嘗試 v10 rc 的時候, 突然 language service 不 work 了.
ctrl + shift + p -> Show logs...
這樣可以檢查和 report issue

然后這里有教怎樣安裝 pre release 的 language service, 要手動下載和安裝
下載地址是 :
https://github.com/angular/vscode-ng-language-service/releases
https://github.com/angular/vscode-ng-language-service/issues/793
https://github.com/angular/vscode-ng-language-service#installing-a-particular-release-build (安裝方式)

step 1: download

step 2: 安裝

