Authentication is an important topic of any application. It's the gatekeeper that ensures only the right people can access the right resources. But how do you roll your own authentication in JavaScript & TypeScript? In this tutorial, we'll explore how to build a session-based authentication system. The motivation behind this tutorial is the…
tRPC allows developers to create fully type safe APIs with TypeScript in full-stack applications. While the server application produces a type safe router with type safe functions (e.g. CRUD operations: create user, get user by identifier, get all users), the client application can call these functions directly on the inferred type safe router…
When using function components in React, we may want to type their props with TypeScript. Overall there are two ways of making a React component type safe with TypeScript, however, let's start by converting the following JavaScript React component to a TypeScript React component as leading example: The straightforward yet most verbose way of…
TypeScript is getting more popular these days for frontend and backend applications. Here you will learn how to set up TypeScript in Node.js for a backend project. The previous tutorial already demonstrated how to set up a JavaScript project with Node.js. With this as foundation, we will start migrating the project to TypeScript here. First…
Type Guards in TypeScript are needed whenever you want to allow only a certain type for a routine in TypeScript. In this TypeScript tutorial, you will learn how to check for user defined types by using so-called user-defined type guards . We will start with two types and two objects annotated respectively with these types: In this TypeScript…
Generics in TypeScript are not easy to understand when just starting out with TS. Personally I had my struggles with them in the beginning, however, once you get how they are used, they make you a more complete TypeScript developer. In this TypeScript tutorial, you will learn how to use generics in TypeScript . We will start with defining a…
When using React's useState Hook in TypeScript, the method usually infers the implicit type for the returned state from the provided argument automatically. In the following example, React's useState Hook in a function component knows that it deals with a number type. Hence the returned state (here: count ) has the type number in addition to…
A brief summary of how to use React's useRef Hook for using a ref with TypeScript. First, a ref in React is mainly used to assign a HTML element to it. The assigned HTML element gives us imperative read and write operations on it which allows us to programmatically call functions. Take the following example for focusing an input element: When using…
This is a comprehensive tutorial on Monorepos in JavaScript/TypeScript --- which is using state of the art tools for these kind of architectures in frontend applications. You will learn about the following topics from this tutorial: What is a monorepo? How to structure a monorepo architecture? How to create a monorepo? Which tools to use for a…
Here you will learn how to use TypeScript with Babel Module Resolver for aliases that are defined in your .babelrc file: In order to get the same alias mappings to TypeScript, the tsconfig.json file needs to look like this: Now you can use import statemes with aliases in your TypeScript files too.
