# Reference: `sushi/evm` Types

The EVM types module exports reusable domain shapes for contracts, Sushi pool data, and Sushi position data.

## Exports

| Type | Purpose |
|---|---|
| `Contract` | viem contract parameter shape without `functionName` or `args`. |
| `EvmID` | EVM currency ID type. |
| `PoolId` | Minimal Sushi pool identity. |
| `PoolBase` | Base Sushi pool data. |
| `PoolV2`, `isPoolV2` | SushiSwap V2 pool type and guard. |
| `PoolV3`, `isPoolV3` | SushiSwap V3 pool type and guard. |
| `MaybeNestedPool`, `unnestPool` | Nested pool shape and unwrapping helper. |
| `PoolHistory`, `PoolHistory1D`, `PoolHistory1W`, `PoolHistory1M` | Pool history data shapes. |
| `PoolSwapFee` | Pool swap fee field shape. |
| `PoolWithAprs`, `PoolWithIncentiveApr`, `PoolWithFeeAprs`, `PoolWithTotalAprs` | APR-augmented pool shapes. |
| `PoolWithBuckets`, `PoolBucket` | Bucketed pool data shapes. |
| `PoolWithIncentives`, `PoolIfIncentivized`, `Incentive`, `RewarderType`, `ChefType` | Incentive and reward data shapes. |
| `PoolHasSteerVaults`, `PoolWithSteerVaults`, `SteerVaultId` | Steer vault pool shapes. |
| `SushiSwapProtocol`, `SushiSwapV2Protocol`, `SushiSwapV3Protocol`, `BladeProtocol` | Protocol constants and types. |
| `SushiPositionBase`, `SushiPositionStaked`, `SushiPositionWithPool` | Sushi position data shapes. |

```ts twoslash
import { isPoolV2, isPoolV3, type PoolId } from 'sushi/evm'

function poolType(pool: PoolId) {
  if (isPoolV2(pool)) {
    return 'v2'
  }

  if (isPoolV3(pool)) {
    return 'v3'
  }

  return 'unknown'
}
```