TypeScript Template Literal Types

Template literal types combine literal types with string interpolation. Here's how to use them.

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

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.

TypeScript Template Literal Types

Basic Syntax#

Event Naming#

String Manipulation Types#

Getter and Setter Types#

Route Patterns#

CSS Class Utilities#

Database Column Types#

Pattern Matching#

Action Types (Redux-style)#

Environment Variables#

Best Practices#

Conclusion#

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