在webpack.config.js按老师的内容写完后，我运行gulp并不能成功，提示是我

Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.

 - configuration.module has an unknown property 'loader'. These properties are valid:

   object { exprContextCritical?, exprContextRecursive?, exprContextRegExp?, exprContextRequest?, noParse?, rules?, defaultRules?, unknownContextCritical?, unknownContextRecursive?, unknownContextRegExp?, unknownContextRequest?, unsafeCache?, wrappedContextCritical?, wrappedContextRecursive?, wrappedContextRegExp?, strictExportPresence?, strictThisContextOnImports? }