Articles

TypeScript articles from fettblog.eu — real-world TypeScript patterns, tips, and deep dives that complement the book.

2025

1. Feb 3, 2025 TypeScript's erasableSyntaxOnly Flag

2024

1. Mar 5, 2024 The never type and error handling in TypeScript

2023

1. Jul 17, 2023 5 Inconvenient Truths about TypeScript
2. Nov 7, 2022 Announcing the TypeScript Cookbook

2022

1. May 11, 2022 TypeScript: Iterating over objects
2. Jan 10, 2022 How not to learn TypeScript

2021

1. Nov 30, 2021 TypeScript: The humble function overload
2. Sep 15, 2021 TypeScript + React: Children types are broken
3. Sep 14, 2021 TypeScript: In defense of any
4. Jul 21, 2021 TypeScript: Unexpected intersections
5. Jul 6, 2021 TypeScript: Array.includes on narrow types
6. Apr 13, 2021 TypeScript + React: Typing Generic forwardRefs
7. Mar 2, 2021 TypeScript: Narrow types in catch clauses
8. Jan 20, 2021 TypeScript: Low maintenance types
9. Jan 7, 2021 Tidy TypeScript: Name your generics

2020

1. Nov 24, 2020 Tidy TypeScript: Avoid traditional OOP patterns
2. Nov 20, 2020 Tidy TypeScript: Prefer type aliases over interfaces
3. Nov 19, 2020 Tidy TypeScript: Prefer union types over enums
4. Aug 19, 2020 this in JavaScript and TypeScript
5. Aug 14, 2020 TypeScript and ECMAScript Modules
6. Jul 30, 2020 TypeScript + React: Why I don't use React.FC
7. Jul 28, 2020 TypeScript + React: Component patterns
8. Jul 17, 2020 TypeScript: Augmenting global and lib.dom.d.ts
9. Jul 6, 2020 Vite with Preact and TypeScript
10. Jun 29, 2020 TypeScript: Union to intersection type
11. Jun 19, 2020 TypeScript: Variadic Tuple Types Preview
12. Jun 17, 2020 TypeScript: Improving Object.keys
13. Mar 25, 2020 TypeScript + React: Typing custom hooks with tuple types
14. Feb 6, 2020 TypeScript: Assertion signatures and Object.defineProperty
15. Feb 3, 2020 TypeScript: Check for object properties and narrow down type

2019

1. Sep 10, 2019 boolean in JavaScript and TypeScript
2. Sep 6, 2019 void in JavaScript and TypeScript
3. Sep 4, 2019 Symbols in JavaScript and TypeScript
4. Aug 28, 2019 Why I use TypeScript
5. Aug 27, 2019 TypeScript + React: Extending JSX Elements
6. Aug 26, 2019 TypeScript: Validate mapped types and const context
7. Aug 19, 2019 TypeScript: Match the exact object shape
8. Aug 15, 2019 TypeScript: The constructor interface pattern
9. Jul 16, 2019 TypeScript without TypeScript — JSDoc superpowers
10. Jul 15, 2019 TypeScript: Mapped types for type maps
11. Feb 13, 2019 TypeScript: Ambient modules for Webpack loaders

2018

1. Dec 12, 2018 TypeScript: Built-in generic types
2. Nov 29, 2018 TypeScript: Type predicates
3. Mar 16, 2018 TypeScript and Substitutability
4. Mar 14, 2018 Debugging Node.js apps in TypeScript with Visual Studio Code