import type { QueryOperator } from './types';
/**
 * Operator handler function type
 */
export type OperatorHandler = (column: string, value: unknown) => [string, unknown[]];
/**
 * Build comma-separated '?' placeholders for N values.
 * Uses loop instead of arr.map(() => '?').join(', ') to avoid
 * intermediate array allocation on hot path.
 */
export declare function placeholders(n: number): string;
/**
 * Built-in operator handlers
 */
export declare const OPERATORS: Record<QueryOperator, OperatorHandler>;
/**
 * List of all valid operator names
 */
export declare const VALID_OPERATORS: QueryOperator[];
/**
 * Set for O(1) operator validation lookups
 */
export declare const VALID_OPERATORS_SET: ReadonlySet<string>;
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