/**
 * Changes the casing of a string to constant case.
 * e.g. `"fooBar"` -> `"FOO_BAR"` or `"foo bar"` -> `"FOO_BAR"` or `"foo-bar"` -> `"FOO_BAR"`
 */
declare function constantCase<S extends string>(string: S): ConstantCase<S>;
type ConstantCase<S extends string> = Uppercase<S extends `${infer S1}${infer S2}` ? `${S1 extends '-' ? '_' : S1 extends ' ' ? '_' : S1 extends '_' ? '_' : S1 extends Capitalize<S1> ? `_${Lowercase<S1>}` : S1}${ConstantCase<S2>}` : S>;

export { ConstantCase as C, constantCase as c };