/**
 * FTS5 query helpers for Singapore Law MCP.
 *
 * Handles query sanitization and variant generation for SQLite FTS5.
 */
/**
 * Sanitize user input for safe FTS5 queries.
 * Removes characters that have special meaning in FTS5 syntax.
 */
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 match on last term
 */
export declare function buildFtsQueryVariants(sanitized: string): string[];
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