Catch String Bugs Before Runtime: TypeScript's Template Literal Types

String pattern violations are a leading source of runtime bugs in TypeScript applications, yet most developers rely on runtime validation or luck to catch them. Template Literal Types enable compile-time enforcement of string formats—such as CSS units, URL structures, and HTML attributes—without validation libraries or runtime overhead. This feature shifts error detection from production to the editor, fundamentally improving code reliability for anyone building type-safe systems.