ts怎么将接口的部分属性改成必选, 其余保持不变

Question

interface Student {
name?: string;
age?: number;
class: number
}
比如要将这个接口的age改成必选, 其余保持不变, 该怎么做呢

Answer 1

interface Student {
  name?: string;
  age?: number;
  class: number
}

type CustomRequired<T, K extends keyof T> = {
  [P in K]-?: T[P];
} & Omit<T, K>

// age变required, 其余不变
type Student2 = CustomRequired<Student, 'age'>
// age, name 变required, 其余不变
type Student3 = CustomRequired<Student, 'age' | 'name'>

Answer 2

type X = Omit<Student, "age"> & {
    age: number
};

传送门：Code in TypeScript Playground

Answer 3

interface Student {
  name?: string;
  age: number;
  class: number
}