- Quick node express server install#
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- Quick node express server code#
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Feel free to explore the TypeScript docs for more information. TypeScript and its compiler are highly configurable, and there is a lot more to learn about it. esModuleInterop flag enables default imports for TypeScript modules with export = syntax that you’ll need for importing from the Express library later on.īear in mind that this basic set of tsconfig.json options is just something to get you started.It doesn’t necessarily need to be the root of the project folder, like here. rootDir defines the root location of typescript files inside the project.But, if this was a client-side app that runs in, e.g., Internet Explorer browser, then you should aim for lower ECMAScript versions and have something like "target": "es5".
Quick node express server code#
Since the code can be run on your server, inside a Node environment, the ES6 JavaScript version is good to go. target property defines the targeted JavaScript version of the compiled code.The standard module system inside a Node environment would be CommonJS. module specifies a module system to be used in the compiled JavaScript code.Options set here define most of the TypeScript configuration. The crucial property of the configuration file is called compilerOptions. } Code language: JSON / JSON with Comments ( json ) Populate the file with the following JSON: Also, this file allows you to configure how the typescript library will compile the TypeScript code inside the project. The presence of a tsconfig.json file in a directory indicates that the directory is the root of a TypeScript project. Next, create a tsconfig.json file in the project’s root folder. For that reason, typescript is a development dependency.
Quick node express server install#
If someone were using your app as an npm package, he wouldn’t need to install the typescript dependency, as that person would only use the runtime version of the application/package. The TypeScript code needs to be transpiled to JavaScript before the package is used in runtime.
Note: Node environment (or browser environment in any client-side app) still only understands the JavaScript language. After the installation, you’ll find the devDependencies property inside the package.json populated with these packages. The -D, also known as -dev, means that both packages should be installed as development dependencies.
ts extension) from the command line within the Node environments. Ts-node is a useful package that enables running TypeScript files (ones having the. However, in TypeScript ecosystem(s), you’ll probably run into both terms. At the same time, transpiling is the term used for code transformation between high-level languages. The subtle difference from the term compiling exists, as compiling defines code transformation from a high-level programming language to a low-level one. It transforms the TypeScript code to JavaScript in a process called transcompiling or transpiling. Typescript package is the key library in all the applications using TypeScript inside the codebase.
Npm i -D typescript ts-node Code language: Matlab ( matlab ) You’ll start by creating a project directory and move to its root folder: Set Up Your TypeScript Development Environment
Quick node express server full#
If you want to follow along by inspecting the codebase while reading the next sections, the full code example is available on a splitio-examples GitHub repo. Basic familiarity with the command line.Wondering what the app’ll be about? Do the time zones of the world sound interesting enough? Let’s get started! Prerequisites for Node and TypeScriptįor the best experience inside this tutorial, you need to have: Testing the configured percentage split.Adding new feature using feature flag branching (branch by abstraction) with Split.Making the application code strongly typed with TypeScript.Creating an Express-driven Node.js application exposing a REST API.Let’s run quickly over the topics of this tutorial: But you can instantly stop worrying and learn to love JavaScript, well, actually – love TypeScript – JavaScript’s type-safe superset and an excellent tool for a better and safer development experience. One could argue that a downside of such a technical stack would be the lack of types – the fact that JavaScript isn’t a strongly typed language. It usually means using a Node.js environment and a server run by the Express library. A RESTful API in JavaScript can be built from scratch very quickly.