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
Track Changes Between Your Project and Org
Development
Build and Release Your App
First-Generation Managed Packages
Second-Generation Managed Packages
Partner Licensing Platform (Developer Preview)
Unlocked Packages
What’s a Package
Package-Based Development Model
Before You Create Unlocked Packages
Know Your Orgs
Create Org-Dependent Unlocked Packages
Workflow for Unlocked Packages
Configure Packages
How We Handle Profile Settings in Unlocked Packages
Create a Package
Generate the Package
Generate a Package Version
Code Coverage for Unlocked Packages
Release an Unlocked Package
Update a Package Version
Hard-Deleted Components in Unlocked Packages
Delete an Unlocked Package or Package Version
View Package Details
Push a Package Upgrade
Install a Package
Migrate Deprecated Metadata from Unlocked Packages
Uninstall a Package
Transfer an Unlocked Package to a Different Dev Hub (Beta)
Continuous Integration
Troubleshoot Salesforce DX
Limitations for Salesforce DX
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Create a Package

A package is a top-level container that holds important details about the app or package: the package name, description, and associated namespace.

You supply the package details in the package descriptor section of your sfdx-project.json project configuration file.