> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-7021d5f4.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# InputMessageItemRoleUnion - Go SDK

> InputMessageItemRoleUnion type definition

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

## Supported Types

### InputMessageItemRoleUser

```go lines theme={null}
inputMessageItemRoleUnion := components.CreateInputMessageItemRoleUnionInputMessageItemRoleUser(components.InputMessageItemRoleUser{/* values here */})
```

### InputMessageItemRoleSystem

```go lines theme={null}
inputMessageItemRoleUnion := components.CreateInputMessageItemRoleUnionInputMessageItemRoleSystem(components.InputMessageItemRoleSystem{/* values here */})
```

### InputMessageItemRoleDeveloper

```go lines theme={null}
inputMessageItemRoleUnion := components.CreateInputMessageItemRoleUnionInputMessageItemRoleDeveloper(components.InputMessageItemRoleDeveloper{/* values here */})
```

## Union Discrimination

Use the `Type` field to determine which variant is active, then access the corresponding field:

```go lines theme={null}
switch inputMessageItemRoleUnion.Type {
	case components.InputMessageItemRoleUnionTypeInputMessageItemRoleUser:
		// inputMessageItemRoleUnion.InputMessageItemRoleUser is populated
	case components.InputMessageItemRoleUnionTypeInputMessageItemRoleSystem:
		// inputMessageItemRoleUnion.InputMessageItemRoleSystem is populated
	case components.InputMessageItemRoleUnionTypeInputMessageItemRoleDeveloper:
		// inputMessageItemRoleUnion.InputMessageItemRoleDeveloper is populated
}
```