Typescript "new(...args: any[]) => T" 与“{ new(...args: any[]): T }”

Question

new(...args: any[]) => T 和 { new(...args: any[]): T } 有什么区别，我应该使用哪一个？

Answer 1

它们是别名，它们都不支持静态文件：

class X {
    static staticAttr = 42;
    static method() { }
    attr: string;
}

interface A {
    Attr1: { new (...args): X }
    Attr2: new(...args: any[]) => X
}

let fn = (arg: A) => {
    arg.Attr1.staticAttr // Property 'staticAttr' does not exist on type 'new (...args: any[]) => X'
    (new arg.Attr1()).attr;
    (new arg.Attr2()).attr;
}

{ new(...args: any[]): T被TS映射成new(...args: any[]) => T。所以我认为 new(...args: any[]) => T 会更好，但没有太大区别

Playground

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