Node.js 未定义导入的模块

学习nodejs+typescript，遇到这种情况：

情况：

folder1/file1.ts

    export module ModuleFactory{
         export function do(){
              return new SomeClass();
         }
    }

    import {ModelFactory} from "../folder1/file1";

    class Usage{
      constructor(){
          this.rez = ModelFactory.do();
      }
    }

export function do(){
  return new SomeClass();
}

import * as ModuleFactory from '../folder1/file1';

class Usage{
  constructor(){
    this.rez = ModuleFactory.do();
  }
}

folder2/file2.ts

    export module ModuleFactory{
         export function do(){
              return new SomeClass();
         }
    }

    import {ModelFactory} from "../folder1/file1";

    class Usage{
      constructor(){
          this.rez = ModelFactory.do();
      }
    }

export function do(){
  return new SomeClass();
}

import * as ModuleFactory from '../folder1/file1';

class Usage{
  constructor(){
    this.rez = ModuleFactory.do();
  }
}

问题是我得到了未定义的

rez

。在调试期间，我注意到ModelFactory抛出：

ReferenceError:ModelFactory未定义

问题出在哪里？

这样做：

folder1/file1.ts

    export module ModuleFactory{
         export function do(){
              return new SomeClass();
         }
    }

    import {ModelFactory} from "../folder1/file1";

    class Usage{
      constructor(){
          this.rez = ModelFactory.do();
      }
    }

export function do(){
  return new SomeClass();
}

import * as ModuleFactory from '../folder1/file1';

class Usage{
  constructor(){
    this.rez = ModuleFactory.do();
  }
}

folder2/file2.ts

    export module ModuleFactory{
         export function do(){
              return new SomeClass();
         }
    }

    import {ModelFactory} from "../folder1/file1";

    class Usage{
      constructor(){
          this.rez = ModelFactory.do();
      }
    }

export function do(){
  return new SomeClass();
}

import * as ModuleFactory from '../folder1/file1';

class Usage{
  constructor(){
    this.rez = ModuleFactory.do();
  }
}

---

您正在导出

ModuleFactory

，但正在导入

ModelFactory

？只是在示例代码编写过程中输入错误