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【NodeJS】Angular Compiler Error (seems to be the wrong instance)

NodeJS前端编译报错

ERROR in ./src/main.ts Module build failed: Error: Angular Compiler was detected but it was an instance of the wrong class. This likely means you have several @ngtools/webpack packages installed. You can check this with `npm ls @ngtools/webpack`, and then remove the extra copies. at Object.ngcLoader (/opt/XXX/node_modules/@ngtools/webpack/src/loader.js:458:19) ERROR in ./src/polyfills.ts Module build failed: Error: Angular Compiler was detected but it was an instance of the wrong class. This likely means you have several @ngtools/webpack packages installed. You can check this with `npm ls @ngtools/webpack`, and then remove the extra copies. at Object.ngcLoader (/opt/XXX/node_modules/@ngtools/webpack/src/loader.js:458:19) npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! frontend@0.0.0 prod: `ng build --prod --aot` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the frontend@0.0.0 prod script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above. npm ERR! A complete log of this run can be found in: npm ERR! /root/.npm/_logs/2018-04-06T06_25_00_960Z-debug.log





解决方案：

1. 删除package-lock.json和node_modules文件夹
2. 重新跑npm install

圆满解决。这只是其中一种情况，根据错误提示里的查看@ngtools/webpack是否有多个版本也是一个常识。




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