00612-medium-kebabcase.ts

// ============= Test Cases =============
import type { Equal, Expect } from './test-utils'

type cases = [
  Expect<Equal<KebabCase<'FooBarBaz'>, 'foo-bar-baz'>>,
  Expect<Equal<KebabCase<'fooBarBaz'>, 'foo-bar-baz'>>,
  Expect<Equal<KebabCase<'foo-bar'>, 'foo-bar'>>,
  Expect<Equal<KebabCase<'foo_bar'>, 'foo_bar'>>,
  Expect<Equal<KebabCase<'Foo-Bar'>, 'foo--bar'>>,
  Expect<Equal<KebabCase<'ABC'>, 'a-b-c'>>,
  Expect<Equal<KebabCase<'-'>, '-'>>,
  Expect<Equal<KebabCase<''>, ''>>,
  Expect<Equal<KebabCase<'😎'>, '😎'>>,
]


// ============= Your Code Here =============
type KebabCase<S extends string> = S extends `${infer R}${infer Rest}`
  ? Rest extends Uncapitalize<Rest>
    ? `${Lowercase<R>}${KebabCase<Rest>}`
    : `${Lowercase<R>}-${KebabCase<Rest>}`
  : S;

type test1 = Uncapitalize<"HelloWorld123HERE">