First-Generation Managed Packaging Developer Guide

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First-Generation Managed Packages
Why Switch to Second-Generation Managed Packaging?
Move to 2GP: Migrate Your Managed Packages with Ease
About Package Conversion and Package Migration
Three Phases of Package Migration Development
Plan Your Package Migration
Before You Begin Package Migrations
Convert Your Managed 1GP Package to 2GP
View Details about Your Converted 2GP Package
Specify Dependencies on Unpackageable Metadata
Test Your Converted Managed 2GP Package
Migrate Your Subscribers from 1GP to 2GP
Considerations for Package Migrations
Troubleshoot Package Conversion Failures
Register a Namespace for a First-Generation Managed Package
Create a First-Generation Managed Package Using a UI
Create a First-Generation Managed Package using Salesforce DX
Components Available in First-Generation Managed Packages
Behavior of Specific Metadata in First-Generation Managed Packages
Package and Test Your First-Generation Managed Package
Update Your First-Generation Managed Package
Publish Upgrades to First-Generation Managed Packages
Manage Licenses for Managed Packages
Manage Features in First-Generation Managed Packages
AppExchange App Analytics for First-Generation Managed Packages
Developing and Distributing Unmanaged Packages
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Specify Dependencies on Unpackageable Metadata

It’s possible that the managed 1GP package you’re converting includes tests or references to unpackageable metadata.

To ensure your package conversion is successful, references to unpackageable metadata must be specified in your project configuration file. If you followed the steps in Convert Your Managed 1GP Package to 2GP, you created a Salesforce DX project in step three. When you create a Salesforce DX project, the project configuration file (sfdx-project.json) is automatically created.

If you think you may have these kinds of references, review Specify Unpackaged Metadata for Package Version Creation Tests and Reference Standard Value Sets by Specifying a Seed Metadata Directory. In Migrating Your Subscribers from 1GP to 2GP, we share when in the conversion workflow to specify unpackageable metadata.