# Reference: `sushi` Types

The root entrypoint exposes utility types for chain-generic code.

| Type | Purpose |
|---|---|
| `BigintIsh` | Values accepted by bigint constructors/helpers. |
| `TokenFor` | Token type for a chain ID. |
| `CurrencyFor` | Currency type for a chain ID. |
| `NativeFor` | Native currency type for a chain ID. |
| `AddressFor` | Address type for a chain ID. |
| `TxHashFor` | Transaction hash type for a chain ID. |
| `IDFor`, `ID` | Currency/chain ID string helpers. |
| `Mutable`, `Replace`, `UnionToIntersection` | General TypeScript utility types. |

```ts twoslash
import type { AddressFor, ChainId } from 'sushi'

function normalizeKnownAddress<TChainId extends ChainId>(
  chainId: TChainId,
  address: AddressFor<TChainId>,
) {
  return { chainId, address }
}
```

Use these types when writing code that accepts more than one chain environment.