/**
 * Agent reference helpers for `BookEditorMonaco`.
 *
 * @private function of BookEditorMonaco
 */
export declare const BookEditorMonacoTokenization: {
    AGENT_URL_REFERENCE_REGEX: RegExp;
    AGENT_REFERENCE_TOKEN_REGEX: RegExp;
    AGENT_REFERENCE_BRACED_REGEX: RegExp;
    AGENT_REFERENCE_HIGHLIGHT_REGEXES: readonly [RegExp, RegExp, RegExp, RegExp, RegExp];
    extractAgentReferenceValue: (token: string) => string;
    resolveAgentReferenceToUrl: (referenceValue: string) => string | null;
    extractAgentReferenceMatches: (content: string) => {
        value: string;
        url: string;
        index: number;
        length: number;
    }[];
};