export interface ChatOptions {
  signal?: AbortSignal;
}

export interface GatewayChatMessage {
  role: 'system' | 'user' | 'assistant' | 'tool';
  content: string;
}

export abstract class BaseProvider {
  abstract chat(messages: GatewayChatMessage[], modelName: string, options?: ChatOptions): Promise<AsyncIterable<UniversalChunk>>
}