uniapp打包时Module build failed，mini-css-extract-plugin/dist/loader.js，postcss-loader/src/index.js

Module build failed (from ./node_modules/mini-css-extract-plugin/dist/loader.js):  
14:02:57.843 ModuleBuildError: Module build failed (from ./node_modules/postcss-loader/src/index.js):  
14:02:57.847 SyntaxError  
14:02:57.849 (22:1) Unknown word  
14:02:57.852   20 | }  
14:02:57.852   21 |   
14:02:57.855 > 22 | .  
14:02:57.858      | ^  
at Z:\HBuilderX\plugins\uniapp-cli\node_modules\webpack\lib\NormalModule.js:316:20  
14:02:57.863     at Z:\HBuilderX\plugins\uniapp-cli\node_modules\loader-runner\lib\LoaderRunner.js:367:11  
14:02:57.866     at Z:\HBuilderX\plugins\uniapp-cli\node_modules\loader-runner\lib\LoaderRunner.js:233:18  
14:02:57.868     at context.callback (Z:\HBuilderX\plugins\uniapp-cli\node_modules\loader-runner\lib\LoaderRunner.js:111:13)  
14:02:57.870     at Z:\HBuilderX\plugins\uniapp-cli\node_modules\postcss-loader\src\index.js:221:4  
14:02:57.872  ERROR  Build failed with errors.```javascript