Code Quality
TypeScript `any` Type Abuse: Why It Undermines Type Safety
Code with excessive any usage has all the runtime crash risk of JavaScript with all the verbosity of TypeScript — the worst of both worlds.
❌ Overuse of any
function parseApiResponse(data: any): any {
const user: any = data.user;
const items: any[] = data.items;
return {
name: user.nme, // Typo undetected!
total: items.reduce((acc: any, item: any) => acc + item.pric, 0)
};
}✅ Properly Typed Response
interface ApiUser { name: string; }
interface ApiItem { price: number; }
interface ApiResponse { user: ApiUser; items: ApiItem[]; }
function parseApiResponse(data: ApiResponse) {
return {
name: data.user.name,
total: data.items.reduce((acc, item) => acc + item.price, 0)
};
}💡
Pro tip: Use unknown instead of any for external data. unknown requires a type assertion or guard before use, forcing you to validate the shape.
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