/**
 * Utility for caching keyword relationships for fast access
 * Dynamically builds keyword relationships from existing joinkeywordParser
 *
 * SOURCE DICTIONARIES (single source of truth):
 * - JOIN patterns: /src/tokenReaders/CommandTokenReader.ts (joinTrie, lines 10-29)
 * - Command patterns: /src/tokenReaders/CommandTokenReader.ts (keywordTrie, lines 30-118)
 *
 * MIGRATION NOTE:
 * If keywords are added/modified in CommandTokenReader.ts, update the
 * extractCommandPatternsFromTrie() method to reflect those changes.
 * JOIN patterns are automatically extracted via joinkeywordParser.
 */
export declare class KeywordCache {
    private static joinSuggestionCache;
    private static commandSuggestionCache;
    private static initialized;
    /**
     * Initialize JOIN-related keyword suggestions
     * Dynamically generated based on information extracted from joinkeywordParser
     */
    private static initialize;
    /**
     * Get next suggestions for the specified keyword
     * Example: "left" → ["join", "outer", "outer join"]
     */
    static getJoinSuggestions(keyword: string): string[];
    /**
     * Check if a keyword is a valid JOIN keyword
     * Uses existing joinkeywordParser as the primary resource
     */
    static isValidJoinKeyword(keyword: string): boolean;
    /**
     * Generate suggestions based on partial keyword input
     * Example: "le" → find keywords starting with "left"
     */
    static getPartialSuggestions(partialKeyword: string): string[];
    /**
     * Get all JOIN keywords
     */
    static getAllJoinKeywords(): string[];
    /**
     * Initialize command keyword patterns
     * Dynamically extracted from commandKeywordTrie
     */
    private static initializeCommandKeywords;
    /**
     * Extract multi-word patterns from commandKeywordTrie
     * Uses known patterns since direct extraction from trie structure is difficult
     *
     * SOURCE: /src/tokenReaders/CommandTokenReader.ts keywordTrie (lines 30-118)
     * MIGRATION: When updating, copy multi-word patterns from the source trie
     */
    private static extractCommandPatternsFromTrie;
    /**
     * Get next command suggestions for the specified keyword
     * Example: "group" → ["by"]
     */
    static getCommandSuggestions(keyword: string): string[];
    /**
     * Force cache re-initialization
     * Used for testing or when keyword definitions have changed
     */
    static reset(): void;
}