Young-zhiqiang
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Young-zhiqiang
type Head = T extends [infer H, ...infer B] ? H : never type H0 = Head // never type H1 = Head // 1 type H2 = Head //...
type Person = { id: string; name: string; age: number; from?: string; speak?: string; }; type OptionalKeys = { [K in keyof T]: undefined extends T[K] ? K : never;...