webpack4.x 報錯：Error: Chunk.entrypoints: Use Chunks.groupsIterable and filter by instanceof Entrypoint instead

在配置webpack4報錯：Error: Chunk.entrypoints: Use Chunks.groupsIterable and filter by instanceof Entrypoint instead時，應該是插extract-text-webpack-plugin的版本問題

解決方案如下：

npm install extract-text-webpack-plugin@next

安裝后的版本是（package.json）：

 "devDependencies": {
    "css-loader": "^0.28.11",
    "extract-text-webpack-plugin": "^4.0.0-beta.0",
    "file-loader": "^1.1.11",
    "style-loader": "^0.21.0",
    "url-loader": "^1.0.1"
}

再次webpack 通過..