Lightning Components Developer Guide

What is the Lightning Component Framework?
Quick Start
Creating Components
Using Components
Lightning Component Bundle Design Resources
Use Lightning Components in Lightning Experience and the Salesforce Mobile App
Navigation in Lightning Experience and the Salesforce Mobile App Using Page References
Get Your Lightning Components Ready to Use on Lightning Pages
Use Lightning Components in Community Builder
Use Lightning Components with Flows
Considerations for Configuring Components for Flows
Flow Screen Components vs. Flow Action Components
Which Aura Attribute Types Are Supported in Flows?
Design Attribute Considerations for Flow Screen and Action Components
Runtime Considerations for Flows That Include Lightning Components
Customize Flow Screens Using Lightning Components
Create Flow Local Actions Using Lightning Components
Embed a Flow in a Custom Lightning Component
Display Flow Stages with a Lightning Component
Add Components to Apps
Integrate Your Custom Apps into the Chatter Publisher
Using Background Utility Items
Use Lightning Components in Visualforce Pages
Add Lightning Components to Any App with Lightning Out (Beta)
Lightning Container
Communicating with Events
Creating Apps
Styling Apps
Developing Secure Code
Using JavaScript
Using Apex
Lightning Data Service
Testing Components with Lightning Testing Service
Debugging
Performance
Reference
PDF

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Design Attribute Considerations for Flow Screen and Action Components

To expose an attribute in the Cloud Flow Designer, define a corresponding design:attribute in the component bundle's design resource. Keep these guidelines in mind when defining design attributes for flows.
Supported Attributes on design:attribute Nodes
In a design:attribute node, the Cloud Flow Designer supports only the name, label, and description attributes. The other attributes, like min and max, are ignored.

For example, for this design attribute definition, the Cloud Flow Designer ignores required and placeholder. 

1<design:attributename="greeting" label="Greeting" placeholder="Hello" required="true"/>
Calculating Minimum and Maximum Values for an Attribute
To validate min and max lengths for a component attribute, use a flow formula or the component's client-side controller.
Modifying or Deleting design:attribute Nodes
If a component’s attribute is referenced in a flow, you can’t change the attribute’s type or remove it from the design resource. This limitation applies to all flow versions, not just active ones. Remove references to the attribute in all flow versions, and then edit or delete the attribute in the design resource.