rn-mp-queue-with-promise.js

import {MixpanelInstance} from 'react-native-mixpanel';

class MixpanelStub {
  constructor() {
    this.queue = {track: []};
  }

  track(event, properties) {
    console.log('queuing event for tracking');
    let resolve, reject;
    const promise = new Promise((res, rej) => {
      resolve = res;
      reject = rej;
    })
    this.queue.track.push({args: [event, properties], resolve, reject});
    return promise;
  }
}

const Mixpanel = {
  _instances: {},

  initialize(apiToken) {
    const instance = new MixpanelInstance(apiToken);
    instance.initialize().then(() => {
      this._onInitialized(instance);
    });

    const stub = new MixpanelStub();
    this._instances[apiToken] = stub;
    return stub;
  },

  _onInitialized(instance) {
    const stub = this._instances[instance.apiToken];
    Object.keys(stub.queue).forEach(funcName => {
      stub.queue[funcName].forEach(({args, resolve, reject}) => {
        instance[funcName].call(instance, args)
        console.log(funcName, args);
        resolve();
      });
    });
    Object.assign(stub, instance);
  }
}

const mixpanel = Mixpanel.initialize("6888bfdec29d84ab2d36ae18c57b8535");
mixpanel.track("hello world").then(() => console.log('promise resolved'));

rn-mp-queue.js

class MixpanelStub {
  constructor() {
    this.queue = {track: []};
  }

  track(event, properties) {
    console.log('queuing event for tracking');
    this.queue.track.push({args: [event, properties], promise: new Promise);
  }
}

const Mixpanel = {
  _instances: {},

  initialize(apiToken) {
    const instance = new MixpanelInstance(apiToken);
    instance.initialize().then(() => {
      this._onInitialized(instance);
    });

    const stub = new MixpanelStub();
    this._instances[apiToken] = stub;
    return stub;
  },

  _onInitialized(instance) {
    const stub = this._instances[instance.apiToken];
    Object.keys(stub.queue).forEach(funcName => {
      stub.queue[funcName].forEach(args => {
        instance[funcName].call(instance, args)
        console.log(funcName, args);
      });
    });
    Object.assign(stub, instance);
  }
}

const mixpanel = Mixpanel.initialize("6888bfdec29d84ab2d36ae18c57b8535");
mixpanel.track("hello world");