From microsoft/vscode-languageserver-node#39
Steps:
- install eslint or tslint
- enable tracing via the setting:
"eslint.trace.server":"messages"
or
"tslint.trace.server":"messages"
- open output window and switch to the tslint / eslint channel
- open a ts / js file and ensure that the communication between client and server is logged.
- change the setting to: "verbose"
- ensure that you get a verbose log
- change the setting to "off"
- ensure that tracing stops.