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You can download Vue Devtools Extension for Chrome and go to the ‘Events’ tab.
All the events from your components are listed there and probably your QTable events too.
If this doesn’t work you can go to your node_modules component folder and search where it is mounted and create a custom event for your code like this:
mounted(){
this.$root.$emit('CustomEvent', this.customVar || true)
}
Source:stackexchange.com