export type Vertical = 'general' | 'news' | 'code' | 'docs' | 'papers' | 'images';
export declare const VERTICALS: readonly Vertical[];
export interface ClassifyOptions {
    /** Override classifier (e.g., from `category` input on search tool). */
    hint?: Vertical;
    /** When date filters are present in the search input, push toward 'news'. */
    hasDateBound?: boolean;
    /** Inject a clock for deterministic relative-date parsing in tests. */
    now?: Date;
}
export interface DateHint {
    fromDate?: string;
    toDate?: string;
}
export interface DetailedClassification {
    vertical: Vertical;
    dateHint?: DateHint;
}
/**
 * STRICT error-intent predicate. True only for genuinely error-shaped tokens
 * (errno E-codes, underscore ALL-CAPS codes, ALL-CAPS-adjacent-numeric status
 * codes, PascalCase *Error/*Exception names) — NOT for plain acronyms like
 * NGINX or GRAPHQL. Gates docs-vertical suppression + dictionary demotion, so a
 * false positive here would misroute a normal docs query.
 */
export declare function queryHasErrorToken(query: string): boolean;
/**
 * Return every quotable code token found in the query, in order. BROAD by
 * design — quoting an acronym atom is benign. Used to wrap tokens in the
 * dispatched engine query; not an intent signal.
 */
export declare function extractErrorTokens(query: string): string[];
export declare function parseDateHint(query: string, now?: Date): DateHint | undefined;
export declare function classifyIntentDetailed(query: string, opts?: ClassifyOptions): DetailedClassification;
export declare function classifyIntent(query: string, opts?: ClassifyOptions): Vertical;
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