Type alias TypePropertyNames<T, KT>

TypePropertyNames<T, KT>: { [ K in keyof T]: T[K] extends KT ? K : never }[keyof T]

选取T类型中值为KT类型的所有键

    class A
    {
        a = 1;
        f(){}
    }

    var a: TypePropertyNames<A, number>; //var a: "a"
    var a1: TypePropertyNames<A, Function>; //var a1: "f"

Type Parameters

T
KT

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