Memory leak via drake events not being unsubscribed

[maximcoding]

Please add documentation to prevent memory leak (Angular 7 Component never destroyed thats listens to drake events like drake.on('cancel') , drake.on('drop') and etc.. ) . Using version ng2-dragula: "1.5.0" - and can't upgrade ( in new version of Dragula implementation has been changed ) and should be done hard refactor to my project . Fixed the problem with :

ngOnDestroy(): void { this.drake.off('over'); this.drake.off('out'); this.drake.off('drag'); this.drake.off('drop'); this.drake.off('remove'); this.drake.off('cancel'); }
}

How to reproduce the memory leak:

1. add drake.on('remove') in the Component
2. Open component few times .
3. Take memory snapshot in chrome .
4. See few instances of your Component .

[cormacrelf]

Not a documentation issue. This is a regular bug that should be fixed. Thanks.