import type { FilterAstNode, ProductAttribute } from '../types/product.js';
export type FilterInput = FilterAstNode | null | undefined | false;
/**
 * Small typed helper for building FilterQL-compatible filters.
 */
export declare const filter: {
    eq: (attribute: ProductAttribute, value: string) => FilterAstNode;
    notEq: (attribute: ProductAttribute, value: string) => FilterAstNode;
    like: (attribute: ProductAttribute, value: string) => FilterAstNode;
    anyOf: (attribute: ProductAttribute, values: string[]) => FilterAstNode | null;
    and: (...nodes: FilterInput[]) => FilterAstNode | null;
    or: (...nodes: FilterInput[]) => FilterAstNode | null;
    expression: (node: FilterInput) => string;
};
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