Vulcan/packages/vulcan-events/lib/modules/events.js

import { addCallback } from 'meteor/vulcan:core';

export const initFunctions = [];

export const trackFunctions = [];

export const addInitFunction = f => {
  initFunctions.push(f);
  // execute init function as soon as possible
  f();
};

export const addTrackFunction = f => {
  trackFunctions.push(f);
};

export const track = async (eventName, eventProperties, currentUser) => {
  for (let f of trackFunctions) {
    try {
      await f(eventName, eventProperties, currentUser);
    } catch (error) {
      // eslint-disable-next-line no-console
      console.log(`// ${f.name} track error`);
      // eslint-disable-next-line no-console
      console.log(error);
    }
  }
};

export const addUserFunction = f => {
  addCallback('users.new.async', f);
};

export const addIdentifyFunction = f => {
  addCallback('events.identify', f);
};

export const addPageFunction = f => {
  const f2 = (empty, route) => f(route);

  // rename f2 to same name as f
  // see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty
  const descriptor = Object.create(null); // no inherited properties
  descriptor.value = f.name;
  Object.defineProperty(f2, 'name', descriptor);

  addCallback('router.onUpdate', f2);
};