In componentWillMount, I add an event listener to Wallop.

this.wallop = new Wallop(document.querySelector('.Wallop'));
this.wallop.on('change', this.handleWallopChange);

In componentWillUnmount, I want to remove the listener

this.wallop.$selector.removeEventListener('change', this.handleWallopChange);

This doesn't work since Wallop's implementation of on uses an anonymous function. Is it possible to use the callback event instead and perhaps add an off method? Thanks.