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Configure Components for Flow Screens
Make your custom Lightning components available to flow screens in the Cloud Flow
Designer by implementing the lightning:availableForFlowScreens interface.
Here’s the sample code for a simple “Hello World” component.
Next, add a design resource to your component bundle. A design resource describes the design-time behavior of a Lightning component—information that visual tools need to allow adding the component to a page or app. It contains attributes that are available for admins to edit in the Cloud Flow Designer.
Adding this resource is similar to adding it for the Lightning App Builder.