typescript - 打字稿“新（...args：任何[]）=> T”与“{新（...args：任何[]）：T}”

Question

new(...args: any[]) => T我应该使用哪个和哪个有什么区别{ new(...args: any[]): T }？

标签： typescripttypesdeclaration

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由 TS 映射到new(...args: any[]) => T. 所以我认为new(...args: any[]) => T会更好，但差别不大

操场