template-literal-types

TypeScript template literal types validate string patterns at compile time by defining constraints like `data-${string}`. This enforces correct string shapes and transformations before runtime, ensuring safer APIs and DSL parsing without adding runtime overhead.

Parsing DSL strings with TypeScript involves using template literal types alongside conditional types and the `infer` keyword. This combination extracts and transforms specific string segments at compile time, enabling type-safe DSL validation directly within your frontend or library codebase.

TypeScript supports type-level string transformations for API design through template literal types and mapped types. You can model structured string patterns such as URLs and paths, constraining related types to ensure string transformations remain type-safe during development.

Mapped types transform string shapes in TypeScript by applying template literal types to existing structures. This allows you to parse, validate, and remap string patterns at compile time, resulting in safer APIs and more robust string handling in library code.

Template literal types require TypeScript version 4.1 or higher. This version introduced the ability to model string patterns, use conditional types, and apply the `infer` keyword to parse and transform strings at the type level.

Compile-time string validation with template literal types catches pattern mismatches during development rather than at runtime. By modeling structured strings like IDs and paths type-level, you eliminate runtime validation overhead and enforce stricter API safety.