Enums in TypeScript are a feature that is not only a type-level extension to JavaScript. They also carry a named set of constants. TypeScript supports numeric enums and string enums. Both use string values for their identifiers. This tutorial shows you how to retrieve all available keys of a TypeScript …

Node.js has the built-in crypto module that allows you to calculate hashes. To calculate a hash, Node.js uses a bundled version of OpenSSL for cryptographic functions. You don’t have to interact with these cryptographic functions directly. The node:crypto module wraps OpenSSL’s features with a clean …

JavaScript arrays come with dozens of helpful methods. Chaining methods is also possible because some of the methods return an array instance, too. That means you can create your array pipelines and adjust the values to your needs by filtering, mapping, sorting, and so on. But some of the array …

We migrated the code running the superchargejs.com website from CommonJS to ESM. The CommonJS project used ts-node in combination with SWC to run the code. But ts-node isn’t working with TypeScript and ESM (there’s an open issue). We can’t use ts-node because of the mentioned issue …

We migrated the code running the superchargejs.com website from CommonJS to ESM. We used ts-node in combination with SWC to run the CommonJS TypeScript code. But ts-node isn’t working with TypeScript and ESM (there’s an open issue). Now that ts-node isn’t working, we need to use …

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 …