Khalil Stemmler | Advanced TypeScript & Node.js best practices for large-scale applications

My book on Node.js / TypeScript software design and architecture just pre-launched 📕 (%33 off)!

SOLID: The Software Design & Architecture Handbook

Presale $29.99

I'm Khalil. I teach advanced TypeScript & Node.js best practices for large-scale applications. Learn to write testable, flexible, and maintainable software.

I create courses, books, and articles for aspiring developers on Enterprise Node.js, Domain-Driven Design, GraphQL, and writing testable, flexible JavaScript.

Recent Articles

Object Stereotypes Object-Oriented Design

rdd

The six object stereotypes act as building blocks - stereotypical elements - of any design.

98% of Developers Use React as a Framework, Not a Library Frontend

react architecture object design frameworks

React is a view layer library but most developers use it as a framework. Let's look into why that is and the implications of it.

Non-Functional Requirements (with Examples)Object-Oriented Analysis

non-functional requirements software quality attributes

Non-functional requirements are quality attributes that describe how the system should be. They judge the system as a whole based ...

What are Dependencies, Composition, Delegation, and Aggregation in Object-Oriented Programming?Object-Oriented Programming

dependencies composition delegation aggregation

The four principles of object-oriented programming (abstraction, inheritance, encapsulation, and polymorphism) are features that -...

4 Principles of Object-Oriented Programming Object-Oriented Programming

abstraction encapsulation inheritance polymorphism oop

The four principles of object-oriented programming (abstraction, inheritance, encapsulation, and polymorphism) are features that -...

Is DDD Overrated? | Domain-Driven Design Domain-Driven Design

pragmaticism

DDD is one particular approach to software design. While highly influential and transformational for developers new to software de...

How to Test Code Coupled to APIs or Databases Test-Driven Development

typescript test-driven development bdd core code infrastructure code

In the real-world, there's more to test than pure functions and React components. We have entire bodies of code that rely on datab...

How to Mock without Providing an Implementation in TypeScript Test-Driven Development

typescript test-driven development mocking jest ts-auto-mock

Having to provide an implementation everytime you create a test double leads to brittle tests. In this post, we learn how to creat...

Enforcing Coding Conventions with Husky Pre-commit Hooks Tooling

guides typescript prettier formatting

In this guide, we'll learn how to setup Husky to prevent bad git commits and enforce code standards in your project.

Domain-Driven GraphQL Schema Design using Event Storming GraphQL

domain-driven design professionalism project planning

A GraphQL schema is a declarative, self-documenting, organization-wide API. It's pretty important to spend a little bit of time on...

How Apollo REST Data Source Deduplicates and Caches API calls [Deep Dive]GraphQL

apollo server graphql

Apollo's REST Data Source does a lot more than you'd think behind the scenes, and that's why it's recommended instead of using a w...

How to Setup a TypeScript + Node.js Project TypeScript

guides typescript starters

In this guide, we walk through the process of creating a TypeScript project from scratch with cold-reloading, and scripts for buil...

Where Do Domain Events Get Created? | Domain Driven Design w/ TypeScript Domain-Driven Design

ddd domain entities software design domain events

In this post, I explain how good ol' fashioned encapsulation + TypeScript getters and setters enable us to effectively create Doma...

My book on Node.js / TypeScript software design and architecture just pre-launched 📕 (%33 off)!

SOLID: The Software Design & Architecture Handbook

Presale $29.99

Recent Blogs

98% of Developers Use React as a Framework, Not a Library

Last updated Sep 4th, 2022

What’s the difference between a framework and a library? A framework is something that you plug your code into. A library is something that…

How to Setup a TypeScript + Node.js Project

Last updated Aug 29th, 2019

We talk about a lot of advanced Node.js and TypeScript concepts on this blog, particularly Domain-Driven Design and large-scale enterprise…

What Is Hashing?

Last updated May 10th, 2022

Hashing is a technique used to convert a key into another value (typically for cryptographic or data storage purposes). It works by running…

JavaScript forEach | Looping Through an Array in JS

Last updated May 3rd, 2022

For many developers, JavaScript acts as introduction to the functional programming paradigm. And if you've never encountered callback…

Recently Edited Wikis

Collaboration

Last updated Aug 4th, 2022

responsibility-driven design

An interaction between objects or roles (or both)

Responsibility

Last updated Aug 4th, 2022

responsibility-driven design

An obligation to perform a task (doing) or know information (knowing)