Found 128 Articles for TypeScript

TypeScript is an open-source language that provides optional static typing for JavaScript. It allows developers to write more maintainable code by catching type-related errors at compile-time rather than runtime. However, working with event listeners in TypeScript can be a bit tricky. One common issue is the "property not existing on EventTarget" error. This error occurs when you try to access a property on an event target that TypeScript doesn't recognise. In this article, we will discuss how to fix this error and provide examples to demonstrate how to use event listeners in TypeScript. Understanding the Error Before we dive into ... Read More

TypeScript is an open-source programming language that provides type annotations to JavaScript. TypeScript has generic types that enable developers to write code that can work with different data types. Generics provide flexibility and reusability in code. However, in some cases, it is necessary to add constraints to generic types to restrict the types that can be used with them. In this article, we will explain how to add constraints to generic types in TypeScript and we will also discuss some examples. What are Generic Types? Before we dive into constraints, let's first understand what generic types are. Generic types in ... Read More

TypeScript is a superset of JavaScript that provides static typing capabilities, allowing developers to write more reliable and efficient code. One of the most powerful features of TypeScript is its support for reflection. Reflection enables TypeScript developers to inspect and manipulate the properties of classes at runtime, making it easier to write more flexible and dynamic code. In this article, we will explore how to use TypeScript reflection to get class properties and values. We will discuss what reflection is and how it works in TypeScript, provide a brief overview of TypeScript decorators, and then walk through three examples of ... Read More

TypeScript is a popular programming language that offers features such as type checking and type annotations to help developers write more robust and maintainable code. However, when TypeScript code is compiled into JavaScript, the type information is lost in a process called type erasure. This can lead to errors at runtime that are difficult to diagnose and fix. In this article, we will explore the concept of type erasure in TypeScript and how it can affect error behaviour in our code. Type Erasure Type erasure is the process of removing type information from a program during compilation. In TypeScript, this ... Read More

TypeScript is a statically typed programming language that is a superset of JavaScript. It is used for large-scale web applications that require strict typing, object-oriented programming concepts, and code reusability. One of the most important features of TypeScript is the ability to infer types automatically. This feature is known as implicit typing. Implicit typing is a feature that allows TypeScript to automatically determine the type of a variable at the time of its initialisation. This makes coding faster, easier, and less error-prone. This article will explore the concept of implicit typing in TypeScript and discuss its benefits with examples. What ... Read More

TypeScript is an open-source programming language developed and maintained by Microsoft. It is a superset of JavaScript, which means that all valid JavaScript code is also valid TypeScript code. TypeScript adds optional static typing, classes, interfaces, and other features to JavaScript to improve code quality, maintainability, and scalability. In this article, we'll explore how TypeScript is an optionally statically typed language, what that means for developers, and how it can benefit them in their projects. What is Optional Static Typing? Static typing is a programming language feature that allows developers to define data types for variables, function parameters, and function ... Read More

TypeScript, a superset of JavaScript, offers static typing capabilities that enhance code quality and catch errors during compilation. To fully leverage TypeScript's static typing features, it's crucial to have type definition files (.d.ts) for external JavaScript libraries and modules used in projects. These type definition files describe the types and interfaces exposed by the external entities, enabling the TypeScript compiler to understand their shape and behaviour. In this article, we'll explore the step-by-step process of creating custom TypeScript type definition files, empowering developers to benefit from static typing in their projects. Prerequisites Type definition files (.d.ts) serve as an interface ... Read More

TypeScript, an extension of JavaScript, introduces modules as a means to structure and organize code effectively. Modules play a vital role in developing scalable and maintainable applications by enabling code encapsulation and reusability. TypeScript supports two types of modules: internal (namespaces) and external (ES modules). In this article, we will delve into the differences between internal and external modules in TypeScript, exploring their characteristics and impact on code organization and sharing within a project. Internal Modules Internal modules, also known as namespaces, serve as logical containers within a single file to group related code elements together. They offer benefits such ... Read More

TypeScript is a superset of JavaScript that adds optional static typing to the language. This means that TypeScript allows developers to specify the types of variables, function parameters, and function return values. This feature helps to catch errors early in the development process and makes the code more robust. In TypeScript, type annotations are used to specify the types of variables, function parameters, and function return values. In this tutorial, we will explore different scenarios where type annotations are used in TypeScript and how they can help developers write better code. Declaring Variables With Type Annotations Syntax The syntax to ... Read More

TypeScript is a popular programming language widely used for developing large-scale applications. It is a superset of JavaScript and adds optional static typing, interfaces, and generics to the language. When working with TypeScript, it is crucial to have a smooth development workflow that includes automatically compiling .ts files with real-time changes. In this article, we will explore the different tools and techniques that can be used to achieve this. Why Automatically Compile TypeScript Files? When working on a TypeScript project, developers often make changes to the .ts files. After making changes, they must compile these files to get the corresponding ... Read More