import { LangOptions, LanguageProvider } from "../language-provider.ts";
import { LangMessage, LangMessageItem, LangMessageRole, LangMessages } from "../messages.ts";
type MessageFactory = string | (() => string);
export type MockResponseStreamOptions = {
    /**
     * Deterministic message to emit every time. Overrides `messages` rotation.
     */
    message?: MessageFactory;
    /**
     * Pool of pre-written answers that the mock will rotate through.
     */
    messages?: string[];
    /**
     * Characters per streamed chunk.
     */
    chunkSize?: number;
    /**
     * Delay in milliseconds between chunks.
     */
    speedMs?: number;
    /**
     * Optional custom provider name for debugging.
     */
    name?: string;
    defaultOptions?: LangOptions;
};
export declare class MockResponseStreamLang extends LanguageProvider {
    private readonly config;
    private presetIndex;
    constructor(options?: MockResponseStreamOptions);
    ask(prompt: string, options?: LangOptions): Promise<LangMessages>;
    chat(messages: {
        role: LangMessageRole;
        items: LangMessageItem[];
    }[] | LangMessage[] | LangMessages, options?: LangOptions): Promise<LangMessages>;
    private resolveOverrides;
    private pickMessage;
    private resolveMessageList;
    private resolveChunkSize;
    private resolveSpeed;
    private chunkText;
    private streamMockResponse;
}
export {};