打字稿“ new（... args：any []）=> T” vs“ {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，并且它们都不支持静态字段：

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;
}

TS将

{ new(...args: any[]): T映射到new(...args: any[]) => T中。所以我认为new(...args: any[]) => T会更好，但没什么大不同

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