export declare function tokenize(value?: string): string[];
export declare function stripAccents(value?: string): string;
export declare function uniqueTerms(values: string[]): string[];
export declare function host(value?: string): string;
export declare function canonicalUrl(value?: string): string;
export declare function normalizeDate(value: string): string;
/**
 * Local-timezone YYYY-MM-DD — the user's calendar day. The radar runs on
 * calendar days (one brief record per date), so the day must roll over at
 * local midnight, not UTC (a UTC date would file the record 3–7h early for
 * the Americas). DST-safe: callers shift the Date first, then format.
 */
export declare function localDateString(d?: Date): string;
/**
 * Strict YYYY-MM-DD calendar check: rejects the shape-valid but impossible
 * dates ("2026-13-45", "2026-02-30") that a plain regex lets through.
 */
export declare function isValidCalendarDate(value: string): boolean;
export declare function daysSince(value: string, now?: number): number | null;
/**
 * Term-overlap similarity with phrase bonus.
 *
 * The radar is keyless: this IS the semantic signal, so multi-word concepts
 * matter as much as single terms. Bigram phrases ("open source", "café
 * especial") are matched as units — adjacency preserves meaning that loose
 * token overlap destroys. Terms weigh equally so a lone long generic stem
 * ("desenvolvimento") cannot dominate; the sqrt normalization keeps it a
 * bounded 0..1 similarity.
 */
export declare function lexicalSimilarity(a: string, b: string): number;
export declare function clamp(value: number, min: number, max: number): number;
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