原因:

出现错误是由于babel的版本冲,有两种解决方式:

(1). babel-loader 8.x | babel 7.x (升级版本)

npm install -D babel-loader @babel/core @babel/preset-env webpack

(2). babel-loader 7.x | babel 6.x (降级版本)

npm install -D babel-loader@7 babel-core babel-preset-env webpack

解决方法:
(1).升级版本,执行命令:

npm install -D babel-loader @babel/core @babel/preset-env @babel/preset-react webpack

相关配置将会更新到最新

“@babel/core”: “^7.7.4”,
“@babel/preset-env”: “^7.7.4”,
“@babel/preset-react”: “^7.7.4”,
“babel-loader”: “^8.0.6”,

babel配置修改为:

presets: [
“@babel/env”, “@babel/react”
]

(2).降级版本,执行命令

npm install -D babel-loader@7 babel-core babel-preset-env babel-preset-react webpack

相关配置降级到6.0版本

“babel-core”: “^6.26.3”,

“babel-preset-env”: “^1.7.0”,

“babel-preset-react”: “^6.24.1”,

“babel-loader”: “^7.1.5”,

babel配置修改为 ;

presets: [
“env”,“react”
]