Template literal types combine literal types with string manipulation for powerful type-level string operations.
Basic Syntax
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String Manipulation Types
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Event Handlers
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CSS Property Types
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Route Parameters
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API Endpoints
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Property Getters/Setters
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Redux Action Types
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Parsing Strings
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Validation Patterns
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Combining with Mapped Types
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Real-World Example
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Best Practices
Pattern Design:
✓ Keep patterns readable
✓ Use meaningful type names
✓ Document complex patterns
✓ Test with edge cases
Performance:
✓ Limit union expansion
✓ Avoid deeply nested inference
✓ Use simpler alternatives when possible
✓ Watch compilation times
Readability:
✓ Break complex types into parts
✓ Use type aliases
✓ Add comments for inference
✓ Consider runtime alternatives
Avoid:
✗ Overly complex patterns
✗ Massive union expansions
✗ Hard-to-debug type errors
✗ Patterns without runtime validation
Conclusion
Template literal types enable powerful string manipulation at the type level. Use them for generating event handlers, CSS utility types, API endpoints, and route parameters. Combine with mapped types and conditional types for sophisticated type transformations. Remember that complex patterns can slow down compilation and produce hard-to-read error messages, so balance type safety with maintainability.