typescript 打字稿和运算符
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Typescript & operator
提问by ppoliani
I'm struggling to find the definition of the &operator in TypeScript. I have recently come across the following code:
我正在努力&在 TypeScript 中找到运算符的定义。我最近遇到了以下代码：
type IRecord<T> = T & TypedMap<T>;
What does that operator do, and how is it different from the union type |?
该运算符有什么作用，它与联合类型|有何不同？
回答by Sampson
This looks like it's from the Intersection Typesportion of the Language Specification. Specifically, the &appears to be an intersection type literal. As for what it does:
这看起来像是来自语言规范的交集类型部分。具体来说，&似乎是一个交集类型文字。至于它的作用：
Intersection types represent values that simultaneously have multiple types. A value of an intersection type A & B is a value that is both of type A and type B. Intersection types are written using intersection type literals (section 3.8.7).
交集类型表示同时具有多种类型的值。交集类型 A & B 的值是同时属于类型 A 和类型 B 的值。交集类型是使用交集类型文字编写的（第 3.8.7 节）。
The spec goes on to offer a helpful snippet to better understand the behavior:
规范继续提供一个有用的片段来更好地理解行为：
interface A { a: number }
interface B { b: number }
var ab: A & B = { a: 1, b: 1 };
var a: A = ab; // A & B assignable to A
var b: B = ab; // A & B assignable to B
Because abis both of type Aandof type B, we can assign it to aand/or b. If abwere only of type B, we could only assign it to b.
因为ab是 typeA和type B，我们可以将它分配给aand/or b。如果ab只是类型B，我们只能将它分配给b.
The code you shared may be from this comment on GitHub, which mentions Intersection Types.
您分享的代码可能来自GitHub 上的这个评论，其中提到了 Intersection Types。
