Davide,
Sorry that you are seeing this issue.
Are you seeing the warning in a TypeScript file or a JS file?
I see the problem in a JS file at my end and unfortunately there is no way to disable/turn off the said warning message. I have raised a bug for the dev team to fix it. We will keep you posted when the fix is out.
Apologies for inconvenience caused.
–Swapna
MyEclipse Support