react-scripts V2.1.3 出现错误。我们刚刚从 V1.x 迁移到此。在 react-scripts 升级之前,这一切都运行良好。
源文件(元数据访问,执行导出)是 typescript ,并具有以下代码:
export const NAVIGATION = 'Navigation';
引用 const 的文件是 Javascript,如下所示:
import { WIDGET_TREE, NAVIGATION, metadataScan } from './universal/metadataAccess';
...
const scanNavigation = await metadataScan(dynamoClient, NAVIGATION);
错误是:
Creating an optimized production build...
Failed to compile.
./src/App.jsx
Attempted import error: 'NAVIGATION' is not exported from './universal/metadataAccess'.
如果我要修复这个错误(上图),我会在另一个 const 上遇到同样的问题。可悲的是,一次报告一个错误。我也在导出的枚举上得到它。全部来自 Typescript 文件。我将引用文件的扩展名更改为 .tsx(来自 .jsx),这没有区别。
我在 Typescript compile、webpack 和 babel 的源代码中搜索了字符串“Attempted import”,但没有找到任何东西,所以我什至不知道是哪个代码导致了这个错误。
我还尝试在导入语句中的文件名中添加“.js”,并且(生成的)Javascript 文件有这一行:
exports.NAVIGATION = 'Navigation';
它得到相同的结果。我尝试更改导入语句以引用一个不存在的文件,但我得到一个不同的错误,所以它似乎正在查找导入的文件。
关于如何让它运行的任何想法?
最佳答案
下面是 react-native-web 的,包括“尝试导入错误”的解决方案,也许对你也有帮助。
npm install --save-dev react-app-rewired
创建 config-overrides.js
在您的项目根目录中// used by react-app-rewired
const webpack = require('webpack');
const path = require('path');
module.exports = {
webpack: function (config, env) {
config.module.rules[1].use[0].options.baseConfig.extends = [
path.resolve('.eslintrc.js'),
];
// To let alias like 'react-native/Libraries/Components/StaticRenderer'
// take effect, must set it before alias 'react-native'
delete config.resolve.alias['react-native'];
config.resolve.alias['react-native/Libraries/Components/StaticRenderer'] =
'react-native-web/dist/vendor/react-native/StaticRenderer';
config.resolve.alias['react-native'] = path.resolve(
'web/aliases/react-native',
);
// Let's force our code to bundle using the same bundler react native does.
config.plugins.push(
new webpack.DefinePlugin({
__DEV__: env === 'development',
}),
);
// Need this rule to prevent `Attempted import error: 'SOME' is not exported from` when `react-app-rewired build`
// Need this rule to prevent `TypeError: Cannot assign to read only property 'exports' of object` when `react-app-rewired start`
config.module.rules.push({
test: /\.(js|tsx?)$/,
// You can exclude the exclude property if you don't want to keep adding individual node_modules
// just keep an eye on how it effects your build times, for this example it's negligible
// exclude: /node_modules[/\\](?!@react-navigation|react-native-gesture-handler|react-native-screens)/,
use: {
loader: 'babel-loader',
},
});
return config;
},
paths: function (paths, env) {
paths.appIndexJs = path.resolve('index.web.js');
paths.appSrc = path.resolve('.');
paths.moduleFileExtensions.push('ios.js');
return paths;
},
};
同时创建一个 web/aliases/react-native/index.js
// ref to https://levelup.gitconnected.com/react-native-typescript-and-react-native-web-an-arduous-but-rewarding-journey-8f46090ca56b
import {Text as RNText, Image as RNImage} from 'react-native-web';
// Let's export everything from react-native-web
export * from 'react-native-web';
// And let's stub out everything that's missing!
export const ViewPropTypes = {
style: () => {},
};
RNText.propTypes = {
style: () => {},
};
RNImage.propTypes = {
style: () => {},
source: () => {},
};
export const Text = RNText;
export const Image = RNImage;
// export const ToolbarAndroid = {};
export const requireNativeComponent = () => {};
现在你可以运行 react-app-rewired start
而不是 react-scripts start
关于从 Typescript 文件导入时,Javascript 代码在 react-scripts 构建中获取 "Attempted import error:",我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54549860/