Formation TypeScript

Perfectionnez votre maîtrise de JavaScript grâce à TypeScript : un langage de programmation signé Microsoft qui permet d'ajouter des typages statiques pour rendre plus facilement maintenable son code.

All Levels
15 hours
4.9 / 5
92 reviews
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3,304 learners
Formation TypeScript

Overview

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Bienvenue dans notre formation TypeScript !

Si vous avez envie de perfectionner votre maîtrise de JavaScript, vous êtes au bon endroit.

Créé comme réponse aux aspects "négatifs" de JavaScript, Microsoft a développé TypeScript, un langage de programmation qui reprend toutes les fonctionnalités de JavaScript, en y ajoutant une couche de règles et de typages statiques.

En d'autres termes, TypeScript permet de définir à l'avance les types de données que nous souhaitons récupérer.

Sa puissance est telle que TypeScript est aujourd'hui utilisé dans l'immense majorité des entreprises : Netflix, Facebook ou encore Google.

Apprenez dès aujourd'hui à maîtriser l'un des langages de programmation qui met tout le monde d'accord.

Course Outline

31 parts8 quizzes

Avant de commencer

On prend le temps de faire connaissance pour bien démarrer cette formation TypeScript ! Ici, on apprend à poser nos questions et à réussir notre formation.

4 min4 sessions
Bienvenue dans cette formation !1 min
Prérequis1 min
Comment réussir cette formation ?1 min
Comment poser mes questions ?1 min

Partons sur de bonnes bases

TypeScript, c'est quoi ? C'est tout l'objectif de cette section avant d'attaquer.

37 min7 sessions
Qu'est-ce que TypeScript ?2 min
JavaScript contre TypeScript : le problème qu'il résout14 min
Utiliser TypeScript sans rien installer avec TypeScript Playground2 min
Aperçu sur TypeScript10 min
Installons TypeScript6 min
Installons Visual Studio Code1 min
Quelles extensions installer ?2 min

Quelques rappels sur les nouveautés de JavaScript

Un bon développeur TypeScript est avant tout un bon développeur JavaScript. On en profite donc dans cette partie pour faire un point sur les dernières nouveautés.

54 min10 sessions
Revoyons ensemble les nouveautés de JavaScript1 min
Oubliez "var", utilisez "let" et "const"8 min
Les fonctions fléchées10 min
Les objets6 min
Les classes (constructeur, propriétés et méthodes)10 min
Les modules (import et export)6 min
L'affectation par décomposition3 min
Le REST parameter2 min
Les types primitifs et les types par référence7 min
Nous voici prêts pour apprendre à utiliser TypeScript1 min

Testons nos connaissances

Interactive Quiz4 questions

And at the end of this course?

Here's what you'll concretely be able to do.

  • Installer TypeScript et identifier ses apports par rapport à JavaScript
  • Annoter des données avec les types fondamentaux
  • Typer rigoureusement des fonctions (paramètres, valeurs de retour, void, never)
  • Modéliser des données avec les interfaces et les alias de types
  • Implémenter la POO typée avec les classes (public, private, readonly, getters, setters)
  • Manipuler le DOM en TypeScript avec assertions et types d'éléments HTML
  • Écrire du code réutilisable avec les génériques

Earn Your Certification

At the end of this course, you will receive a certification validating your skills in TypeScript if you successfully complete all quizzes.

TypeScript Course Certification
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Content up-to-date as of October 1, 2026
In French 🇫🇷
Shareable Certificate of Completion
Mentor Assistance
Source Code Provided

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TypeScript catches the bug before you do

A typo, a type that does not match… In JavaScript, the bug ships to production. In TypeScript, your editor underlines it in red, right away. Switch between the two modes.

script.tsInteractive
const user = {
firstName: "Marie",
age: 30,
};
 
console.log("Hello " + user.firstNam);
Problems

Property 'firstNam' does not exist on type. Did you mean 'firstName' ?

TypeScript spots the mistake in the editor, before the code even runs.

Same code, two fates. TypeScript turns production bugs into simple red underlines you fix while you type.

Autocomplete that reads your types

Because TypeScript knows the type of every variable, your editor suggests exactly what exists, and never what does not. Click a property to pick it.

user.tsInteractive
type User = {
name: string;
age: number;
email: string;
isActive: boolean;
};
 
const user: User = chargerUser();
 
user.

