如何在 create-react-app 中配置 webpack 配置

Question

我有疑问或问题。我使用的是 React v.16，所以当我使用 create-react-app 创建一个项目时，webpack 已经预先配置好了。我想和 ol-cesium 一起工作，在 npmjs 中我看到我必须：

create an alias to the goog directory. With webpack:

resolve: {
  alias: {
     'goog': path_to_goog,
  }
}

如果我不创建 webpack 文件，请显示此错误：

./node_modules/olcs/AbstractSynchronizer.js
107:22-35 "export 'getUid' (imported as 'olBase') was not found in 'ol/index.js'

怎么解决？？？什么是path_to_goog？？？

编辑

感谢Shishir Anshuman的帮助。

现在我在 webpack.config.dev.js 和 webpack.config.prod.js 上添加了别名，但有些错误。

  resolve: {
    // This allows you to set a fallback for where Webpack should look for modules.
    // We placed these paths second because we want `node_modules` to "win"
    // if there are any conflicts. This matches Node resolution mechanism.
    // https://github.com/facebookincubator/create-react-app/issues/253
    modules: ['node_modules', paths.appNodeModules].concat(
      // It is guaranteed to exist because we tweak it in `env.js`
      process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
    ),
    // These are the reasonable defaults supported by the Node ecosystem.
    // We also include JSX as a common component filename extension to support
    // some tools, although we do not recommend using it, see:
    // https://github.com/facebookincubator/create-react-app/issues/290
    // `web` extension prefixes have been added for better support
    // for React Native Web.
    extensions: ['.web.js', '.mjs', '.js', '.json', '.web.jsx', '.jsx'],
    alias: {

      // Support React Native Web
      // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
      'react-native': 'react-native-web',
      // Ol-Cesium
      'goog': '../node_modules/olcs/goog',
    },
    plugins: [
      // Prevents users from importing files from outside of src/ (or node_modules/).
      // This often causes confusion because we only process files within src/ with babel.
      // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
      // please link the files into your node_modules/ and let module-resolution kick in.
      // Make sure your source files are compiled, as they will not be processed in any way.
      new ModuleScopePlugin(paths.appSrc, [paths.appPackageJson]),
    ],
  },

在控制台中显示此错误：

 ./node_modules/olcs/AbstractSynchronizer.js
 107:22-35 "export 'getUid' (imported as 'olBase') was not found in 'ol/index.js'

__stack_frame_overlay_proxy_console__   @   index.js:2178
handleErrors    @   webpackHotDevClient.js:178
./node_modules/react-dev-utils/webpackHotDevClient.js.connection.onmessage  @   webpackHotDevClient.js:211
./node_modules/sockjs-client/lib/event/eventtarget.js.EventTarget.dispatchEvent @   eventtarget.js:51
(anonymous) @   main.js:274
./node_modules/sockjs-client/lib/main.js.SockJS._transportMessage   @   main.js:272
./node_modules/sockjs-client/lib/event/emitter.js.EventEmitter.emit @   emitter.js:50
WebSocketTransport.ws.onmessage

Answer 1

在您提供的Codesandbox中，我无法找到根本原因，但我注意到以下几点：

我注意到您使用了 ES6 导入语句：import OLCesium from "olcs/OLCesium";。但根据 this 问题，该模块尚未移植到 ES6。

我以前从未使用过这个库，所以很难弄清楚到底发生了什么。

您尝试安装 https://www.npmjs.com/package/geom 了吗？由于错误提示缺少 4.6.4/geom/Point.js。

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