reactjs - React native with haul 不工作，抛出一些加载器问题

Question

我已将 haul 添加到我的 React Native 项目中，以分析我的发布构建失败的原因。但我遇到了另一个问题。我有一个带有以下配置的 webpack.haul.js

module.exports = {
    entry: './index.js',
};

当我运行 react-native run-android 时，我看到以下错误。有人可以帮帮我吗。

ERROR  Failed to compile.

./node_modules/native-base-shoutem-theme/src/StyleProvider.js 10:19
Module parse failed: Unexpected token (10:19)
You may need an appropriate loader to handle this file type.
|  */
| export default class StyleProvider extends React.Component {
>   static propTypes = {
|     children: PropTypes.element.isRequired,
|     style: PropTypes.object,
@ ./node_modules/native-base-shoutem-theme/index.js 3:0-48 7:0-15:2
@ ./node_modules/native-base/dist/src/index.js
@ ./screens/Academics/HomeWorkScreen.js
@ ./App.js
@ ./index.js
@ multi ./node_modules/haul/src/vendor/polyfills/Object.es6.js ./node_modules/haul/src/vendor/polyfills/console.js ./node_modules/haul/src/vendor/polyfills/error-guard.js ./node_modules/haul/src/vendor/polyfills/Number.es6.js ./node_modules/haul/src/vendor/polyfills/String.prototype.es6.js ./node_modules/haul/src/vendor/polyfills/Array.prototype.es6.js ./node_modules/haul/src/vendor/polyfills/Array.es6.js ./node_modules/haul/src/vendor/polyfills/Object.es7.js ./node_modules/haul/src/vendor/polyfills/babelHelpers.js ./node_modules/react-native/Libraries/Core/InitializeCore.js ./node_modules/haul/src/utils/polyfillEnvironment.js ./index.js

./node_modules/native-base-shoutem-theme/src/connectStyle.js 116:26
Module parse failed: Unexpected token (116:26)
You may need an appropriate loader to handle this file type.
| 
|     class StyledComponent extends React.Component {
>       static contextTypes = {
|         theme: ThemeShape,
|         // The style inherited from the parent
@ ./node_modules/native-base-shoutem-theme/index.js 1:0-46 7:0-15:2
@ ./node_modules/native-base/dist/src/index.js
@ ./screens/Academics/HomeWorkScreen.js
@ ./App.js
@ ./index.js
@ multi ./node_modules/haul/src/vendor/polyfills/Object.es6.js ./node_modules/haul/src/vendor/polyfills/console.js ./node_modules/haul/src/vendor/polyfills/error-guard.js ./node_modules/haul/src/vendor/polyfills/Number.es6.js ./node_modules/haul/src/vendor/polyfills/String.prototype.es6.js ./node_modules/haul/src/vendor/polyfills/Array.prototype.es6.js ./node_modules/haul/src/vendor/polyfills/Array.es6.js ./node_modules/haul/src/vendor/polyfills/Object.es7.js ./node_modules/haul/src/vendor/polyfills/babelHelpers.js ./node_modules/react-native/Libraries/Core/InitializeCore.js ./node_modules/haul/src/utils/polyfillEnvironment.js ./index.js

./node_modules/rn-fetch-blob/index.js 13:12
Module parse failed: Unexpected token (13:12)
You may need an appropriate loader to handle this file type.
|   AppState,
| } from 'react-native'
> import type {
|   RNFetchBlobNative,
|   RNFetchBlobConfig,
@ ./screens/Academics/HomeWorkScreen.js 1:603-627
@ ./App.js
@ ./index.js
@ multi ./node_modules/haul/src/vendor/polyfills/Object.es6.js ./node_modules/haul/src/vendor/polyfills/console.js ./node_modules/haul/src/vendor/polyfills/error-guard.js ./node_modules/haul/src/vendor/polyfills/Number.es6.js ./node_modules/haul/src/vendor/polyfills/String.prototype.es6.js ./node_modules/haul/src/vendor/polyfills/Array.prototype.es6.js ./node_modules/haul/src/vendor/polyfills/Array.es6.js ./node_modules/haul/src/vendor/polyfills/Object.es7.js ./node_modules/haul/src/vendor/polyfills/babelHelpers.js ./node_modules/react-native/Libraries/Core/InitializeCore.js ./node_modules/haul/src/utils/polyfillEnvironment.js ./index.js


FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:bundleDemshReleaseJsAndAssets'.
> Process 'command 'node'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Answer 1

您的问题是，不知何故，babel 没有正确配置以编译这些错误中提到的代码中存在的功能。

具体问题:

1. 静态方法属性(你需要 https://babeljs.io/docs/en/babel-plugin-proposal-class-properties )
2. 流类型(你需要 https://babeljs.io/docs/en/babel-plugin-transform-flow-strip-types )

很难说出你的配置到底出了什么问题，但一种更快的测试方法是直接在这些文件上运行 babel CLI。如果您确保 BABEL_ENV 和任何其他 babel cli/env/API 标志的设置方式与它们在 webpack 构建中的设置方式相同(您可能需要进行一些调试以找到 babel- loader 被应用)，你可以做例如 yarn run babel node_modules/native-base-shoutem-theme/src/StyleProvider.js

如果你能重现这样的问题，你可以在你的 babel 配置中进行更严格的循环试验，直到找到解决方案。

一个好的起点是更新 babel 和你安装的所有预设/插件。