TypeScript knows the shape of the user object. It suggests its properties and their types, and saves you from typos.

No more memorizing or guessing: TypeScript guides you at every dot. That is the comfort you adopt in the course.

The standard of modern JavaScript

TypeScript is no longer optional: it has become the foundation of almost every professional JavaScript project. Master it, and you speak the industry's language.

TypeScript is everywhere

One typed language, all of serious JavaScript.

Large-scale web apps

Complex interfaces that stay maintainable over time.

APIs & back-end

The same typed language on the server, with Node.js.

Mobile apps

React Native in TypeScript, for iOS and Android.

Libraries & SDKs

Typed code other developers love to use.

Enterprise apps

Angular requires it: reliability at team scale.

Tools & CLIs

Robust, reliable command-line tools.

Games & canvas

Web games where every variable stays under control.

Dashboards & data

Dashboards where the data never lies.

Microsoft (which created it), Angular, Slack, Airbnb, Vercel, Stripe... TypeScript is the standard of professional JavaScript.

What TypeScript changes in your code

JavaScript lets you write anything, then makes you pay for it in production. TypeScript checks your code as you write it. Here is the difference.

Plain JavaScript
  • Bugs are discovered in production, reported by your users.
  • No reliable autocomplete: you guess names and types.
  • Refactoring is scary: you cannot tell what you will break.
  • The code explains nothing: every function is a black box.
With TypeScript
  • Errors are caught in the editor, before you even run the code.
  • Autocomplete and IntelliSense everywhere: you code faster and safer.
  • You refactor with confidence: TypeScript flags everything that must follow.
  • Types document your code on their own, for you and your team.
Bottom line

You go from code where you cross your fingers to code where the compiler protects you. You code faster, and you sleep better.

Learner Reviews of Our TypeScript Course

4.9 / 5
92 reviews (Trustpilot and Believemy)
Pour avoir fait beaucoup de formations en ligne, Believemy est au sommet ! Les cours sont en français, très bien expliqué, la pédagogie est vraiment top. De plus l'interface est intuitive et un petit QCM à chaque session souligne la qualité de l'apprentissage. J'ai pu réalisé un site de qualité grâce à Believemy et toutes les petites astuces que donne Louis Nicolas. C'est LA formation en ligne la plus aboutie.
Nicolas C.
Web developer verified by Trustpilot
Le cours est vraiment clair et compréhensible pour moi. Le formateur a une meilleure expérience pédagogique. Les explications ne sont pas ennuyantes.
Elisée K.
Web developer verified by Trustpilot
Google
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FAQs

What is TypeScript?

TypeScript is a programming language developed by Microsoft that builds upon JavaScript.
It offers all the features of JavaScript but includes static typing to detect errors during compilation. This enhances the readability and maintainability of your code, especially in complex projects, by allowing for explicit type definitions.

How long will it take to complete this course?

Our learners take an average of 15 hours to complete this course.

Are there specific times I need to follow the course?

No, you can follow the course at your own pace as it is entirely online. This means you can take this course whenever and wherever you like.

What level is required to take this course?

This course is suitable for all levels. If you've never used TypeScript before, just start from the beginning and follow the modules in order.
If you already have some knowledge of TypeScript, you can jump directly to the modules that interest you.

Can I ask questions if I have a problem?

Yes, you can ask questions anytime. We have a team of mentors available to help you and answer your questions if you encounter any issues.
You can even join our private community to interact with other learners.

Will I receive a certificate at the end of the course?

Yes, you will receive a certificate upon completing the course. This certificate is proof of your achievement, as you must complete all modules and quizzes to receive it, demonstrating your commitment.

Is the course up-to-date with the latest version?

Yes, the course is up-to-date with the latest version of TypeScript. We regularly update our courses to ensure they reflect the latest technology.

Why learn TypeScript when AI is on the rise?

Because AI writes code faster than you do, but it does not know what you want. It suggests, it gets things wrong, it produces a solution that half works. Without understanding what it wrote, you can neither fix it nor judge whether it was the right call.
That is exactly why we teach you to work WITH it. BeBot guides you through the exercises, and our Claude Code courses show you how to get ten times more out of it than a beginner who copies and pastes without reading.
The people doing well today are neither the ones refusing AI nor the ones handing everything over to it. They are the ones who can read what it writes, spot what is off, and take back control when it gets stuck.

Our articles on TypeScript

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