import { NumberField, LookUpField } from "../../types/interfaces";
/**
 * Sums up a specific field on every document an stores the result on a related document of a different schema
 *
 * @param numberField Field we want to sum
 * @param accumulator Field where the result will be stored
 * @param unionField Field located on the same schema as the first field and points to the schema on the second field
 */
export declare function Formula(unionField: LookUpField, numberField: NumberField, accumulator: NumberField): void;