askirmas / react-classnaming

/**

 * Identical function or returning constant `EMPTY_OBJECT` for keys check of not used classes in components tree

 * @example

 * ```tsx

 *  // Dummies shape

 *  <Component classnames={classNamesCheck()} />;

 * ```

 * ---

 * ```tsx

 * import type { ClassNamesFrom } from "react-classnaming/types"

 * import css_module from "./some.css" // With class `.never-used {...}`

 *

 *  <Component classnames={classNamesCheck(

 *    css_module,

 *    //@ts-expect-error Property 'never-used' is missing

 *    {} as ClassNamesFrom<typeof Component>

 *  )} />;

 * ```

 */

 function classNamesCheck<

  Target extends {[K in keyof Module]: ClassHash},

  Module extends CssModule

>(

  source = EMPTY_OBJECT as Module,

  _ = EMPTY_OBJECT as Target

): string extends keyof Module ? Target : Module {

  //@ts-expect-error

  return source

}