The original title is: "TypeScript Template Literal Types: Advanced Patterns for String-Safe APIs"

Short summary

Template literal types in TypeScript enable compile-time validation of string-based APIs by encoding patterns directly in the type system, catching invalid routes, queries, and parameters before code runs. Recursive types validate complex nested paths, and built-in utilities (Uppercase, Lowercase, Capitalize) eliminate manual transformation boilerplate. Real-world applications range from type-safe route handlers to event emitters and CSS validation, scaling to hundreds of routes without maintenance overhead.

• •Template literal types catch invalid string formats at compile time instead of runtime
• •Recursive types validate nested paths like users/:id/posts/:postId without enumerating all combinations
• •TypeScript built-in utilities (Uppercase, Lowercase, Capitalize) transform types without helper functions

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