import { Node } from '@tiptap/core';
export declare const DOCUMENT_EQUATION_OPAQUE_SELECTOR = "span[data-document-equation-opaque]";
export declare const MAX_DOCUMENT_EQUATION_OPAQUE_OMML_LENGTH = 262144;
export interface WorkDocumentEquationOpaque {
    display: 'inline' | 'block';
    omml: string;
    text: string;
}
export declare const DocumentEquationOpaque: Node<any, any>;
export declare function createDocumentEquationOpaqueElement(document: Document, source: WorkDocumentEquationOpaque): HTMLElement;
export declare function documentEquationOpaqueFromElement(element: Element): WorkDocumentEquationOpaque | null;
export declare function normalizeDocumentEquationOpaque(source: unknown): WorkDocumentEquationOpaque | null;
export declare function encodeDocumentEquationOpaqueOmml(omml: string): string;
export declare function decodeDocumentEquationOpaqueOmml(encoded: string): string | null;