Template literal types combine literal types with string interpolation. Here's how to use them.
Basic Syntax
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Event Naming
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String Manipulation Types
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Getter and Setter Types
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Route Patterns
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CSS Class Utilities
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Database Column Types
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Pattern Matching
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Action Types (Redux-style)
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Environment Variables
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Best Practices
Patterns:
✓ Use for event handler names
✓ Generate accessor methods
✓ Type API routes
✓ CSS utility types
String Manipulation:
✓ Uppercase/Lowercase for conventions
✓ Capitalize for camelCase
✓ Combine with key remapping
✓ Pattern matching with infer
Performance:
✓ Limit union combinations
✓ Avoid deep recursion
✓ Cache complex types
✓ Use type aliases
Avoid:
✗ Extremely large unions
✗ Complex nested templates
✗ Runtime string building
✗ Over-engineering simple cases
Conclusion
Template literal types enable powerful string manipulation at the type level. Use them for event naming conventions, accessor generation, route typing, and CSS utilities. Combine with Uppercase, Lowercase, and Capitalize for consistent naming. Be mindful of union explosion when combining multiple union types in templates.