TypeError: Cannot read property 'javascript' of undefined + terser webpack plugin + react js

Hi you are using Webpack 4 and Terser ^5.0.0. This version of Terser is for Webpack 5, you need to set version "terser-webpack-plugin": "^4.2.3", in package.json file

您正在使用Webpack 4和精简版^5.0.0。此版本的Terser适用于网页包5，您需要在软件包中设置版本“terser webpack plugin”：“^4.2.3”json文件