export type FilterVerdict = 'safe' | 'risky' | 'likely-blocked';
/** Severity ordering, mirrors Python VERDICT_ORDER. */
export declare const VERDICT_ORDER: Record<FilterVerdict, number>;
/**
 * Keyword categories matching the Python prompt's flagged-element list. Each
 * category contributes to the risk score. Two distinct categories present, or a
 * high-weight category, escalate the verdict to likely-blocked.
 */
export declare const RISK_CATEGORIES: Record<string, {
    weight: number;
    keywords: string[];
}>;
export interface ImageFilterCandidate {
    sceneIndex: number;
    /**
     * The text used to generate / describe the slide image (prompt or caption).
     * The local heuristic scans this for known-risky keyword categories.
     */
    prompt: string;
}
export interface CheckImageFilterInput {
    candidates: ImageFilterCandidate[];
    /**
     * Flag any candidate at or above this verdict. Default 'risky'. (The Python
     * default is 'likely-blocked', but for a text-only heuristic 'risky' is the
     * safer advisory default; callers can raise it.)
     */
    threshold?: FilterVerdict;
}
export interface ImageFilterWarning {
    sceneIndex: number;
    rule: 'content-filter-risk';
    verdict: FilterVerdict;
    /** Risk categories that matched, e.g. ['weapon', 'supernatural']. */
    categories: string[];
    message: string;
}
export interface CheckImageFilterResult {
    warnings: ImageFilterWarning[];
    ok: boolean;
}
/** Classify one prompt into a verdict + matched categories (pure, local). */
export declare function classifyImagePrompt(prompt: string): {
    verdict: FilterVerdict;
    categories: string[];
};
/**
 * Run the local image-filter heuristic over candidate slide prompts. Advisory:
 * returns warnings, never throws for content. Throws only on invalid input.
 */
export declare function checkImageFilter(input: CheckImageFilterInput): CheckImageFilterResult;
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