fn preset() -> serde_json::Value {
    serde_json::json!({
        "balances": BalancesConfig {
            balances: endowed_accounts.iter().cloned().map(|k| (k, 1u128 << 60)).collect::<Vec<_>>(),
        },
        "parachainInfo": ParachainInfoConfig {
            parachain_id: id,
            ..Default::default()
        },
        "collatorSelection": CollatorSelectionConfig {
            invulnerables: invulnerables.iter().cloned().map(|(acc, _)| acc).collect(),
            candidacy_bond: BRIDGE_HUB_ROCOCO_ED * 16,
            ..Default::default()
        },
        "session": SessionConfig {
            keys: invulnerables
                .into_iter()
                .map(|(acc, aura)| {
                    (
                        acc.clone(),                         // account id
                        acc,                                 // validator id
                        SessionKeys { aura },            // session keys
                    )
                })
                .collect(),
            ..Default::default()
        },
        "polkadotXcm": PolkadotXcmConfig {
            safe_xcm_version: Some(SAFE_XCM_VERSION),
            ..Default::default()
        },
        "bridgeWestendGrandpa": BridgeWestendGrandpaConfig {
            owner: bridges_pallet_owner.clone(),
            ..Default::default()
        },
        "bridgeWestendMessages": BridgeWestendMessagesConfig {
            owner: bridges_pallet_owner.clone(),
            ..Default::default()
        },
        "ethereumSystem": EthereumSystemConfig {
            para_id: id,
            asset_hub_para_id,
            ..Default::default()
        }
    })
}

fn preset() -> serde_json::Value {
    let config = RuntimeGenesisConfig {
        balances: BalancesConfig {
            balances: endowed_accounts
                .iter()
                .cloned()
                .map(|k| (k, 1u128 << 60))
                .collect::<Vec<_>>(),
        },
        parachain_info: ParachainInfoConfig { parachain_id: id, ..Default::default() },
        collator_selection: CollatorSelectionConfig {
            invulnerables: invulnerables.iter().cloned().map(|(acc, _)| acc).collect(),
            candidacy_bond: BRIDGE_HUB_ROCOCO_ED * 16,
            ..Default::default()
        },
        session: SessionConfig {
            keys: invulnerables
                .into_iter()
                .map(|(acc, aura)| {
                    (
                        acc.clone(),          // account id
                        acc,                  // validator id
                        SessionKeys { aura }, // session keys
                    )
                })
                .collect(),
            ..Default::default()
        },
        polkadot_xcm: PolkadotXcmConfig {
            safe_xcm_version: Some(SAFE_XCM_VERSION),
            ..Default::default()
        },
        bridge_westend_grandpa: BridgeWestendGrandpaConfig {
            owner: bridges_pallet_owner.clone(),
            ..Default::default()
        },
        bridge_westend_messages: BridgeWestendMessagesConfig {
            owner: bridges_pallet_owner.clone(),
            ..Default::default()
        },
        ethereum_system: EthereumSystemConfig {
            para_id: id,
            asset_hub_para_id,
            ..Default::default()
        },
        ..Default::default()
    };

    serde_json::to_value(config).expect("Could not build genesis config.")
}