import { StreamRevealPreset } from './types';
/**
 * How long each preset's entrance plays. The component writes the value as
 * `--tx-stream-reveal-duration`, which the shared keyframes read, and waits the
 * same time before it settles a word into plain text — one number for both.
 */
export declare const STREAM_REVEAL_DURATION_MS: Readonly<Record<StreamRevealPreset, number>>;
export declare const STREAM_PACING_DEFAULTS: {
    readonly wordMs: 24;
    readonly maxLagMs: 600;
    readonly drainMs: 320;
    readonly pauseMs: 400;
};
export declare function streamRevealDuration(preset: StreamRevealPreset | undefined): number;