import type { Engine, EngineRunOpts, EngineResult } from "../shared/types.js";
/**
 * MockEngine — a zero-cost engine for E2E and integration tests.
 * Returns canned responses with simulated word-by-word streaming.
 * Cost is fixed at $0.001 per run for budget tracking tests.
 */
export declare class MockEngine implements Engine {
    name: "mock";
    private responseIndex;
    private fixedResponse?;
    constructor(opts?: {
        fixedResponse?: string;
    });
    run(opts: EngineRunOpts): Promise<EngineResult>;
}
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