完整錯誤資訊如下:

ERROR in multi ./app/js/index.js
Module not found: Error: Can't resolve 'babel' in 'E:\works\ES6'
BREAKING CHANGE: It's no longer allowed to omit the '-loader' suffix when using loaders.
                 You need to specify 'babel-loader' instead of 'babel',
                 see https://webpack.js.org/migrate/3/#automatic-loader-module-name-extension-removed
 @ multi ./app/js/index.js index[0]
 

我的配置程式碼：

			module:{
				rules:[{
					test:/\.js$/,
					loader:'babel'
				}]
			}

翻譯下錯誤資訊：

不再允許在使用載入器時省略“-loader”字尾。你需要指定’babel-loader’而不是’babel’…

那好，趕緊加上-loader字尾：

			module:{
				rules:[{
					test:/\.js$/,
					loader:'babel-loader'
				}]
			}

執行，又報錯：

ERROR in ./app/js/index.js
Module build failed (from ./node_modules/babel-loader/lib/index.js):
Error: Cannot find module '@babel/core'
 
 
[email protected] requires Babel 7.x (the package '@babel/core'). If you'd like to use Babel 6.x ('babel-core'), you should install '[email protected]'.
    at Function.Module._resolveFilename (module.js:547:15)
    at Function.Module._load (module.js:474:25)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (E:\works\ES6\node_modules\babel-loader\lib\index.js:10:11)
    at Module._compile (module.js:652:30)
    at Module._extensions..js (module.js:663:10)
    at Object.require.extensions.(anonymous function) [as .js] (E:\works\ES6\node_modules\babel-register\lib\node.js:152:7)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at loadLoader (E:\works\ES6\node_modules\loader-runner\lib\loadLoader.js:13:17)
    at iteratePitchingLoaders (E:\works\ES6\node_modules\loader-runner\lib\LoaderRunner.js:169:2)
    at runLoaders (E:\works\ES6\node_modules\loader-runner\lib\LoaderRunner.js:362:2)
 @ multi ./app/js/index.js index[0]
 

看起來大致試說 babel-loader 模組的版本的問題，趕緊百度，得一傳送門：

果然是版本的問題，只需要解除安裝原來的8.x的，安裝7.x版本的就可以了： npm uninstall babel-loader npm install [email protected] 最後執行，問題完美解決！