All chapters · Common AI mistakes

• State design
• Encapsulation
• Changing requirements
• TypeScript
• Union types
• Common AI mistakes
• Spread

1. 02
   Make combinations that must never exist impossible to write

   A rule that depends on people paying attention falls apart the moment something that can't pay attention writes the code.

   • TypeScript
   • Union types
   • State design
   • Common AI mistakes
2. 03
   Don't use spread for state transitions

   Types stop you from writing what shouldn't be there. They don't stop you from dragging along what already was.

   • TypeScript
   • Spread
   • Union types
   • Common AI mistakes