比如 type a = b | c这些都是 interface 做不到的，因为 interface 是基于面向对象那套理论的概念...
下图中,interface可以被扩展,而type不能,只能使用联合体创建一个新的type。 但紧接着文档中又说道,在某些场合比如联合类型或者元组类型,可能还是需要使用type On the other hand, if you can’t express some shape with an interface and you need to use a union or tuple type, type aliases are usually t...
StackOverflow 上的讨论链接 Interface vs Type alias in TypeScript 2.7 Differences Between Type Aliases and Interfaces Types vs. interfaces in TypeScript interface X { a: number b: string } type X = {…
TypeScript will automatically merge both interfaces declarations into one, so when we use this Song interface, we’ll have both properties. 而type alias 不支持,会遇到编译错误: Extends and implements In TypeScript, we can easily extend and implement interfaces. This is not possible with types tho...
One difference is, that interfaces create a new name that is used everywhere. Type aliases don’t create a new name — for instance, error messages won’t use the alias name. 不完全正确。直接通过 type 定义的初始类型,是会创建相应的类型名称的。
[TypeScript] Interface Aninterfaceis a way of defining anobject type. An “object type” can be thought of as, “an instance of a class could conceivably look like this”. For example,string | numberis not an object type, because it makes use of theunion type operator....
interfaceUserDefaults{// The absence of a value represents 'system'colorThemeOverride?:"dark"|"light"; } 如果不启用此规则,即 exactOptionalPropertyTypes: false 情况下,colorThemeOverride 则可以设置三个值:“dark”、“light”、“undefined”。
Use TypeScript to develop React Applications — egghead.io Practical Advanced TypeScript — egghead.io Ultimate React Component Patterns with Typescript 2.8 — medium 参考 关于interface 和 type 二者的区别,handbook 的描述过时了,可参照https://medium.com/@martin_hotell/interface-vs-type-alias-in-type...
Example interface Rectangle { height: number, width: number } interface ColoredRectangle extends Rectangle { color: string } const coloredRectangle: ColoredRectangle = { height: 20, width: 10, color: "red" }; Try it Yourself » TypeScript Exercises Test Yourself With Exercises Exercise: ...
interface VS type 相同点 都可以描述一个对象或者函数 interface type 都允许拓展(extends) interface extends interface type 与 type 相交 interface extends type type 与 interface 相交 不同点 type 可以而 interface 不行 interface 可以而 type 不行 总结 interfa