Webpack -在Angular 2中调用外部JS

{
  "projects": {
    "your-project-name": {
      "architect": {
        "build": {
          "options": {
            "scripts": [
              "src/assets/js/external-script.js"
            ]
          }
        },
        "test": {
          "options": {
            "scripts": [
              "src/assets/js/external-script.js"
            ]
          }
        }
      }
    }
  }
}

module.exports = {
  plugins: [
    new webpack.ProvidePlugin({
      externalFunction: 'external-script.js'
    })
  ]
};

{
  "projects": {
    "your-project-name": {
      "architect": {
        "build": {
          "options": {
            "customWebpackConfig": {
              "path": "./custom-webpack.config.js"
            }
          }
        },
        "test": {
          "options": {
            "customWebpackConfig": {
              "path": "./custom-webpack.config.js"
            }
          }
        }
      }
    }
  }
}

declare const externalFunction: any;

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent {
  ngOnInit() {
    externalFunction();
  }
}