TypeScript is a language that enables writing better code for large and complex projects. Explore What TypeScript is and its types through this blog.
The presence of atsconfig.jsonfile in a directory indicates that the directory is the root of a TypeScript project. Thetsconfig.jsonfile specifies the root files and the compiler options required to compile the project. JavaScript projects can use ajsconfig.jsonfile instead, which acts almost th...
Enums areused when we know all possible values at compile time, such as choices on a menu, rounding modes, command line flags, etc. It is not necessary that the set of constants in an enum type stay fixed for all time. In Java (from 1.5), enums are represented using enum data type...
The npm registry is still the most popular way of publishing packages. Even though Node.js supports app packages being written in TypeScript, library packages must be deployed as JavaScript code – so that they can be consumed by either JavaScript or TypeScript. Therefore, a single library file...
TypeScript allows merging multiple types suchas interfaces,enums,namespaces, etc. One notable case where we cannot merge isclasses. For that, we will need to use something calledMixins(Which will be covered in a future article here onUpmostly). ...
Let’s explore some practical examples of when to useMapandRecordin TypeScript. 3.1. UseRecordfor Structured Data Recordis particularly useful when we want to define a specific structure for an object with string keys and a consistent value type, and it doesn’t require the dynamic behavior of...
JSX.IntrinsicElementsis a type in TypeScript's global scope that defines which native JSX elements are in scope, and what props they require. # Usage // @errors: 2741declareglobal{namespaceJSX{interfaceIntrinsicElements{"my-custom-element": {id:string;};}}}<my-custom-element/>; ...
JavaScript has one type with a finite amount of values: boolean, which has the valuestrueandfalseand no other values. With enums, TypeScript lets you define similar types statically yourself. Numeric enums# This is a simple example of an enum: ...
enum Color { Red, Green, Blue } enum Color { Yellow = 3 } const color: Color = Color.Yellow; // valid The distinction between type space and value space is important because it allows TypeScript to use types to validate the correctness of your code, and to catch type mismatches befor...
In this enum Red is assigned the value of 0, Green is 1, and Blue is 2. Enums are zero-indexed just like arrays in JavaScript. Object classes Object classes, interfaces, and inheritance are all supported in TypeScript. JavaScript does not have a true class system for object-oriented prog...