我刚刚将我的Angular 5项目升级到6.并且构建失败了：
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ERROR in node_modules/@ng-bootstrap/ng-bootstrap/datepicker/datepicker-service.d.ts(5,10): error TS2305: Module ‘”C:/myapp/node_modules/rxjs/Observable”‘ has no exported member ‘Observable’.node_modules/@ng-bootstrap/ng-bootstrap/typeahead/typeahead.d.ts(3,10): error TS2305: Module ‘”C:/myapp/node_modules/rxjs/Observable”‘ has no exported member ‘Observable’.node_modules/rxjs/Observable.d.ts(1,15): error TS2307: Cannot find module ‘rxjs-compat/Observable’.@H_404_8@
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