import type { SQLParserDialect } from '@memberjunction/sql-dialect';
/**
 * Symbol table for managing CTE names during composition.
 *
 * Guarantees uniqueness at CTE creation time — name collisions become
 * impossible by construction.
 *
 * All name comparisons are case-insensitive (SQL Server and PostgreSQL
 * both treat unquoted identifiers case-insensitively for CTEs).
 */
export declare class SymbolTable {
    /** Allocated names (canonical lowercase → original casing) */
    private allocatedNames;
    /** Dialect for identifier quoting */
    private dialect;
    constructor(dialect: SQLParserDialect);
    /**
     * Registers a name. If the name is already taken, generates a unique
     * suffix (`Name__2`, `Name__3`, ...) and returns the suffixed version.
     *
     * @param desiredName - The preferred name (unquoted)
     * @returns The actual allocated name (may be suffixed if collision)
     */
    Register(desiredName: string): string;
    /**
     * Pre-seeds the table with names that are already taken (e.g., outer CTE names).
     */
    Seed(name: string): void;
    /**
     * Checks if a name (case-insensitive) is already allocated.
     */
    Has(name: string): boolean;
    /**
     * Returns the dialect-quoted form of a name via `dialect.QuoteIdentifier()`.
     */
    Quote(name: string): string;
    /**
     * Generates a composition CTE name from a query name + hash, registers it,
     * and returns the quoted form.
     */
    RegisterCompositionCTE(queryName: string, hashInput: string): string;
    /**
     * Returns the current count of allocated names.
     */
    get Size(): number;
}
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