在模块内部使用模块进行类型声明无法编译（TS2503无法找到名称空间）

Question

I'm getting a compilation error when I try to do this in typescript (TS2503 cannot find namespace):

import mylib = require("./mylib");
let person: mylib.Person = new mylib.Person("A");

where I have a mylib directory with two files:

$ cat mylib/index.ts

import Person = require("./Person");
export = { Person: Person }

$ cat mylib/Person.ts

export = class Person{
    name: String;

    constructor(name) {
        this.name = name;
    }
}

The problem is with the type declaration let person: mylib.Person = new mylib.Person("A"); . If I replace it with let person = new mylib.Person("A"); , it does compile, but I want to declare the type explicitly. At the same time, I want to avoid importing mylib/Person . So I want to avoid this solution:

import Person = require("./mylib/Person");
let person: Person

I decided to put everything in mylib to have a single point of access and eliminate the need to import each individual submodule. What's an alternative way to solve the compilation error? Ideallly, I'd access Person through a previously imported mylib module.

Answer 1

That is a very interesting approach, but the problem is that you can't use types like that (as properties of an object).

Instead, you could do this:

import { Person } = require("./mylib");
let person: Person = new Person("A");

That way you are using object destructuring and, as you can see, is the usual way of importing classes in TypeScript.