para_backing_state: RuntimeDescriptor<
    [_: number],

        | {
            constraints: {
                dmp_remaining_messages: number[];
                future_validation_code?: [number, FixedSizeBinary<32>];
                hrmp_channels_out: [
                    number,
                    { bytes_remaining: number; messages_remaining: number },
                ][];
                hrmp_inbound: number[];
                max_code_size: number;
                max_hrmp_num_per_candidate: number;
                max_pov_size: number;
                max_ump_num_per_candidate: number;
                min_relay_parent_number: number;
                required_parent: Binary;
                ump_remaining: number;
                ump_remaining_bytes: number;
                upgrade_restriction?: UpgradeRestriction;
                validation_code_hash: FixedSizeBinary<32>;
            };
            pending_availability: {
                candidate_hash: FixedSizeBinary<32>;
                commitments: {
                    head_data: Binary;
                    horizontal_messages: { data: Binary; recipient: number }[];
                    hrmp_watermark: number;
                    new_validation_code?: Binary;
                    processed_downward_messages: number;
                    upward_messages: Binary[];
                };
                descriptor: {
                    collator: FixedSizeBinary<32>;
                    erasure_root: FixedSizeBinary<32>;
                    para_head: FixedSizeBinary<32>;
                    para_id: number;
                    persisted_validation_data_hash: FixedSizeBinary<32>;
                    pov_hash: FixedSizeBinary<32>;
                    relay_parent: FixedSizeBinary<32>;
                    signature: FixedSizeBinary<64>;
                    validation_code_hash: FixedSizeBinary<32>;
                };
                max_pov_size: number;
                relay_parent_number: number;
            }[];
        }
        | undefined,
>

Returns the state of parachain backing for a given para.