CleanWebpackPlugin is not a constructor 安裝clean-webpack-plugin報錯

使用插件 clean-webpack-plugin 時候報錯 CleanWebpackPlugin is not a constructor

1. 注意引用插件版本問題，版本太高也不行，“clean-webpack-plugin”: “^2.0.2”
2. 大小寫問題 開頭C要大寫，養成習慣插件開頭大寫，變量開頭小寫
3. CleanWebpackPlugin 參數問題，new CleanWebpackPlugin()，這裏不需要傳目錄參數，傳上就報錯

正確寫法如下

const CleanWebpackPlugin = require("clean-webpack-plugin");

plugins: [
    new CleanWebpackPlugin()
  ]