On

Execute events registered with @on in the same script context as the current principal.

const { on } = require('decorators')

class Handler {

  @on('axon__task.completed', { name: 'axon__task_completed_event' })
  onCompleted( task, str ) {
    // str === "another param"
  }

}

const task = completeATask()
script.fire('axon__task.completed', task, "another param")