Solutions to the most common modern JS errors

Common Webpack errors

• "extract-text-webpack-plugin" loader is used without the corresponding plugin
• no configuration file found and no output filename configured via cli option. a configuration file could be named 'webpack.config.js' in the current directory. use --help to display the cli options.

React common errors

• getinitialstate was defined on app, a plain javascript class. this is only supported for classes created using react.createclass. did you mean to define a state property instead?