Prompt

Share code between web and mobile apps.

<existing_code>
{web and mobile codebases}
</existing_code>

<sharing_candidates>
{business logic, utilities}
</sharing_candidates>

<platform_differences>
{APIs, UI frameworks}
</platform_differences>

Share:
1. Shared package structure
2. Platform abstraction
3. Build configuration
4. Testing strategy
5. Deployment approach
6. Maintenance plan