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# About

This repository is an example of Yearn V2 Vault architecture translated into new ERC-4626 proposed standard for Vaults. Yearn Vault contract is exchanged with minimal implementation of [Rari's solmate](https://github.com/Rari-Capital/solmate) ERC-4626. Controller and Strategy contracts are left untouched. Basic DAI/Compound stategy is used because of it's simplicity. Some functions from original Yearn Vault got rewritten to operate with underlying ERC-4626, that is usually noted through NatSpec's @notice tag. Contract is neither tested nor optimized.

All is run against forked network with real DAI used and actual compounding from Compound. Console.log will return internal balance sheet change (interests accrued) after depositing funds into strategy and waiting some blocks for profit.

This is by no means robust simulation but could be extended easily. As is, you can just verify that Yearn V2 works fine with ERC4626 through inspection of a small change in accured profits from Compound strategy.

![Vault Balanace Sheet Change](https://raw.githubusercontent.com/oroghene/vault-fun/main/sim.png)

### To do / Future

1. Yearn is an example of aggregator vault. It would be interesting to build lending (aave) or options (ribbon) vault minimal example.
2. Stablecoins / Pegged tokens could also be a target of vault-fun.
3. Swap-like pools, e.g Balancer.

# How to run

Set `.env.example`

`yarn install`

First, start the hardhat network: `npx hardhat node`

To simulate deployment and deposits run: `npx hardhat run scripts/simulate.ts --network localhost`

There is currently no test beyond basic deployment of Vault + Strategy to a local hardhat network.

# Resources

ERC4626 Proposal: https://github.com/ethereum/EIPs/blob/master/EIPS/eip-4626.md

Yearn V2 Contracts: https://github.com/yearn/yearn-starter-pack

ERC4626 Discussion: https://ethereum-magicians.org/t/eip-4626-yield-bearing-vault-standard/7900/45

# Solidity Template

Uses

- [Hardhat](https://github.com/nomiclabs/hardhat): compile and run the smart contracts on a local development network
- [TypeChain](https://github.com/ethereum-ts/TypeChain): generate TypeScript types for smart contracts
- [Ethers](https://github.com/ethers-io/ethers.js/): renowned Ethereum library and wallet implementation
- [Waffle](https://github.com/EthWorks/Waffle): tooling for writing comprehensive smart contract tests
- [Solhint](https://github.com/protofire/solhint): linter
- [Prettier Plugin Solidity](https://github.com/prettier-solidity/prettier-plugin-solidity): code formatter

This is a GitHub template, which means you can reuse it as many times as you want. You can do that by clicking the "Use this
template" button at the top of the page.

## Usage

### Pre Requisites

Before running any command, make sure to install dependencies:

```sh
$ yarn install
```

### Compile

Compile the smart contracts with Hardhat:

```sh
$ yarn compile
```

### Test

Run the Mocha tests:

```sh
$ yarn test
```

### Deploy contract to netowrk (requires Mnemonic and infura API key)

```
npx hardhat run --network rinkeby ./scripts/deploy.ts
```

### Validate a contract with etherscan (requires API ke)

```
npx hardhat verify --network <network> <DEPLOYED_CONTRACT_ADDRESS> "Constructor argument 1"
```

### Added plugins

- Gas reporter [hardhat-gas-reporter](https://hardhat.org/plugins/hardhat-gas-reporter.html)
- Etherscan [hardhat-etherscan](https://hardhat.org/plugins/nomiclabs-hardhat-etherscan.html)

## Thanks

If you like it than you soulda put a start ⭐ on it

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