如何组合flowjs类型定义

Question

如何结合下面的类型定义，就不用自己重复了？

type Lama = {|
name: string,
|};

type LamaWithHat = {|
name: string,
hat: string,
|};

尝试使用Interseptions，但显然语法可能是错误的：

type LamaWithHat = {|
hat: string,
|} & Lama;

Answer 1

如果我们这样做呢 /* @flow */

type Lama = {|
name: string,
|};

type LamaWithHat = {|
...Lama,
hat: string,
|};

const a: Lama = {
    name: 'rahul'
}

const b: LamaWithHat = {
    name: 'rahul',
    hat: 'circluar'
}

在这里测试这段代码 https://flow.org/try/#0PQKgBAAgZgNg9gdzCYAoVAXAngBwKZgAyAhgLbFgC8YA3gD6oB2ZeAXGAM4YBOAlowHMANKjoBfANzps+ImWIB1XhgAWACWIYqtBgDp9JciJWb2XPoJHipqAMZxGXMMXaGK1GqjDewzUmzAAcm5iFQBXGEDUMXR7Ry0AI1d5JVUNLQ8vHz8A4NCIwJEfMBMMdkDbXm5bGDDibiixIA