/**
 * Formula helpers for derived metrics.
 *
 * These are symbolic — they build FormulaExpr objects that get compiled to SQL
 * by the semantic query engine. They do not produce raw SQL strings directly.
 *
 * @example
 * ```ts
 * const avgOrderValue = Orders.metric("avgOrderValue", {
 *   uses: { revenue: totalRevenue, orders: orderCount },
 *   formula: ({ revenue, orders }) => divide(revenue, nullIfZero(orders)),
 * });
 * ```
 */
import type { FormulaExpr } from './types.js';
export declare function divide(a: string | FormulaExpr, b: string | FormulaExpr): FormulaExpr;
export declare function multiply(a: string | FormulaExpr, b: string | FormulaExpr): FormulaExpr;
export declare function subtract(a: string | FormulaExpr, b: string | FormulaExpr): FormulaExpr;
export declare function add(a: string | FormulaExpr, b: string | FormulaExpr): FormulaExpr;
export declare function nullIfZero(a: string | FormulaExpr): FormulaExpr;
export declare function coalesce(a: string | FormulaExpr, fallback: number | string | FormulaExpr): FormulaExpr;
export declare function round(a: string | FormulaExpr, decimals?: number): FormulaExpr;
export declare function floor(a: string | FormulaExpr): FormulaExpr;
export declare function ceil(a: string | FormulaExpr): FormulaExpr;
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