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TypeScript Advanced Patterns
Advanced TypeScript: discriminated unions, template literals, type inference, and real-world patterns.
Time
Compile-time only
Space
Zero runtime overhead
🧠Mental Model
“Type-level programming - write code that validates your other code at compile time.”
Verbal cue: Make impossible states impossible.
🎯Recognition Triggers
When you see these patterns in a problem, consider this approach:
advanced TypeScriptdiscriminated unionstemplate literalstype inference
💡Interview Tips
- 1Discriminated unions are incredibly powerful - show you know them
- 2Mention how types help with refactoring at scale
- 3Know when to use as const for literal types
⚠️Common Mistakes
- ✕Overcomplicating types when simpler solutions exist
- ✕Not using discriminated unions for state management
- ✕Fighting the type system instead of working with it