type MarkAttrs = Record<string, unknown>;
/**
 * Normalize "off" values used by cascade-aware formatting marks.
 */
export declare const isOffValue: (value: unknown) => boolean;
export declare const negationChecks: Record<string, (attrs?: MarkAttrs) => boolean>;
/**
 * Determine whether a mark is currently negated (explicitly turning formatting off).
 */
export declare const isNegatedMark: (name: string, attrs?: MarkAttrs) => boolean;
export default isNegatedMark;