My gist

action_and_store_sample.js

// Omitted export stuff, this is just to pass the ideia of what i'm trying to accomplish

class MyAction {
  async updateParticipants() {
    const response = await axios.get("some/url/participants");
    return response.data;
  }
}

class MyStore {
 constructor() {
   this.bindActions(MyAction);
   
   this.participants = [];
 }
  
  // This isn't being called when updateParticipants action finishes...
  onUpdateParticipants(participants) {
    this.participants = participants;
  }
}