找不到模块babel

再次得到同样的错误：Error: Cannot find module 'babel-preset-es2015'。

完整错误日志：

ERROR in ./main.js Module build failed (from ./node_modules/babel-loader/lib/index.js): Error: Cannot find module 'babel-preset-es2015' from 'C:\Users\hp\Desktop\reactApp'
 at Function.module.exports [as sync] (C:\Users\hp\Desktop\reactApp\node_modules\resolve\lib\sync.js:43:15)
 at resolveStandardizedName (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\files\plugins.js:101:31)
 at resolvePreset (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\files\plugins.js:58:10)
 at loadPreset (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\files\plugins.js:77:20)
 at createDescriptor (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\config-descriptors.js:154:9)
 at items.map (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\config-descriptors.js:109:50)
 at Array.map ()
 at createDescriptors (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\config-descriptors.js:109:29)
 at createPresetDescriptors (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\config-descriptors.js:101:10)
 at passPerPreset (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\config-descriptors.js:58:96) @ multi (webpack)-dev-server/client?http://localhost:8080 (webpack)/hot/dev-server.js ./main.js main[2]

对于Babel版本6，包名称为babel-preset-es2015，而对于Babel版本7，包名称为@babel/preset-es2015。

从错误看，你似乎使用的是版本7.不推荐使用es20XX-presets，所以我建议你切换到@babel/preset-env。

首先安装预设（使用npm）：

npm install --save-dev @babel/preset-env

然后将预设添加到.babelrc

{
    presets: ["@babel/preset-env"]
}

找不到模块babel

再次得到同样的错误：Error: Cannot find module 'babel-preset-es2015'。

完整错误日志：

ERROR in ./main.js Module build failed (from ./node_modules/babel-loader/lib/index.js): Error: Cannot find module 'babel-preset-es2015' from 'C:\Users\hp\Desktop\reactApp'
 at Function.module.exports [as sync] (C:\Users\hp\Desktop\reactApp\node_modules\resolve\lib\sync.js:43:15)
 at resolveStandardizedName (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\files\plugins.js:101:31)
 at resolvePreset (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\files\plugins.js:58:10)
 at loadPreset (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\files\plugins.js:77:20)
 at createDescriptor (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\config-descriptors.js:154:9)
 at items.map (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\config-descriptors.js:109:50)
 at Array.map ()
 at createDescriptors (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\config-descriptors.js:109:29)
 at createPresetDescriptors (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\config-descriptors.js:101:10)
 at passPerPreset (C:\Users\hp\Desktop\reactApp\node_modules\@babel\core\lib\config\config-descriptors.js:58:96) @ multi (webpack)-dev-server/client?http://localhost:8080 (webpack)/hot/dev-server.js ./main.js main[2]

对于Babel版本6，包名称为babel-preset-es2015，而对于Babel版本7，包名称为@babel/preset-es2015。

从错误看，你似乎使用的是版本7.不推荐使用es20XX-presets，所以我建议你切换到@babel/preset-env。

首先安装预设（使用npm）：

npm install --save-dev @babel/preset-env

然后将预设添加到.babelrc

{
    presets: ["@babel/preset-env"]
}