WTF Typescript

🔗 Sponsored by Sentry | Code breaks, fix it faster 📌 Chapters: 00:00:00 - Intro 00:00:42 - Who’s actually a “web developer”? 00:02:31 - Trash’s live intro & TypeScript presentation setup 00:03:59 - Sentry #ad 00:04:38 - Excess property checks in TS 00:09:42 - WTF: Object spreads silence type errors 00:14:30 - React prop spreading madness 00:18:22 - Structural vs duck typing debate 00:24:00 - WTF: Enums and why everyone hates them 00:27:45 - Enum strings vs numbers behavior 00:33:10 - Why enums in Node are cursed 00:36:55 - Safer enum alternatives using const objects 00:43:10 - TS quirks: Boolean filter keeps undefined in types 00:46:40 - TSReset: The “CSS reset” for TypeScript 00:49:01 - WTF: Empty object {} lets everything through 00:52:32 - Doom rendered in TypeScript type system 00:54:00 - Type-level math in TS (it’s real) 00:56:33 - Scaling hell: TS performance bottlenecks 01:00:01 - Flamegraphs and fighting TS perf without docs 01:04:55 - TS inference vs explicit typing in large codebases 01:09:30 - Prime’s favorite TS bug strikes again 01:14:01 - Casey breaks down the compiler logic 01:17:50 - Is this a TypeScript bug or a feature? 01:22:44 - Final thoughts and community love --- **Topics Covered:** • TypeScript excess property checks • Enums vs object literals • Structural vs duck typing • TS compiler edge cases • WTFs that break your mental model • Type-level math • Performance debugging hell • Massive monorepo pain points • The one TypeScript bug Prime can’t let go