在typescript类型定义中表示内部类

class OuterClass {
  private outerProperty: string;

  constructor(outerProperty: string) {
    this.outerProperty = outerProperty;
  }

  public outerMethod(): void {
    console.log("This is the outer method.");
  }

  public getInnerClassInstance(): InnerClass {
    return new InnerClass();
  }

  public innerMethod(): void {
    console.log("This is the outer method calling the inner method.");
    const innerInstance = new InnerClass();
    innerInstance.innerMethod();
  }

  class InnerClass {
    private innerProperty: number;

    constructor() {
      this.innerProperty = 10;
    }

    public innerMethod(): void {
      console.log("This is the inner method.");
    }
  }
}

const outerInstance = new OuterClass("outer");
outerInstance.outerMethod(); // Output: This is the outer method.
outerInstance.innerMethod(); // Output: This is the outer method calling the inner method.

const innerInstance = outerInstance.getInnerClassInstance();
innerInstance.innerMethod(); // Output: This is the inner method.