reactjs - 为什么 npm start (在 create-react-app 之后)无法运行？

Question

使用 create-react-app 创建示例 React 应用程序后，npm start 失败。

我已经使用节点 11.4 和 10.4 (npm 6.4.1) 尝试过此操作

npm install create-react-app -g
create-react-app t2
cd t2
npm start

预期

能够启动简单的 react 服务器以在浏览器中访问 localhost:3000

实际

服务器未启动，在我的终端中收到此信息:

$ npm start

> t2@0.1.0 start /Users/samr/dev/githubs/react/t2
> react-scripts start

/Users/samr/dev/githubs/react/t2/node_modules/ajv/lib/keyword.js:65
      throw new Error('custom keyword definition is invalid: '  + this.errorsText(validateDefinition.errors));
      ^

Error: custom keyword definition is invalid: data.errors should be boolean
    at Ajv.addKeyword (/Users/samr/dev/githubs/react/t2/node_modules/ajv/lib/keyword.js:65:13)
    at module.exports (/Users/samr/dev/githubs/react/t2/node_modules/ajv-errors/index.js:10:7)
    at Object.<anonymous> (/Users/samr/dev/githubs/react/t2/node_modules/schema-utils/src/validateOptions.js:22:1)
    at Module._compile (internal/modules/cjs/loader.js:723:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:734:10)
    at Module.load (internal/modules/cjs/loader.js:620:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:560:12)
    at Function.Module._load (internal/modules/cjs/loader.js:552:3)
    at Module.require (internal/modules/cjs/loader.js:659:17)
    at require (internal/modules/cjs/helpers.js:22:18)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! t2@0.1.0 start: `react-scripts start`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the t2@0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/samr/.npm/_logs/2019-02-09T23_19_40_848Z-debug.log

Answer 1

正如@atsnam所说，您可以在这里找到解决方案https://github.com/webpack/webpack/issues/8768 。

如果你使用 yarn

将以下内容添加到 package.json

"resolutions": {
  "ajv": "6.8.1"
}

然后运行yarn install

如果你使用 npm

npm uninstall ajv
npm install ajv@6.8.1

这对我有用