Salesforce DX Developer Guide

How Salesforce Developer Experience Changes the Way You Work
Enable Dev Hub Features in Your Org
Project Setup
Authorization
Metadata Coverage
Scratch Orgs
Sandboxes
Development
Build and Release Your App
First-Generation Managed Packages
Second-Generation Managed Packages
Unlocked Packages
What’s a Package
Package-Based Development Model
Before You Create Unlocked Packages
Know Your Orgs
Create Org-Dependent Unlocked Packages (Beta)
Workflow for Unlocked Packages
Configure Packages
Project Configuration File for Packages
Keywords
Package Installation Key
Extract Dependency Information from Unlocked Packages
Understanding Namespaces
Create and Register Your Namespace
Avoid Namespace Collisions
Namespace-Based Visibility for Apex Classes in Unlocked Packages
Share Release Notes and Post-Install Instructions
Best Practices for Unlocked Packages
Package IDs and Aliases
Frequently Used Packaging Operations
Create a Package
Push a Package Upgrade (Beta)
Install a Package
Migrate Deprecated Metadata from Unlocked Packages
Uninstall a Package
Continuous Integration
Troubleshoot Salesforce DX
Limitations for Salesforce DX
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Create and Register Your Namespace

With unlocked packages, you can share a single namespace with multiple packages. Since sharing of code is much easier if your package shares the same namespace, we recommend that if use namepaces, you use a single namespace for your namespaced unlocked packages.
To create a namespace:
  1. Sign up for a new Developer Edition org.
  2. In Setup, enter Package Manager in the Quick Find box, and select Package Manager.
  3. In Developer Settings, click Edit, and under Change Developer Settings, click Continue.
  4. In Namespace Prefix enter a namespace, and select Check Availability.
  5. For Package to be managed, select None, then click Review My Selections.
  6. Review your selections, and then click Save.
To register a namespace:
  1. To link the namespace that you created with your Dev Hub, use Namespace Registry. See Link a Namespace to a Dev Hub for details.
  2. In the sfdx-project.json file, specify your namespace using the namespace attribute. When you create a new unlocked package, the package is associated with the namespace specified in the sfdx-project.json file.