在 Angular 2 项目中导入和使用带有 Typescript 2 的无类型传单 JS 插件

Question

我在 Angular 2 应用程序中使用 LeafletJS 库。库本身运行良好，因为我已经包含了类型定义 (leaflet.d.ts)，当然还有传单节点模块。

我正在尝试为传单库导入一个名为“leaflet-canvasicon”的插件，但没有可用的类型定义，因为每当我尝试包含它时它都是用 ES5 编写的，编译器很满意，但我在控制台收到以下错误：

leaflet-src.js:314
Uncaught TypeError: this.callInitHooks is not a function
    at Object.NewClass (http://localhost:2080/main.bundle.js:58716:8)
    at http://localhost:2080/main.bundle.js:77650:180
    at Object.<anonymous> (http://localhost:2080/main.bundle.js:77652:3)
    at __webpack_require__ (http://localhost:2080/inline.js:53:30)
    at Object.<anonymous> (http://localhost:2080/main.bundle.js:54476:18)
    at __webpack_require__ (http://localhost:2080/inline.js:53:30)
    at Object.<anonymous> (http://localhost:2080/main.bundle.js:54411:90)
    at __webpack_require__ (http://localhost:2080/inline.js:53:30)
    at Object.<anonymous> (http://localhost:2080/main.bundle.js:54600:70)
    at __webpack_require__ (http://localhost:2080/inline.js:53:30)

我想到了很多解决方案：

• 为插件创建一个新的类型定义 (leaflet-canvasicon.d.ts) 并使用 Typescript 中的命名空间声明合并功能，以便仍将插件用作 L.CanvasIcon

• 使用打字稿重写插件，扩展namespace L中的现有接口。

• 停止使用键入的“传单”，只需导入用 ES5 编写的节点模块，然后在 Angular 的 typings.d.ts 文件中添加 L 声明：declare var L: any;

但每次我遇到编译器问题。我想我做错了。如何包含插件，让编译器满意并能够将其用作L.CanvasIcon

这里是package.json 文件：

 "dependencies": {
        "@angular/common": "2.1.2",
        "@angular/compiler": "2.1.2",
        "@angular/compiler-cli": "2.1.2",
        "@angular/core": "2.1.2",
        "@angular/forms": "2.1.2",
        "@angular/http": "2.1.2",
        "@angular/platform-browser": "2.1.2",
        "@angular/platform-browser-dynamic": "2.1.2",
        "@angular/platform-server": "2.1.2",
        "@angular/router": "3.1.2",
        "@types/leaflet": "^1.0.36",
        "core-js": "^2.4.1",
        "leaflet": "^1.0.1",
        "leaflet-canvasicon": "^0.1.6",
        "leafletjs-canvas-overlay": "^1.0.1",
        "rxjs": "5.0.0-rc.1",
        "ts-helpers": "^1.1.2",
        "zone.js": "^0.6.26"
      },
      "devDependencies": {
        "angular-cli": "1.0.0-beta.19-3",
        "ts-node": "1.6.1",
        "tslint": "3.15.1",
        "typescript": "2.0.6",
        "typings": "^1.5.0"
      }
    }

Answer 1

这是与缺少输入无关的运行时错误。问题与leaflet 版本不匹配有关。

似乎leaflet-canvasicon 是为旧版本的leaflet 设计的。尝试使用版本0.7.x 回退到leaflet。

 "dependencies": {
        "@angular/common": "2.1.2",
        "@angular/compiler": "2.1.2",
        "@angular/compiler-cli": "2.1.2",
        "@angular/core": "2.1.2",
        "@angular/forms": "2.1.2",
        "@angular/http": "2.1.2",
        "@angular/platform-browser": "2.1.2",
        "@angular/platform-browser-dynamic": "2.1.2",
        "@angular/platform-server": "2.1.2",
        "@angular/router": "3.1.2",
        "@types/leaflet": "0.7.x",
        "core-js": "^2.4.1",
        "leaflet": "0.7.x", // note the change
        "leaflet-canvasicon": "^0.1.6",
        "leafletjs-canvas-overlay": "^1.0.1",
        "rxjs": "5.0.0-rc.1",
        "ts-helpers": "^1.1.2",
        "zone.js": "^0.6.26"
      },
      "devDependencies": {
        "angular-cli": "1.0.0-beta.19-3",
        "ts-node": "1.6.1",
        "tslint": "3.15.1",
        "typescript": "2.0.6",
        "typings": "^1.5.0"
      }
    }

对于未来，您可以记住this.callInitHooks is not a function 是在将旧扩展加载到leaflet 版本后典型问题 >=1

Answer 2

如果您需要在 typescript 中使用传单插件，请在传单之后导入此文件。

declare module L {
    // plugins that extend Class i.e L.MyClass
    export let MyClass:any;
    // plugins that uses class factory i.e myClass
    export let myClass:any;

   //plugins that extend Control comes here i.e L.Control.Navbar
   export namespace Control {
      export let Navbar: any;
   }
   // plugins that have control factories come here i.e. L.control.navbar
  export namespace control {
     export let navbar: any;
  }

  //plugins that extend Layer comes here i.e L.Layer.NewLayer
   export namespace Layer {
      export let NewLayer: any;
   }
  // plugins that have layer factories come here i.e. L.layer.newLayer
  export namespace layer {
     export let newLayer: any;
  }
  //plugins that extend Handler comes here i.e. L.Handler.NewHandler
   export namespace Handler {
      export let NewHandler: any;
   }
  // plugins that have handler factories come here i.e. L.Handler.newHandler
  export namespace handler {
     export let newHandler: any;
  }
}

如果你愿意，你可以明确地使用类型。