eslint: disable warning - `defined but never used` for specific function?

Provide a config comment telling it to ignore that rule (defined but never used is the no-unused-vars rule)

function render() { // eslint-disable-line no-unused-vars
    // do stuff
    var x; // still raises defined but never used
}

If you dont want to change the code.

ESLint provides both a way to disable, both to enable the linting via comments. You only added before functions /* eslint-disable */ and after functions /* eslint-enable */

Example

/* eslint-disable */ <-- Before function

function render(){
   // do stuff
}

/* eslint-enable */  <-- After function

More info