import type { ExprValue } from '../types.js';
import { OrderByNode } from '../ast/order-by.js';
/**
 * Indicate ascending sort order for an expression.
 * @param expr An expression to order by.
 * @param nullsFirst Flag indicating if null values should be sorted first.
 */
export declare function asc(expr: ExprValue, nullsFirst?: boolean): OrderByNode;
/**
 * Indicate descending sort order for an expression.
 * @param expr An expression to order by.
 * @param nullsFirst Flag indicating if null values should be sorted first.
 */
export declare function desc(expr: ExprValue, nullsFirst?: boolean): OrderByNode;
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