Created a migration for adding ETHx as collateral to mainnet WETH

deployments/mainnet/weth/migrations/1715192704_add_ethx_collateral.ts

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+import { DeploymentManager } from '../../../../plugins/deployment_manager/DeploymentManager';
+import { migration } from '../../../../plugins/deployment_manager/Migration';
+import { exp, proposal } from '../../../../src/deploy';
+
+import { expect } from 'chai';
+
+interface Vars { };
+
+const BORROW_COLLATERAL_FACTOR = exp(0.9, 18);
+const LIQUIDATE_COLLATERAL_FACTOR = exp(0.93, 18);
+const LIQUIDATION_FACTOR = exp(0.975, 18);
+const SUPPLY_CAP = exp(5_000, 18);
+
+const ETHX_ADDRESS = '0xA35b1B31Ce002FBF2058D22F30f95D405200A15b';
+const ETHX_PRICE_FEED_ADDRESS = '0xdd487947c579af433AeeF038Bf1573FdBB68d2d3';
+
+export default migration('1715192704_add_ethx_collateral', {
+  prepare: async (deploymentManager: DeploymentManager) => {
+    return {};
+  },
+
+  enact: async (deploymentManager: DeploymentManager, govDeploymentManager: DeploymentManager, vars: Vars) => {
+    const trace = deploymentManager.tracer();
+
+    const ethx = await deploymentManager.existing(
+      'ETHX',
+      ETHX_ADDRESS,
+      'mainnet',
+      'contracts/ERC20.sol:ERC20'
+    );
+    const ethxPricefeed = await deploymentManager.existing(
+      'ETHX:priceFeed',
+      ETHX_PRICE_FEED_ADDRESS,
+      'mainnet'
+    );
+
+    const {
+      governor,
+      comet,
+      configurator,
+      cometAdmin,
+    } = await deploymentManager.getContracts();
+
+    const newAssetConfig = {
+      asset: ethx.address,
+      priceFeed: ethxPricefeed.address,
+      decimals: await ethx.decimals(),
+      borrowCollateralFactor: BORROW_COLLATERAL_FACTOR,
+      liquidateCollateralFactor: LIQUIDATE_COLLATERAL_FACTOR,
+      liquidationFactor: LIQUIDATION_FACTOR,
+      supplyCap: SUPPLY_CAP,
+    };
+
+    const actions = [
+      // 1. Call the add asset function on the configurator contract
+      {
+        contract: configurator,
+        signature:
+          'addAsset(address,(address,address,uint8,uint64,uint64,uint64,uint128))',
+        args: [comet.address, newAssetConfig],
+      },
+
+      // 2. Deploy and upgrade to a new version of Comet
+      {
+        contract: cometAdmin,
+        signature: 'deployAndUpgradeTo(address,address)',
+        args: [configurator.address, comet.address],
+      },
+    ];
+
+    const description = 'Add ETHx price feed and upgrade Comet to use it';
+    const txn = await deploymentManager.retry(async () =>
+      governor.propose(...(await proposal(actions, description)))
+    );
+    trace(txn);
+
+    const event = (await txn.wait()).events.find(
+      (event) => event.event === 'ProposalCreated'
+    );
+    const [proposalId] = event.args;
+    trace(`Created proposal ${proposalId}.`);
+  },
+
+  async enacted(deploymentManager: DeploymentManager): Promise<boolean> {
+    return true;
+  },
+
+  async verify(deploymentManager: DeploymentManager) {
+    const { comet } = await deploymentManager.getContracts();
+
+    const ethxInfo = await comet.getAssetInfoByAddress(ETHX_ADDRESS);
+
+    // check pricefeed
+    expect(await ethxInfo.priceFeed).to.be.eq(ETHX_PRICE_FEED_ADDRESS);
+    // check config
+    expect(await ethxInfo.borrowCollateralFactor).to.be.eq(
+      BORROW_COLLATERAL_FACTOR
+    );
+    expect(await ethxInfo.liquidateCollateralFactor).to.be.eq(
+      LIQUIDATE_COLLATERAL_FACTOR
+    );
+    expect(await ethxInfo.liquidationFactor).to.be.eq(LIQUIDATION_FACTOR);
+    expect(await ethxInfo.supplyCap).to.be.eq(SUPPLY_CAP);
+  },
+});