typescript-ops
TypeScript Operations
Comprehensive TypeScript skill covering the type system, generics, and production patterns.
Type Narrowing Decision Tree
How to narrow a type?
│
├─ Primitive type check
│ └─ typeof: typeof x === "string"
│
├─ Instance check
│ └─ instanceof: x instanceof Date
│
├─ Property existence
│ └─ in: "email" in user
│
├─ Discriminated union
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