ts：交集类型 交叉类型

除联合类型的交集是取共同的部分外，其他类型的交集是取所有

  type TypeA = { a: string; b: number; };  
  type TypeB = { b: number; c: boolean; };  
  type IntersectionType = TypeA & TypeB; // { a: string; b: number; c: boolean; }
  
  type test2 = ('1' | '2') & ('1' | '3')

如果编辑器没有简化交叉类型可以自己处理下

interface User {
    name: string
    age: number
    address: string
  }
  
  type UserPartialName = PartialByKeys<User, 'name'>
  type PartialByKeys<T, K> = {
    [P in keyof T as P extends K ? P : never]?: T[P]
  } & {
    [P in Exclude<keyof T, K>]: T[P]
  }
	此时UserPartialName 显示
	// type UserPartialName = {
	//   name?: string | undefined;
	// } & {
	//   age: number;
	//   address: string;
	// } 

可以人为处理下

type IntersectionToObj<T> = {
    [K in keyof T]: T[K]
  }
  type PartialByKeys<T , K = any> = IntersectionToObj<{
    [P in keyof T as P extends K ? P : never]?: T[P]
  } & {
    [P in Exclude<keyof T, K>]: T[P]
  }>