构建 JS 包时出现 Expo 启动错误：在 HMRClient.js 中输入 cast

Question

问题：

我最近在我的 expo 项目 (React Native) 中遇到了一个阻塞问题。

类型转换表达式应该用括号括起来

我检查了我的代码，没有发现任何会导致此问题的更改。

当我使用 MetroBundler 键入启动 expo building (shell) 的说明时，它总是会抛出错误。

expo start
Expo DevTools is running at http://localhost:19002 Opening DevTools in the browser... (press shift-d to disable) Starting Metro Bundler
错误 :

Failed building JavaScript bundle.
SyntaxError: C:\xamppN\htdocs\mobile-new\node_modules\react-native\Libraries\Utilities\HMRClient.js: The type cast expression is expected to be wrapped with parenthesis (284:31)

  282 | function flushEarlyLogs(client) {
  283 |   try {
> 284 |     pendingLogs.forEach(([level: LogLevel, data: Array<mixed>]) => {
      |                                ^
  285 |       HMRClient.log(level, data);
  286 |     });
  287 |   } finally {

类型转换表达式应该用括号括起来

我试过了：

正在编辑目标文件，它在节点模块中，不是非常有效 如果我以后必须安装纱线。
删除所有node_modules并重新安装没有成功
正在将 expo 更新到最新版本，没有任何改变，同样的错误

更多信息：

package.json :

 "dependencies": {
    "antd": "^3.23.2",
    "expo": "^39.0.0", 
    "expo-asset": "~8.2.0",
    "expo-av": "~8.6.0",
    "expo-barcode-scanner": "~9.0.0",
    "expo-cli": "^3.27.14",
    "expo-constants": "~9.2.0",
    "expo-localization": "~9.0.0",
    "expo-permissions": "~9.3.0",
    "expo-secure-store": "~9.2.0",
    "expo-updates": "~0.3.3",
    "expokit": "31.0.2",
    "moment": "^2.22.2",
    "node-forge": "^0.10.0",
    "npm": "^6.14.8",
    "react": "16.13.1",
    "react-datetime-inputs": "^0.0.6",
    "react-mixin": "^2.0.2",
    "react-native": "https://github.com/expo/react-native/archive/sdk-39.0.0.tar.gz",
    "react-native-create-bridge": "^2.0.1",
    "react-native-dialog": "^5.6.0",
    "react-native-dialog-input": "^1.0.7",
    "react-native-gesture-handler": "~1.7.0",
    "react-native-imei": "^0.1.2",
    "react-native-modal-datetime-picker": "^7.5.0",
    "react-native-pay-password": "^0.0.2",
    "react-native-reanimated": "~1.13.0",
    "react-native-sentry": "^0.43.2",
    "react-native-sha1": "^1.2.3",
    "react-navigation": "^4.0.6",
    "react-navigation-drawer": "^2.2.2",
    "react-select": "^3.0.4",
    "react-timer-mixin": "^0.13.4",
    "sentry-expo": "~2.0.0",
    "yarn": "^1.16.0"

Answer 1

这是 "yarn": "^1.16.0" and "npm": "^6.14.8" 之间的冲突。

您应该选择 ONE 包管理器并避免交叉依赖。

构建 JS 包时出现 Expo 启动错误：在 HMRClient.js 中输入 cast

Expo start error on building JS bundle : type cast in HMRClient.js

npm

reactjs

react-native

yarnpkg

expo

问题：

我试过了：

更多信息：