Function resolveAtReference

packages/shared/at-reference.ts:44–52

(
  input: string,
  exists: (candidate: string) => boolean,
)

 * predicates. The helper itself is filesystem-agnostic.
 */
export function resolveAtReference(
  input: string,
  exists: (candidate: string) => boolean,
): string | null {
  const stripped = stripAtPrefix(input);
  if (exists(stripped)) return stripped;
  if (stripped !== input && exists(input)) return input;
  return null;
}