import { CollectionField, NumberField, FieldObserver, SchemaFieldConstructor } from "../types/interfaces";
export declare function createRelatedCollection(lookupRef: FieldObserver): SchemaFieldConstructor<CollectionField>;
export declare function createSizeField(collectionFieldRef: FieldObserver): SchemaFieldConstructor<NumberField>;
export declare function createSumField(numberFieldRef: FieldObserver, unionFieldRef: FieldObserver): SchemaFieldConstructor<NumberField>;