/**
 * PostgreSQL Performance Tools - Shared Helpers
 *
 * Common utilities shared across performance stat modules.
 */
import type { PostgresAdapter } from "../../postgres-adapter.js";
/** Helper to handle undefined params (allows tools to be called without {}) */
export declare const defaultToEmpty: (val: unknown) => unknown;
/** Helper to coerce string numbers to JavaScript numbers (PostgreSQL returns BIGINT as strings) */
export declare const toNum: (val: unknown) => number | null;
/**
 * P507: Coerce string-typed numbers to actual numbers for z.preprocess().
 * Returns undefined for non-numeric strings so .optional() defaults kick in.
 * Prevents NaN leaking into SQL via z.coerce.number().
 */
export declare const coerceNumber: (val: unknown) => unknown;
/**
 * P154: Validate that a table/schema exists before executing performance queries.
 * Throws a ValidationError so the handler's catch block routes through
 * formatHandlerErrorResponse(), ensuring code/category/recoverable fields
 * are included in the structured error response.
 *
 * Call inside the handler's try/catch BEFORE executing the main query.
 */
export declare function validatePerformanceTableExists(adapter: PostgresAdapter, table?: string, schema?: string): Promise<void>;
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