CamelToDash

index.ts

export type CamelToDash<
  S extends string,
  H = true
> = S extends `${infer S1}${infer S2}`
  ? S1 extends Uppercase<S1>
    ? H extends true
      ? `${Lowercase<S1>}${CamelToDash<S2, false>}`
      : `-${Lowercase<S1>}${CamelToDash<S2, false>}`
    : `${S1}${CamelToDash<S2, false>}`
  : S;

export function camelToDash<T extends string>(str: T): CamelToDash<T> {
  return Array.from(str)
    .map((str, index) => {
      let code = str.charCodeAt(0);

      //         'A'           'Z'
      if (code >= 65 || code <= 90) {
        return index ? `-${str.toLowerCase()}` : str.toLowerCase();
      }

      return str;
    })
    .join('') as CamelToDash<T>;
}