打字稿:限制对象值的类型 [英] Typescript: limiting types in object values

问题描述

我正在尝试创建一个大对象，其值仅限于 3 种类型:Texture、Geometry、Script

我的对象看起来像这样:

var 资产:资产 = {天空:<纹理>，地面:<纹理>，城市:<几何>，人们:<脚本>，汽车:<脚本>，太阳:<圆圈>//<--这应该失败，因为它不是 3 种类型之一//...}

如何声明 Assets 接口，使每个键值对中的值仅限于这 3 种类型?我尝试从以下开始:

界面资产{关键:质地 |几何 |脚本;}

但是当我分配时它会中断

this.assets = {sky: new Texture()}

因为它只需要 key 而不是 sky.有没有办法在对象中不嵌套对象的情况下实现这一点?

解决方案

怎么样:

type Assets = {[key: string]: 纹理 |几何 |脚本;}

该类型将允许您请求的类型之一的字符串键和值.

有关该主题的更多信息:可索引类型

I'm trying to create a large object whose values are limited to only 3 types: Texture, Geometry, Script

My object would look something like this:

var assets: Assets = {
    sky: <Texture>,
    ground: <Texture>,
    city: <Geometry>,
    people: <Script>,
    cars: <Script>,
    sun: <Circle> // <--This should fail because it's not one of the 3 types
    //...
}

How can I declare the Assets interface so the value in each key-value pair is limited to these 3 types? I tried starting with:

interface Assets{
    key: Texture | Geometry | Script;
}

but then it breaks when I assign

this.assets = {sky: new Texture()}

Because it's expecting only key instead of sky. Is there any way of achieving this without nesting objects within objects?

解决方案

How about:

type Assets = {
    [key: string]: Texture | Geometry | Script;
}

That type will allow for string keys and values of one of the types you requested.

More on the subject: Indexable Types

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