We’re using UVU as the test runner for packages and applications. UVU works nicely in CommonJS projects using plain JavaScript and also with TypeScript using a require hook. We used the ts-node/register hook with UVU, but that one doesn't work anymore when migrating your code from CommonJS to …

TypeScript comes with a feature called declaration merging. Declaration merging means that the TypeScript compiler merges two or more separate declarations that use the same name into a single definition. Merging definitions is helpful if you’re extending a contract with custom functionality and want to tell TypeScript about the …

Using TypeScript comes with the benefit of having your IDE or editor type-check everything in your project. Another benefit is that you get IntelliSense in all places where it’s possible. But you don’t get IntelliSense when working with Node.js request headers. We can change that by creating …

GitHub Actions allow you to test Node.js projects. You can define a specific Node.js version you want to run your tests against. You may also provide a list of Node.js versions allowing you to run your tests against them. This tutorial shows you how to run your …

Promises are a construct in programming languages for asynchronous operations. A promise acts as a proxy for a result that is initially unknown because the computation is not yet complete. The JavaScript ecosystem had promise implementations before it became part of the language itself. For example, when and Bluebird are …

Node.js includes the needed functionality to interact with files on your local hard disk. Typically, you’re referencing files on disk using a file path. This path can have different formats, like a relative or an absolute path or a file URL. With the transition to ECMAScript modules developers …

Node.js provides all the functionality you need to interact with the local file system. The integrated fs core module has everything needed. It also allows you to detect the file type. If you need to detect whether a given path points to a named pipe (known as FIFO) on …

Interacting with files on your local hard disk is a common task in application development. Node.js comes with the necessary tooling to do so. The Node.js fs core module provides lots of functions to read, write, delete, and interact with files and directories. This tutorial shows you how …