/**
 * FTS5 query helpers for Zimbabwe Law MCP.
 *
 * Handles query sanitization and variant generation for SQLite FTS5.
 */
/**
 * Detect whether input contains FTS5 boolean operators.
 */
export declare function hasBooleanOperators(input: string): boolean;
/**
 * Sanitize user input for safe FTS5 queries.
 * Preserves boolean operators (AND, OR, NOT) when detected.
 */
export declare function sanitizeFtsInput(input: string): string;
/**
 * Build FTS5 query variants for a search term.
 * Returns variants in order of specificity (most specific first):
 * 1. Exact phrase match
 * 2. All terms required (AND)
 * 3. Prefix AND (last term gets prefix wildcard)
 * 4. Stemmed prefix (suffix-truncated + wildcard)
 * 5. Any term matches (OR) — broad fallback
 *
 * When boolean operators are detected, passes query through as-is.
 */
export declare function buildFtsQueryVariants(sanitized: string): string[];
/**
 * Build a SQL LIKE pattern from search terms.
 * Used as a final fallback when FTS5 returns no results.
 * Example: "penalty offence" -> "%penalty%offence%"
 */
export declare function buildLikePattern(query: string): string;
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