Duncan Leung

👋 Hi, I'm Duncan Leung

I'm a front end web engineer and former product manager. I write about JavaScript, React, and web development.

I'm a self taught software developer 👨🏻‍💻, and this is a place for me to 📝 learn in public.

Latest ArticlesView all

Securing AWS API Gateway Endpoints (Cognito, IAM, API Keys)

Set Breakpoints to Locally Debug AWS Lambda

Reference AWS Lambda API Endpoints in serverless.yml

Add Custom AWS YAML Tags in VS Code

Switching AWS Profiles for Serverless CLI

How to Teach Programming (and other things)

Select Gatsby Contentful Locale Data in GraphQL

Using TypeScript Type Guards

Array .map() over TypeScript Array Union Types

Load Python Environment Variables

Testing Document Head Meta Tags

Conditional Types to Infer Props from Emotion `as` Prop

Why typescript-eslint Performance is Slow

How to Setup ESLint .eslintrc Config

Profile and Remove Slow ESLint Rules

Most PopularView all

TypeScript Module Declaration for SVG Assets

Import SVG Components in Storybook

Testing ValidationSchema Formik Forms

Setting Up Python: pyenv, pyenv-virtualenv, poetry

Testing Formik 'onSubmit' with Jest

Fixing React Warning: Synthetic Events in setState()

Avoiding React setState() Pitfalls