This article explores template literal types in TypeScript, which, while syntactically similar to JavaScript's template literals, function at the type level. The piece covers their utility for static syntax checking of string literals, transforming property name casing, and creating extensive string literal union types. The discussion includes basic syntax, utility types, and practical applications, underscoring the ability of template literal types to concatenate strings and the implications of using union types in complex scenarios.
Beware that the cross product distribution of union types can quickly become unwieldy, resulting in an explosion of types that can complicate code management.
Template literal types not only provide static syntax checking for string literals but also enable powerful string manipulation and the specification of complex union types.
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