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cesium-webpack-example

A minimal recommended setup for an applications using Cesium with Webpack.

Jump to the Webpack 5 directory for the most up to date example. We also provide a Webpack 4 example if you are still on the older version.

Running this application

Please switch to the corresponding sub-directory for the version of Webpack you're using to see how to run this example application

Requiring Cesium in your application

Regardless which version of Webpack you're using you should be able to use CesiumJS in the same way.

We recommend importing named exports from the Cesium ES module, via the import keyword. This allows webpack to tree shake your application automatically.

Import named modules from Cesium

import { Color } from "cesium";
var c = Color.fromRandom();

Import Cesium static asset files

import "cesium/Build/Cesium/Widgets/widgets.css";

Cesium sub-packages

CesiumJS requires a few static files to be hosted on your server, like web workers and SVG icons. These examples are set up to copy these directories already if you install the whole cesium package.

new CopyWebpackPlugin({
  patterns: [
    { from: path.join(cesiumSource, "Workers"), to: `${cesiumBaseUrl}/Workers`, },
    { from: path.join(cesiumSource, "ThirdParty"), to: `${cesiumBaseUrl}/ThirdParty`, },
    { from: path.join(cesiumSource, "Assets"), to: `${cesiumBaseUrl}/Assets`, },
    { from: path.join(cesiumSource, "Widgets"), to: `${cesiumBaseUrl}/Widgets`, },
  ],
}),

However if you only install @cesium/engine then you should change the paths in webpack.config.js to the ones below:

new CopyWebpackPlugin({
  patterns: [
    { from: 'node_modules/@cesium/engine/Build/Workers', to: `${cesiumBaseUrl}/Workers` },
    { from: 'node_modules/@cesium/engine/Build/ThirdParty', to: `${cesiumBaseUrl}/ThirdParty` },
    { from: 'node_modules/@cesium/engine/Source/Assets', to: `${cesiumBaseUrl}/Assets` },
  ],
}),

Additionally you will have to import a different widgets css file in src/index.js.

// Change this import
import "cesium/Build/Cesium/Widgets/widgets.css";

// To this one from the cesium/engine package
import "@cesium/engine/Source/Widget/CesiumWidget.css";

Removing pragmas

To remove pragmas such as a traditional Cesium release build, use the strip-pragma-loader.

Install the plugin with npm,

npm install strip-pragma-loader --save-dev

and include the loader in module.rules with debug set to false.

rules: [
  {
    test: /\.js$/,
    enforce: "pre",
    include: path.resolve(__dirname, cesiumSource),
    use: [
      {
        loader: "strip-pragma-loader",
        options: {
          pragmas: {
            debug: false,
          },
        },
      },
    ],
  },
];

Contributions

Pull requests are appreciated. Please use the same Contributor License Agreement (CLA) used for Cesium.

Even though this project has nested package.json projects we are not using npm workspaces to preserve a more "stand-alone" nature for each example. This allows other developers to copy the sub-directory and use it as-is for a new project.

Make sure you run npm install in the root directory to set up linting and git commit hooks

Available scripts

The top level scripts in the root directory are mostly for development of this repo itself:

  • npm run eslint, npm run prettier, npm run prettier-check - Lint this project to maintain code style

There are also some shortcuts to run the code for each Webpack version. These are just for convenience and behave the same as changing to the sub-directories and running the commands there

  • npm run start-4 - Run the Webpack 4 example
  • npm run build-4 - Build the Webpack 4 example
  • npm run start-5 - Run the Webpack 5 example
  • npm run build-5 - Build the Webpack 5 example

Developed by the Cesium team.