declare global {
  interface Array<T> {
    /**
     * The first element of the array.
     *
     * @example
     * ```typescript
     * const arr = [1, 2, 3];
     * arr.first; // => 1
     * ```
     */
    first: any[] extends this ? T | undefined : T;
  }
  interface ReadonlyArray<T> {
    /**
     * The first element of the array.
     *
     * @example
     * ```typescript
     * const arr = [1, 2, 3];
     * arr.first; // => 1
     * ```
     */
    first: T | undefined;
  }
}
export {};
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