First,install Babel. Then install babel-preset-react-app. npm install babel-preset-react-app --save-dev Then create a file named.babelrcwith following contents in the root folder of your project: {"presets": ["react-app"] } This preset uses theuseBuiltInsoption withtransform-object-rest-sp...
npm install babel-preset-react-app --save-dev 或者 bash yarn add babel-preset-react-app --dev 检查.babelrc或babel.config.js文件: 确保你的Babel配置文件(.babelrc或babel.config.js)中正确引用了babel-preset-react-app。配置文件应该类似于: json { "presets": ["react-app"] } 清理和重建: ...
npm install babel-preset-react-app --save-dev Then create a file named.babelrcwith following contents in the root folder of your project: {"presets": ["react-app"] } This preset uses theuseBuiltInsoption withtransform-object-rest-spreadandtransform-react-jsx, which assumes thatObject.assignis...
出现bug的原因是: 环境变量没配置好,虽然在webpack.dev.js 中配置了mode: 'development'配置项,但这个环境变量是代码运行的环境变量,不是babel运行的环境变量,所以还需要定义。 解决方案: //下载 cross-env 。专门用于定义环境变量的库npm install --save-dev cross-env//在webpage运行命令的前面加上配置在packa...
npmPackages: react: 16.12.0 => 16.12.0 react-dom: 16.12.0 => 16.12.0 react-scripts: 3.3.1 => 3.3.1 npmGlobalPackages: create-react-app: Not Found tsconfig.json { "compilerOptions": { "target": "es6", "lib": [ "dom",
create-react-app 是由 React 官方提供并推荐使用构建新的 React 单页面应用程序的最佳方式，不过目前...
然后安装 babel-preset-react-app。 npm install babel-preset-react-app --save-dev 然后在项目的根文件夹中创建一个名为.babelrc的文件,其中包含以下内容: {"presets":["react-app"]} 此预设使用useBuiltIns选项和transform-object-rest-spread和transform-react-jsx,它假定Object.assign可用或已填充。
npm install --save-dev @babel/plugin-proposal-private-property-in-object Run Code Online (Sandbox Code Playgroud) 也许这是解决您的问题的最佳方法,也可以将其安装在devDependencies. 长答案: 由于npm 错误本身表明,安装所需的包是dev-dependency可行的,并且因为它是已弃用的包,所以它应该是安全的。归档...
npm install --save-dev @babel/plugin-proposal-private-property-in-object --legacy-peer-deps 为我...
Or try to use yarn instead of npm. Also, make sure that your node version is at least 6. And if anything of that helps, just install this preset putting it in package.json. Don't know what can be a reason really. Sometimes there is a packages on npm which include into dependencies...