Lowercase<S>
Converts each character in the string literal type S to lowercase.
Syntax
Lowercase<StringType>Returns
string literal type — A string literal type with every character lowercased.
Examples
type Quiet = Lowercase<'HELLO'>; // 'hello'
type Normalize<T extends string> = Lowercase<T>;
type Slug = Normalize<'About-Us'>; // 'about-us'
Notes
An intrinsic compiler type that distributes over unions and template literal
types. It only transforms types and produces no runtime code.