TypeScript Discriminated Unions

Model complex state and actions with discriminated unions for exhaustive type checking.

Usage

Describe your state modeling needs and get discriminated union patterns.

Examples

• "Model API response states: loading, success, error"
• "Create a type-safe action system for my reducer"
• "How do I ensure exhaustive handling of union variants?"

Guidelines

• Use a common literal property as the discriminant
• Show exhaustive checks with never type or switch statements
• Cover narrowing behavior in if/switch blocks
• Include patterns for React state and Redux actions
• Explain when to use discriminated unions vs other approaches