Lightning Aura Components Developer Guide

What Is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Communicating with Events
Communicating Across the DOM with Lightning Message Service (Developer Preview)
Create a Message Channel
Publish on a Message Channel
Subscribe to a Message Channel
Considerations and Limitations
Creating Apps
Styling Apps
Developing Secure Code
Using JavaScript
Working with Salesforce Data
Testing Components with Lightning Testing Service
Debugging
Performance
Reference
PDF

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Considerations and Limitations

Keep the following in mind when working with the lightning:messageChannel component. 

Lightning Message Service publishes messages to any subscribed component until the destroy phase of the component's lifecycle, even if the component isn't visible. Sometimes when you navigate away from a Lightning page, components are cached and not destroyed. These components still receive messages published on the Lightning Message Service. For more information, read about the Lightning component lifecycle and related system events.

Limitations
Do not include a Lightning message channel in a package that you plan to install into production orgs. The installation will fail.
The Lightning Message Service API doesn’t support the following experiences during Developer Preview:
  • Salesforce mobile app
  • Lightning Out