Salesforce DX Developer Guide
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Generate the Package
When you’re ready to test or share your package, use the force:package:create command to create a package.
If you are using a namespace, specify the package namespace in the sfdx-project.json file. To learn more, see Understanding Namespaces.
To create the package, change to the project directory. The name becomes the package alias, which is automatically added to the project file. You can choose to designate an active Dev Hub org user to receive email notifications for Apex gacks, and install, upgrade, or uninstall failures associated with your packages.
The output is similar to this example.
Update the Package
To update the name, description, or the user to receive error notifications of an
existing package, use this
command.