuable when developers can use it to make better decisions in everyday coding, not just add annotations. This course shows how typed structures, functions, objects and classes help you spot issues earlier, communicate intent more clearly and work with JavaScript codebases that are becoming harder to manage through JavaScript alone.

Define clearer data structures

You will learn how to describe values, objects and relationships in a way TypeScript can understand, making data expectations visible across the code. This matters because unclear data structures create guesswork between developers and increases the risk of inconsistent handling. By defining object shapes, relationships and expected values more clearly, you can support cleaner collaboration, faster reviews and fewer issues caused by misunderstood data.

Make logic safer

Explore how TypeScript helps refine what a value can be as code moves through different conditions. This is essential when developers are handling variable inputs, optional values or branching logic, where small assumptions can lead to unexpected behaviour. By using TypeScript to make those possibilities clearer, you can write code that is easier to reason about, simpler to review and more reliable as requirements become more complex.

Create reusable functions

Learn how to design reusable functions using generics, typed parameters and clear return types, to ensure that code can support different scenarios without becoming harder to understand. This matters because repeated logic slows teams down, increases the risk of inconsistent behaviour and makes future changes harder to control. Stronger function design also helps teams extend features more efficiently while keeping shared code easier to review, adapt and maintain.

Structure application code

Examine how classes and related TypeScript features can support clearer application structure, otherwise poorly organised code can make responsibilities harder to trace, slows down collaboration and increases the effort needed to make safe changes. By learning how to organise responsibilities, access and relationships more clearly, you can contribute to codebases that are more consistent, maintainable and better suited to team-based development.

What’s included

Instructor-led training over two-days
Live virtual classroom environment
Hands-on exercises and live labs
All relevant course materials

Key facts

Certification

This includes a certificate of attendance on course completion.

Who it’s for

This course is suitable for developers with JavaScript experience who want to adopt TypeScript for more scalable development.

Prerequisites

This course requires familiarity with JavaScript, particularly ES6 syntax.

Exam information

This course does not include an exam.

Optional extras

This course includes hands-on labs and access to learning materials for continued practice.

Pre-course

No preparation work is required for this course.

Full module listing

Click on each day below to see the breakdown of the modules that you'll cover on the course

Day one

Day two

Day one

Session 1: INTRODUCTION

TypeScript vs. JavaScript
Installing TypeScript
Static type checks
Non-exception failures
Compiling TypeScript to JavaScript
Explicit types
Strictness flags

Session 2: TYPES

Primitive types
Array types
Variable and function type annotations
Object types
Union types
Aliases
Interfaces
Assertions
Literal types
null and undefined types
Other types

Session 3: NARROWING

What is narrowing?
Type guards
Truthiness
Equality
Membership
instanceof
Assignments
Control flow analysis
Type predicates

Session 4: FUNCTIONS

Function type expressions
Call signatures
Construct signatures
Generic functions
Generic constraints
Optional parameters
Optional parameters in callbacks
Overloading
Using this in functions
Rest parameters and arguments (spread)
Parameter destructuring
void return type

Day two

Session 5: MORE ABOUT OBJECT TYPES

Optional property modifier
Readonly property modifier
Index signatures
Extending types
Intersecting types
Aliases or interfaces?
Generic object types
Array types
Tuple types

Session 6: TYPE MANIPULATION

What is type manipulation?
Generics
keyof
typeof
Indexed access types
Conditional types
Mapped types
Utility types

Session 7: CLASSES

Class members
Fields
Constructors
Methods
Getters and setters
Class heritage
extends
implements
Member visibility
Static members
Generic classes
Handling this
Arrow functions
Parameter properties
Class expressions
Abstract classes and members
Relationships between classes

Session 8: BEST PRACTICES

General types
Generics
The any type
Callback types
Function overloads
Others

FAQs

During the two-day TypeScript course, JavaScript developers will build the practical judgement needed to work with typed application code. It covers configuration, data modelling, functions, classes and advanced type features, with exercises that show how TypeScript can support clearer decisions, safer changes and more consistent development practice.

Is this course right for experienced JavaScript developers?

Yes. This course is designed for developers who already understand JavaScript and want to use TypeScript with more confidence. It is particularly relevant if you work on shared codebases, growing applications or projects where clearer structure would help reduce ambiguity, improve reviews and make future changes easier to manage.

What practical skills will I build?

You will work with TypeScript configuration, typed values, object structures, interfaces, unions, narrowing, generics, classes and advanced type features. The focus is on using these skills in practical development tasks, heloing you make stronger decisions when designing functions, modelling data and organising application code.

How can TypeScript help in day-to-day development?

TypeScript helps developers make assumptions visible in the code. That matters because unclear data shapes, flexible inputs and repeated logic can lead to avoidable errors or slower reviews. By using TypeScript well, you can make code easier to understand, test, extend and discuss with other developers.

Is the course only relevant to front-end developers?

No. The course is suitable for developers working across front-end, back-end or full-stack environments, provided they already have JavaScript experience. It is also useful for technical testers, SDETs and automation specialists who work with JavaScript-based test frameworks or need to understand TypeScript application code. Stronger type information can make code easier to review, debug and maintain, which supports more reliable development and testing activity.

Will the course include hands-on coding?

Yes. The course includes practical coding exercises and live labs that help reinforce the concepts covered during training. You will have opportunities to apply TypeScript features as you learn them, rather than only discussing syntax or theory. This practical format helps you build confidence with typed structures, functions and application patterns in a supported environment before applying them in your own development or testing work.

What our customers say

“Great course. Alan has been courteous and informative throughout. Highly recommended, and will absolutely be coming back for more courses.”

Bradley, Software Engineer, Government

“Tarn is an excellent instructor, enthusiastic and knowledgeable.”

Raymond, Developer, Government

Why study with TSG?

25+ years' experience

Trusted by individuals, businesses and public sector organisations for over 25 years.

20,000+ learners trained

Join a network of learners focused on developing their software testing skills

98% customer satisfaction

TSG trainers are frequently rated as ‘good’ or ‘excellent’ by our learners

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