诱人的 TypeScript 视频教程 #66 模块

https://www.typescriptlang.org/docs/handbook/modules.html

index.ts

// import * as c from './classes';
// import { Shape, drawShapes } from './classes';
import Shape, { drawShapes } from './classes';

let a: Shape = {
    draw: () => { }
}

drawShapes(a);

class Circle implements Shape {
    draw(): void {
        console.log("drawing Circle")
    }
}

class Rectangle implements Shape {
    draw(): void {
        console.log('drawing Rectangle')
    }
}

let circle = new Circle();
let rectangle = new Rectangle();

let c = drawShapes(circle);

classes.ts

export default interface Shape {
    draw(): void;
}

// function drawShapes(shape: Shape): Shape {
//  shape.draw();
//  return shape;
// }

export function drawShapes<T extends Shape>(shape: T): T {
    shape.draw();
    return shape;
}