import type { Field } from "@frictionless-ts/metadata";
import type { CellUniqueError } from "@frictionless-ts/metadata";
import type { CellMapping } from "../Mapping.ts";
export declare function checkCellUnique(field: Field, mapping: CellMapping): {
    isErrorExpr: import("nodejs-polars").Expr;
    errorTemplate: CellUniqueError;
} | undefined;