We do see all errors and warnings in the "problems" tab when we open a Typescript file with errors, but they are removed from the problems tab when we close the file. It would be great to be able to see all the problems of all the files in a project.

This was requested to be globally implemented in the vscode issue at microsoft/vscode#13953 but we were told that this is not something to be implemented globally, but per language/plugin.

I do understand not everyone would like to have this feature, or that it would be useful just for some cases or projects., specially because it would consume too many resources. A way to turn this feature on/off per project would help the user when to turn it on/off.