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Forgetting to narrow union types leads to type errors
5/10 MediumDevelopers frequently forget to implement type guards or narrowing for union types, resulting in runtime errors when accessing type-specific properties or methods. This requires checking the actual type before using type-specific operations.
Collection History
Query: “What are the most common pain points with TypeScript in 2025?”3/27/2026
Not narrowing types leads to errors. type Result = string | number; function handle(result: Result) { console.log(result.toFixed(2)); // ❌ Error }
Created: 3/27/2026Updated: 3/27/2026