lesson-rust install routing error module language translate material animation guard ngtest jasmine karma protractor e2e input ngonchange subject observable rxjs subscribe subscription unsubscribe resolve component pwa maintenance offline interface enum update lazyloading document compodoc form formgroup initializer factory formcontrol custom validation library package ssr seo universal platform location svg webworker viewchild console time sparkline chart directive nvd3 ng2-nvd3 import types definition typescript query heroku deploy replace yield electron storage window match ngfor trackby bubbling changedetection ngzone xsrf csrf protection ssg scully ngx-translate rehydrate ngif decorator debounce throttle dynamic ngcomponentoutlet createcomponent tooltip modal keyvalue pipe class getter setter chrome tool nullish coalescing operator websocket json highcharts domaanitizer unload beforeunload routeroutlet provider useexisting useclass instanceof typeof keyof in casting ngdoc contextmenu standalone webcomponent template nativefederation manifest maints inject ondestroy afterrender afternextrender keycloak module-federation signal controlflow nodejs githubmodels gpt async github controlvalueaccessor forms reactiveforms