Accessing/passing down parent state (ReactiveDict) in Blaze

_superstate.js

/**
 * Global helper for applying parent state to current template.
 * Usage:
 * Invoke superstate(this); in a Template.onCreated callback to inherit parent state.
 * @param templateInstance {Object} The current Blaze.View object to pass in.
 * @returns {Object} The state object.
 */
superstate = (templateInstance, stateProp) => {
	// defaults to Template.instance().state
	if (!stateProp) stateProp = 'state';

	// traverse up until Blaze.View is a {{> template}} and not a condition block
	let parent = templateInstance.view.parentView;
	while (parent && !parent.hasOwnProperty('template')) {
		parent = parent.parentView &&
			parent.parentView._templateInstance &&
			parent.parentView._templateInstance[stateProp] ?
			parent.parentView : null;
	}

	// return null if parent doesn't exist
	if (!parent) return null;

	return templateInstance.state = parent._templateInstance[stateProp];
};

example.html

<template name="topLevel">
  <!-- parent template -->
  {{> child}}
</template>

<template name="child">
  <!-- child template -->
</template>

example.js

Template.topLevel.onCreated(function () {
	this.state = new ReactiveDict();
	this.state.set('foo', 'bar');
});

Template.child.onCreated(function () {
	superstate(this);
	console.log(this.state.get('foo')); // bar
});