属性签名

  1. interface Foo {
  2.   x: number
  3. }
  4. interface Bar {
  5.   y: number
  6. }
  8. /* 
  9.   {
  10.     x: number,
  11.     y: number
  12.   }
  13. */
  15. type T = Foo & Bar
  17. const obj: T = {
  18.   x: 1,
  19.   y: 2
  20. }

索引签名

  1. interface Foo {
  2.   [prop: string]: number
  3. }
  4. interface Bar {
  5.   [prop: number]: number
  6. }
  8. type T = Foo & Bar
  10. /* 
  11.   {
  12.     [prop: string]: number,
  13.     [prop: number]: number
  14.   }
  16. */
  18. const obj: T = {
  19.   x: 1,
  20.   y: 2
  21. }

调用签名与构造签名

  1. interface Foo {
  2.   (name: string): string
  3. }
  5. interface Baz {
  6.   (name: string): number
  7. }
  9. /* 
  10.   {
  11.     (name: string): string,
  12.     (name: string): number
  13.   }
  14. */
  16. type T = Foo & Baz

交叉类型联合类型

  • & 比 | 有更高的优先级
    1. type Foo = number & string | boolean & number
    2. // 等同于 (number & string) | (boolean & number)