/** Empty/whitespace-only narration is flagged. */
export declare const MIN_NARRATION_CHARS = 1;
/** Per-scene narration words above this risk overrunning the slide's on-screen time. */
export declare const DEFAULT_MAX_NARRATION_WORDS = 60;
/** Approximate spoken words-per-second used for the timing estimate. */
export declare const WORDS_PER_SECOND = 2.5;
export interface NarrationScene {
    sceneIndex: number;
    /** Planned narration text for this scene. */
    narration: string;
}
export interface CheckNarrationInput {
    scenes: NarrationScene[];
    /**
     * Number of slide images available. When provided, a mismatch against the
     * narration scene count is flagged (the NotebookLM compress/insert failure).
     */
    slideCount?: number;
    /** Per-scene narration word ceiling. Default DEFAULT_MAX_NARRATION_WORDS. */
    maxNarrationWords?: number;
    /**
     * Optional per-scene on-screen budget in seconds. When set, a scene whose
     * estimated spoken duration exceeds its budget is flagged (timing math).
     */
    slideDurationSec?: number;
    /** Override the spoken words-per-second estimate. Default WORDS_PER_SECOND. */
    wordsPerSecond?: number;
}
export interface NarrationWarning {
    /** -1 for whole-deck (structural) warnings not tied to a single scene. */
    sceneIndex: number;
    /**
     * Stable rule id:
     *  'empty-narration' — scene has no narration text
     *  'over-length'     — narration exceeds the per-scene word ceiling
     *  'timing-overrun'  — estimated spoken time exceeds the slide budget
     *  'count-mismatch'  — narration scene count != slide count
     */
    rule: 'empty-narration' | 'over-length' | 'timing-overrun' | 'count-mismatch';
    message: string;
}
export interface CheckNarrationResult {
    warnings: NarrationWarning[];
    ok: boolean;
}
/** Count whitespace-delimited word tokens that contain a letter or digit. */
export declare function countNarrationWords(text: string): number;
/**
 * Run the local narration checks. Advisory: returns warnings, never throws for
 * content. Throws only on invalid input.
 */
export declare function checkNarration(input: CheckNarrationInput): CheckNarrationResult;
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