# DemandKey

# Type Alias: DemandKey

```ts
type DemandKey = string & object;
```

Defined in: [packages/db/src/query/ir-stable-identity.ts:49](https://github.com/TanStack/db/blob/main/packages/db/src/query/ir-stable-identity.ts#L49)

Exact identity for one loadSubset demand, including its requested window.

## Type Declaration

### \[demandKeyBrand\]

```ts
readonly [demandKeyBrand]: true;
```