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Improve TypeScript example for conditional Omit usage #130

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Improve TypeScript example for conditional Omit usage #130

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10 changes: 7 additions & 3 deletions docs/typescript.md
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Original file line number Diff line number Diff line change
Expand Up @@ -928,10 +928,14 @@ interface CartItem {
color?: string; // Optional color

// Omit color if quantity is 1
const singleItemPayload = Omit<CartItem, "color" extends string ? "color" : never>;
type SingleItemPayload<T extends CartItem> = T extends { quantity: 1 }
? Omit<T, 'color'>
: T

// Omit color for all items if quantity is always 1
const cartPayload: singleItemPayload[] = [];
// Omit color for all items when quantity is 1
const cartPayload: SingleItemPayload<CartItem & { quantity: 1 }>[] = [
{ productId: 123, quantity: 1 },
];
```

## Interfaces
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