无法反应原生添加自定义资产，metro.config.js 被忽略

Question

我正在尝试在具有以下配置的本机应用程序中使用自定义资产：

"dependencies": {
    "glob": "^7.1.4",
    "metro-config": "latest",
    "react": "16.8.6",
    "react-native": "0.60.5",
    "react-native-camera": "git+https://git@github.com/react-native-community/react-native-camera",
    "react-native-easy-toast": "^1.2.0",
    "react-native-fs": "^2.14.1",
    "react-native-svg": "^9.8.4",
    "react-native-tensorflow": "^0.1.8",
    "res": "^0.4.0",
    "rn-fetch-blob": "github:joltup/rn-fetch-blob#master",
    "tflite-react-native": "0.0.5",
    "util": "^0.12.1"
  },

我在 metro.config.js 和 react-native.config.js 中声明 moule 只使用我的自定义扩展，如下所示：

module.exports = {
  project: {
    ios: {},
    android: {},
  },
  assets: [
    './src/assets/icons',
    './src/assets/svg',
    './src/assets/ai',
  ],
  assetExts: [
    ".xml", ".png", ".jpg", ".pb", ".tflite"
  ]
};

但消息仍然是一样的：

error: bundling failed: Error: Unable to resolve module `./ai/annotations/Part1.xml` from 
`...src/assets/default-assets.js`: The module `./ai/annotations/Part1.xml` could not be found from 
`.../src/assets/default-assets.js`. Indeed, none of these files exist:
  * `.../src/assets/ai/annotations/Part1.xml(.native||.android.js|.native.js|.js|.android.json|.native.json|.json|.android.ts|.native.ts|.ts|.android.tsx|.native.tsx|.tsx)`

所以 metro.config.js 和 react-native.config.js 显然被忽略了

更新：在具有最新依赖项的全新 react-native 应用程序中尝试时，会显示一条验证消息：

● Validation Warning:

  Unknown option "assets" with value ["./src/assets/ai"] was found.
  This is probably a typing mistake. Fixing it will remove this message.

● Validation Warning:

  Unknown option "assetExts" with value [".xml", ".png", ".jpg", ".pb", ".tflite"] was found.
  This is probably a typing mistake. Fixing it will remove this message.

UPDATE2：我在一个单独的分支上创建了一个展示问题的存储库以及一个不工作的解决方案建议（使用 app.json 而不是 metro.config.js 或 react-native.config.js）。 你可以在这里找到它：

https://github.com/Macilias/ReactNativeAssetFail

Answer 1

更新，我设法通过从 app.json 指向 metro.config.js 来消除错误，如下所示：

{
  "name": "reactNativeTestapp",
  "displayName": "reactNativeTestapp",
  "packagerOpts": {
    "config": "metro.config.js"
  }
}

Metro.config.js 的内容如下所示：

const {getDefaultConfig} = require('metro-config');

module.exports = (async () => {
  const {
    resolver: {sourceExts, assetExts},
  } = await getDefaultConfig();
  return {
    resolver: {
      assetExts: [assetExts, 'txt', 'xml', 'png', 'jpg', 'pb', 'tflite'],
      sourceExts: [...sourceExts, 'txt', 'xml', 'png', 'jpg', 'pb', 'tflite'],
    },
  };
})();

xml 文件的内容如何没有以 App.js 的形式显示，它只打印一个可能对应于行数的数字？ 但是我怎样才能真正访问文件的内容呢？

Answer 2

尝试将它们添加到具有相同结构的react-native.config.js文件中。 我的看起来像这样：

module.exports = {
    assets: ["./app/assets/fonts"]
}

不要忘记清洁和运行。