public static function input_fields() {
		if ( empty( self::$input_fields ) ) {
			$input_fields = [
				'postId'      => [
					'type'        => Types::int(),
					'description' => __( 'The ID of the post the comment belongs to.', 'wp-graphql' ),
				],
				'userId'      => [
					'type'        => Types::int(),
					'description' => __( 'The userID of the comment\'s author.', 'wp-graphql' ),
				],
				'author'      => [
					'type'        => Types::string(),
					'description' => __( 'The name of the comment\'s author.', 'wp-graphql' ),
				],
				'authorEmail' => [
					'type'        => Types::string(),
					'description' => __( 'The email of the comment\'s author.', 'wp-graphql' ),
				],
				'authorUrl'   => [
					'type'        => Types::string(),
					'description' => __( 'The url of the comment\'s author.', 'wp-graphql' ),
				],
				'authorIp'    => [
					'type'        => Types::string(),
					'description' => __( 'IP address for the comment\'s author.', 'wp-graphql' ),
				],
				'content'     => [
					'type'        => Types::string(),
					'description' => __( 'Content of the comment.', 'wp-graphql' ),
				],
				'type'        => [
					'type'        => Types::string(),
					'description' => __( 'Type of comment.', 'wp-graphql' ),
				],
				'parent'      => [
					'type'        => Types::id(),
					'description' => __( 'Parent comment of current comment.', 'wp-graphql' ),
				],
				'agent'       => [
					'type'        => Types::string(),
					'description' => __( 'User agent used to post the comment.', 'wp-graphql' ),
				],
				'date'        => [
					'type'        => Types::string(),
					'description' => __( 'The date of the object. Preferable to enter as year/month/day ( e.g. 01/31/2017 ) as it will rearrange date as fit if it is not specified. Incomplete dates may have unintended results for example, "2017" as the input will use current date with timestamp 20:17 ', 'wp-graphql' ),
				],
				'approved'    => [
					'type'        => Types::string(),
					'description' => __( 'The approval status of the comment.', 'wp-graphql' ),
				],
			];
			/**
			 * Filters the mutation input fields for the object type
			 *
			 * @param array $input_fields The array of input fields
			 */
			self::$input_fields = apply_filters( 'graphql_comment_mutation_input_fields', $input_fields );
		}
		return ( ! empty( self::$input_fields ) ) ? self::$input_fields : null;
	}