The following attempts do not work:
/* tslint:disable:"no-unused-variable" */ /* tslint:disable:'no-unused-variable' */ /* tslint:disable:no-unused-variable */

Perhaps Webstorm has other linting mechanisms running in the background? How to disable them, so only tslint is active?
EDIT: the desired solution would be to do this at the source code level without configuring any IDE parameters.
webstorm typescript rule
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