owtlab-tracking/lib/extend-events.js

A simple Tracking system

import { deepExtend } from './utils/deepExtend';
import each from './core/utils/each';


export function extendEvent(eventCollection, eventModifier) {
  if (
    arguments.length !== 2 ||
    typeof eventCollection !== 'string' ||
    (typeof eventModifier !== 'object' && typeof eventModifier !== 'function')
  ) {
    handleValidationError.call(
      this,
      'Incorrect arguments provided to #extendEvent method',
    );
    return;
  }
  this.extensions.collections[eventCollection] =
    this.extensions.collections[eventCollection] || [];
  this.extensions.collections[eventCollection].push(eventModifier);

  this.emit('extendEvent', eventCollection, eventModifier);
  return this;
}

export function extendEvents(eventsModifier) {
  if (
    arguments.length !== 1 ||
    (typeof eventsModifier !== 'object' && typeof eventsModifier !== 'function')
  ) {
    handleValidationError.call(
      this,
      'Incorrect arguments provided to #extendEvents method',
    );
    return;
  }

  this.extensions.events.push(eventsModifier);
  this.emit('extendEvents', eventsModifier);
  return this;
}

function handleValidationError(message) {
  this.emit('error', `Event(s) not extended: ${message}`);
}

export function getExtendedEventBody(result, queue) {
  if (queue && queue.length > 0) {
    each(queue, (eventModifier, i) => {
      const modifierResult =
        typeof eventModifier === 'function' ? eventModifier() : eventModifier;
      deepExtend(result, modifierResult);
    });
  }

  return result;
}