Description
The tslint language server plugin has to handle the situation that a tslint.json file cannot be read. The tslint API to get the configuration returns an exception in this case. There needs to be a way to show the exception to the user. The VS Code tslint extension shows this exception in the tslint output channel, see the screenshot below.
A plugin has access to the TS logger info.project.projectService.logger, but this log is intended for plugin authors to trace the execution of a plugin. It is not intended to be shown and understood by the end user.
What would be needed is an API that allows a plugin to send a log message event under a particular topic to the language server client. A client like VS Code can then append this message to a plugin specific output channel, in this case to the tslint channel.
// fyi @mjbvz