@gleaner/tracker/src/index.js

A JavaScript tracking library with ecommerce support

// TODO: cleanup
// import "babel-polyfill";

import isFunction from 'lodash.isfunction';
import Gleaner from './gleaner';
import { createInstance } from './utils';

/*
	Asynchronously Points the queue from bootstraped instance to an actual Gleaner.
	@param {Function}
	@param {String}
	@param {Object}
*/
function asyncReplaceInstance(instance, name, config) {
	new Gleaner(name, config, (g) => {
		if (instance.queue.length) {
			// gather tracked events
			let [_, ...events] = instance.queue;
			// and manually call the track methods
			events.forEach((e) => g.builder.push(e));
		}

		// point the array loging to working builder
		instance.queue = g.builder;

		if (isFunction(config.onLoad)) {
			config.onLoad(g);
		}
	});
}


/*
	Initializes bootstraped instance.
	@param {Function} bootstraped global function
*/
export function initBootstraped(instance) {
	if (isFunction(instance) && instance.queue) {
		let { name, queue } = instance;
		
		// peek at first command
		let [[method, config]] = queue;

		if (method === "init") {
			// create actual instance
			asyncReplaceInstance(instance, name, config);
		}
		else {
			throw Error("Gleaner: must be initialized with init method.");			
		}
	}
	else {
		throw Error("Gleaner.init expects function created with boostrap script.");			
	}
}

/*
	Default exported initializer function for common import/require scenario.
	@param {String}
	@param {Object}
*/
export default function initImported(name, config) {
	let instance = createInstance();
	asyncReplaceInstance(instance, name, config);
	return instance;
}

/*
	Otherwise when not importing (using bootstrap script)
	this runs and creates instances for the gleaners.
*/
if (window.GleanerInstances) {
	let name = GleanerInstances.shift(); // TODO: Multiple instances
	let instance = window[name];
	initBootstraped(instance);
}