将Angular-Cli从1.7.4版本升级到Angular 8项目中的最新版本9

Question

使用以下命令升级cli后：

npm install --save-dev @angular/cli@latest

ng update @angular/cli --from=1.7.4 
--migrate-only --allow-dirty (to convert the angular-cli.json to angular.json)

我遇到以下错误：

ERROR in ./app/assets/less/bootstrap/input-groups.less (./node_modules/css-loader?{"sourceMap":true,"minimize":false}!./node_modules/less-loader/dist/cjs.js?{"sourceMap":true,"modifyVars":{"root":"/"~@angular/../../"","styles":"/"~@angular/../../app/assets/less
/""}}!./app/assets/less/bootstrap/input-groups.less)
Module build failed (from ./node_modules/less-loader/dist/cjs.js)

有什么主意吗？

Answer 1

也许尝试升级角度/核心？

ng update @angular/core