Interface MessagePlugin

interface MessagePlugin {
    processMessage?: (
        message: EnhancedUIMessage,
        context: PluginContext,
    ) => EnhancedUIMessage | Promise<EnhancedUIMessage>;
    processOutgoingMessage?: (
        message: EnhancedUIMessage,
        context: PluginContext,
    ) => EnhancedUIMessage | Promise<EnhancedUIMessage>;
    transformMetadata?: (
        metadata: MessageMetadata,
        context: PluginContext,
    ) => MessageMetadata | Promise<MessageMetadata>;
}