50 TypeScript F*ck Ups (I’ve Made So You Don’t Have To)

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A comprehensive guide covering 50 common TypeScript mistakes and anti-patterns, from basic misuses like relying on 'any' and ignoring strict mode, to advanced pitfalls with generics, async operations, and type system features. Each mistake includes practical examples and actionable solutions, emphasizing proper use of type guards, utility types, discriminated unions, and runtime validation. The guide stresses that TypeScript is a modeling tool requiring deliberate type design, not just a stricter linter.

#javascript

#typescript

Oct 29, 2025•9m read time•From javascript.plainenglish.io

Table of contents

1. Using any because “it’s faster”2. Ignoring compiler warnings 3. Not enabling strict mode 4. Confusing undefined and null 5. Overusing ! (non-null assertion)6. Forgetting nullish coalescing ( ?? )7. Using var in 2025 8. Blind type assertions ( as )9. Forgetting about never 10. Using object instead of proper types