Question

我正在尝试使用绝对导入路径而不是Expo和React Native的相对路径。

我查看了博览会文档并找不到答案...在反应社区中搜索主题我发现babel-plugin-module-resolver但似乎世博会已经在使用它，所以我改变了我的.babelrc创建一些别名：

{
  "presets": ["babel-preset-expo"],
  "env": {
    "development": {
      "plugins": [
        "transform-react-jsx-source",
        ["module-resolver", {
          "root": ["./app"],
          "alias": {
            "Components": "./app/components",
          }
        }]
      ]
    }
  }
}

但是我收到了以下错误：

Unable to resolve module '@expo/vector-icons/glyphmaps/Entypo.json' 
from '/Users/eduardoleal/Code/lua/rook/node_modules/@expo/vector-icons/Entypo.js': 
Module does not exist in the module map or in these directories:   /Users/eduardoleal/Code/lua/rook/node_modules/@expo/vector-icons/node_modules/@expo/vector-icons/glyphmaps ,   /Users/eduardoleal/Code/lua/rook/node_modules/@expo/vector-icons/glyphmaps  This might be related to https://github.com/facebook/react-native/issues/4968 To resolve try the following:   
1. Clear watchman watches: 'watchman watch-del-all'.   
2. Delete the 'node_modules' folder: 'rm -rf node_modules && npm install'.   
3. Reset packager cache: 'rm -fr $TMPDIR/react-*' or 'npm start --reset-cache'.
ABI16_0_0RCTFatal -[ABI16_0_0RCTBatchedBridge stopLoadingWithError:] __34-[ABI16_0_0RCTBatchedBridge start]_block_invoke_2 _dispatch_call_block_and_release _dispatch_client_callout _dispatch_main_queue_callback_4CF __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ __CFRunLoopRun CFRunLoopRunSpecific GSEventRunModal UIApplicationMain main start 0x0

有没有简单的方法可以导入绝对路径？

Answer 1

如果没有root - 元素，将plugins分开并将presets更改为babel-preset-react-native-stage-0/decorator-support，别名就可以解决。

更新：Expo.io SDK v20.0.0的更改

自SDK v20.0.0起，您可以使用正常的Babel Expo预设

{
  "presets": ["babel-preset-expo"],
  "env": {
    "development": {
      "plugins": ["transform-react-jsx-source"]
    }
  },
  "plugins": [
    ["module-resolver", {
      "alias": {
        "alias-name": "./app",
      }
    }]
  ]
}

Expo.io SDK v19.0.0及之前

在版本16.0.0上使用Expo.io
在这里的世博论坛上找到了这个：https://forums.expo.io/t/relative-paths-with-expo/654/3

你能否证实这也适用于你的情况？

{
  "presets": ["babel-preset-react-native-stage-0/decorator-support"],
  "env": {
    "development": {
      "plugins": ["transform-react-jsx-source"]
    }
  },
  "plugins": [
    ["module-resolver", {
      "alias": {
        "alias-name": "./app",
      }
    }]
  ]
}

Answer 2

过了一会儿试图让这个工作。我可以通过关注.babelrc来解决问题：

{
  "presets": ["babel-preset-react-native-stage-0/decorator-support"],
  "env": {
    "development": {
      "plugins": ["transform-react-jsx-source"]
    }
  },
  "plugins": [
    ["module-resolver", {
      "alias": {
        "react-native-vector-icons": "@expo/vector-icons",
        "@expo/vector-icons/lib/create-icon-set": "react-native-vector-icons/lib/create-icon-set",
        "@expo/vector-icons/lib/icon-button": "react-native-vector-icons/lib/icon-button",
        "@expo/vector-icons/lib/create-icon-set-from-fontello": "react-native-vector-icons/lib/create-icon-set-from-fontello",
        "@expo/vector-icons/lib/create-icon-set-from-icomoon": "react-native-vector-icons/lib/create-icon-set-from-icomoon",
        "@expo/vector-icons/lib/icon-button": "react-native-vector-icons/lib/icon-button",
        "@expo/vector-icons/glyphmaps": "react-native-vector-icons/glyphmaps",
        "$components": "./app/components",
        "$config": "./app/config",
        "$helpers": "./app/helpers",
        "$navigators": "./app/navigators",
        "$reducers": "./app/reducers",
        "$screens": "./app/screens",
        "$images": "./assets/images",
        "$fonts": "./assets/fonts",
        "$icons": "./assets/icons",
        "$videos": "./assets/videos",
      }
    }]
  ]
}

我将babel-preset-expo的内容复制到我的.babelrc。它不是最好的解决方案......但它能正常工作。

有关它的更多详情here

Answer 3

对于最新的博览会用户（SDK版本> = 32）。

只需在 babel.config.js 中添加 plugins 属性（在项目根目录中找到此文件）即可。

module.exports = function (api) {
  api.cache(true);
  return {
    presets: ['babel-preset-expo'],
    plugins: [
      [
        'module-resolver',
        {
          alias: {
            'alias-name': './src/assets/bla/bla',
          },
        },
      ],
    ],
  };
};

Answer 4

./src
 |- package.json
 |- Bar/
 |   `- index.js
 `- Foo.js

package.json

{
  "name": "~" // whatever u want
}

然后

import { Foo } from "~/Foo";
import { Bar } from "~/Bar";
// ...

Answer 5

简单地让你.babelrc像这样简单：

{
  "presets": ["babel-preset-expo"],
  "env": {
    "development": {
      "plugins": ["transform-react-jsx-source"]
    }
  }
}

像这样导入：

import Entypo from '@expo/vector-icons/Entypo';

如何使用带有Expo和React Native的绝对路径导入？

5 个答案: