When I import element-ui, it occure this problem.
ERROR in .//element-ui/lib/theme-chalk/fonts/element-icons.woff
Module build failed: Error: emitFile is required from module system
at Object.module.exports (D:\jsSpace\rent-house\vue2-happyfri\node_modules\file-loader\index.js:9:27)
at Object.loader (D:\jsSpace\rent-house\vue2-happyfri\node_modules\url-loader\dist\index.js:76:19)
@ .//css-loader!./~/element-ui/lib/theme-chalk/index.css 6:811-848

ERROR in .//element-ui/lib/theme-chalk/fonts/element-icons.ttf
Module build failed: Error: emitFile is required from module system
at Object.module.exports (D:\jsSpace\rent-house\vue2-happyfri\node_modules\file-loader\index.js:9:27)
at Object.loader (D:\jsSpace\rent-house\vue2-happyfri\node_modules\url-loader\dist\index.js:76:19)
@ .//css-loader!./~/element-ui/lib/theme-chalk/index.css 6:879-915