export interface AugmentPromptWithContinuityInput {
    /** The next scene's prompt to augment. Returned unchanged when nothing applies. */
    nextPrompt: string;
    /**
     * Path to the previous scene's already-rendered keyframe IMAGE. Only used for
     * the Gemini path, and only when it exists on disk and has an image extension.
     */
    priorReferenceImagePath?: string;
    /**
     * Deterministic continuity descriptors (e.g. story-bible cast/setting/prop
     * lines). Used as the Gemini fallback source and when no image is available.
     */
    priorDescriptors?: string[];
    /** Injected fetch (tests). Defaults to global fetch via the key pool. */
    fetcher?: typeof fetch;
    /** Env used to resolve the Gemini key. Defaults to process.env. */
    env?: NodeJS.ProcessEnv;
}
export interface AugmentPromptWithContinuityResult {
    prompt: string;
    applied: boolean;
    source: 'gemini' | 'deterministic' | 'none';
}
/**
 * Opt-in continuity loop: enriches `nextPrompt` with a concise continuity cue
 * derived from the prior scene's rendered keyframe.
 *
 * - Gemini path: when a key is configured AND `priorReferenceImagePath` exists
 *   on disk as an image, one structured Gemini call extracts comma-separated
 *   style/lighting/subject/setting cues and a `Continuity: <cues>` clause is
 *   prepended. source: 'gemini'.
 * - Deterministic path: otherwise, when `priorDescriptors` are supplied, a
 *   `Continuity: <descriptors>` clause is prepended. source: 'deterministic'.
 * - Otherwise the prompt is returned unchanged. source: 'none'.
 *
 * NEVER throws on a Gemini failure / network error / parse error: it falls back
 * to the deterministic path (if descriptors exist) or to 'none'.
 */
export declare function augmentPromptWithContinuity(input: AugmentPromptWithContinuityInput): Promise<AugmentPromptWithContinuityResult>;
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