/**
 * Svelte action: animates a text element's content via JS RAF.
 *
 * Implemented modes:
 *   • fade-letters — wraps each character in a <span> and fades them in with stagger
 *   • bounce-in    — same wrapping, scale+translate pop per character
 *   • handwriting  — re-renders the text inside an <svg><text> with stroke + transparent
 *                    fill and animates `stroke-dashoffset` so the text appears to be
 *                    drawn left-to-right (works best with cursive/script fonts)
 *
 * Other modes (instant, typewriter, fade-words) are handled elsewhere by the
 * /present render path — this action no-ops for those.
 *
 * Each runner builds a `currentSeek(elapsedMs)` closure that snapshots the
 * setup state and computes the visual at any virtual time. The live RAF loop
 * calls it with real elapsed; the MP4/GIF export pipeline calls it via
 * `window.__seekAllTextAnims(virtualMs)` for frame-perfect captures.
 *
 * The action also registers a restart fn into `window.__svgAnimRestart` so the
 * server-side video export pipeline can reset all animations under the
 * virtual clock at the start of the slide hold (same pattern as FlowMarkers
 * and arrowClipDraw).
 */
export type TextAnimateMode = 'instant' | 'typewriter' | 'fade-words' | 'fade-letters' | 'handwriting' | 'bounce-in' | 'scramble-in' | 'slot-machine' | 'drop' | 'glitch' | 'marquee' | 'blur-in' | 'stretch' | 'slide-words' | 'wave' | 'typewriter-erase';
export interface TextAnimateParams {
    enabled: boolean;
    mode: TextAnimateMode;
    content: string;
    /** Total duration in ms for handwriting; for stagger modes it's the per-letter
     * delay budget — actual total = stagger * letterCount + perLetterDuration. */
    duration: number;
    stagger?: number;
    loop?: boolean;
    /** Cosmetic: applied to the inner SVG text in handwriting mode. */
    color?: string;
    fontSize?: number;
    fontFamily?: string;
    fontWeight?: number | string;
    fontStyle?: string;
    textAlign?: 'left' | 'center' | 'right';
    /** Slide loop duration; when present the effective duration aligns to a
     * cycle that fits an integer number of times into slide_duration so GIF
     * loops are seamless in Flow mode. */
    slideDuration?: number;
    /** Bumped by the host component when ANY meaningful prop changes — without
     * this the action would silently keep running with stale values. */
    key?: unknown;
}
export declare function textAnimate(node: HTMLElement, params: TextAnimateParams): {
    update(p: TextAnimateParams): void;
    destroy(): void;
};