> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# InputMessageItemRoleUnion - TypeScript SDK

> InputMessageItemRoleUnion type definition

<Warning>
  The TypeScript SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/typescript-sdk/issues).
</Warning>

## Supported Types

### `models.InputMessageItemRoleUser`

```typescript lines theme={null}
const value: models.InputMessageItemRoleUser = "user";
```

### `models.InputMessageItemRoleSystem`

```typescript lines theme={null}
const value: models.InputMessageItemRoleSystem = "system";
```

### `models.InputMessageItemRoleDeveloper`

```typescript lines theme={null}
const value: models.InputMessageItemRoleDeveloper = "developer";
```