命令“yarn add react-native --exact”失败

Question

我尝试创建新项目，但发生了这种情况，我按照他们所说的那样更新了核心How to update core-js to core-js@3 dependency? 但也没有任何帮助我使用 Windows 10，我该怎么办？

c:\Users\alothman\Desktop>npx react-native init travelApp
This will walk you through creating a new React Native project in c:\Users\alothman\Desktop\travelApp
Using yarn v1.21.1
Installing react-native...
yarn add v1.21.1
info No lockfile found.
[1/4] Resolving packages...
warning react-native > fbjs > core-js@2.6.11: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
warning react-native > create-react-class > fbjs > core-js@1.2.7: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
warning react-native > fbjs-scripts > core-js@2.6.11: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
warning react-native > metro-babel-register > core-js@2.6.11: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3.
[2/4] Fetching packages...
error An unexpected error occurred: "C:\\Users\\alothman\\AppData\\Local\\Yarn\\Cache\\v6\\npm-@babel-runtime-7.7.7-194769ca8d6d7790ec23605af9ee3e42a0aa79cf-integrity\\node_modules\\@babel\\runtime\\.yarn-metadata.json: Unexpected token \u0000 in JSON at position 0".
info If you think this is a bug, please open a bug report with the information provided in "c:\\Users\\alothman\\Desktop\\travelApp\\yarn-error.log".
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.
{ Error: Command failed: yarn add react-native --exact
    at checkExecSyncError (child_process.js:629:11)
    at execSync (child_process.js:666:13)
    at run (C:\Users\alothman\AppData\Roaming\npm\node_modules\react-native-cli\index.js:294:5)
    at createProject (C:\Users\alothman\AppData\Roaming\npm\node_modules\react-native-cli\index.js:249:3)
    at init (C:\Users\alothman\AppData\Roaming\npm\node_modules\react-native-cli\index.js:200:5)
    at Object.<anonymous> (C:\Users\alothman\AppData\Roaming\npm\node_modules\react-native-cli\index.js:153:7)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
  status: 1,
  signal: null,
  output: [ null, null, null ],
  pid: 5380,
  stdout: null,
  stderr: null }
Command `yarn add react-native --exact` failed.

Answer 1

我认为您可能会收到此错误，因为您之前已经全局安装了react-native-cli。因此，首先使用以下命令删除react-native-cli ：

npm uninstall -g react-native-cli

现在尝试创建项目：

npx react-native init travelApp

Answer 2

npm config set registry "https://registry.npmjs.org"

这对我有用！