/**
 * Layout-preserving text masking.
 *
 * Masked text must occupy the same rendered width as the original: if it
 * re-wraps, everything below it shifts, and replayed clicks/scrolls
 * (recorded against the real layout) land in the wrong place.
 *
 * Two layers:
 * - Measured (main path): per word, build a placeholder from the symbol
 *   alphabet * # _ & @ whose width (computed from canvas-measured per-font
 *   glyph advances) matches the original within WIDTH_TOLERANCE.
 * - Static (fallback, never throws): per-grapheme substitution — CJK and
 *   emoji → ＊, anything else → *. Used when measurement is unavailable or
 *   not worth it.
 */
export declare function isSeparatorCode(code: number): boolean;
/** Layer 1: static width-class masking. Never throws, needs no DOM access. */
export declare function staticMaskText(value: string): string;
/**
 * Mask `value` while preserving its rendered layout. Uses measured
 * placeholders when `element` and canvas metrics are available, otherwise
 * the static width-class map.
 */
export declare function maskTextValue(value: string, element: HTMLElement | null): string;
/** Test-only: reset module-level caches and canvas state. */
export declare function resetTextMaskStateForTesting(): void;
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