export declare function makeAnimationSeed(text: string, timestamp: number): number;
export declare function hashNoise(seed: number, charIndex: number, tick: number, depth: number): number;
/** Smoothstep interpolation for smooth color band transitions */
export declare function smoothstep(min: number, max: number, value: number): number;
export declare function stripDecorativeIcons(text: string): string;
export declare function computeOverlapLen(oldStr: string, newStr: string): number;
/**
 * For static lines, detect whether a text change is a minor mutation
 * (most characters remain in the same positions). Used to suppress
 * re-flashing when embedded stats (TPS, tokens) change at the end of
 * a header line while the prefix (flow name, model) stays stable.
 */
export declare function isMinorStaticMutation(oldStr: string, newStr: string): boolean;
export declare function selectScrambleChar(depth: number, dist: number, elapsed: number, seed?: number, textLen?: number): string;
export declare function selectSparkChar(seed: number, charIndex: number, tick: number): string;
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