ey => $src_url ) {
			// Skip if the src doesn't start with the placeholder, as there's nothing to replace.
			if ( ! str_starts_with( $src_url, $placeholder ) ) {
				continue;
			}

			$src_file        = str_replace( $placeholder, '', $src_url );
			$src[ $src_key ] = get_theme_file_uri( $src_file );
		}

		return $src;
	}

	/**
	 * Converts all first dimension keys into kebab-case.
	 *
	 * @since 6.4.0
	 *
	 * @param array $data The array to process.
	 * @return array Data with first dimension keys converted into kebab-case.
	 */
	private static function to_kebab_case( array $data ) {
		foreach ( $data as $key => $value ) {
			$kebab_case          = _wp_to_kebab_case( $key );
			$data[ $kebab_case ] = $value;
			if ( $kebab_case !== $key ) {
				unset( $data[ $key ] );
			}
		}

		return $data;
	}
}