import type { GraphQLObjectType } from 'graphql';
export interface TypePolicies {
    /**
     * If defined, these are the keys we look for in an object to determine
     * identity, if no rule is defined otherwise. When we execute, we check
     * these keys to determine whether they exist on the type, and if so we
     * add them to the Document so we are able to cache against them
     *
     * Defaults to "id", "uuid", "_id"
     */
    defaultKeys?: string[];
    /**
     * A Map of TypeNames to keys used to determine identity for the
     * object
     *
     * Set to "null" to indicate the type should never be cached
     * Set to "__typename" to indicate the object is a singleton
     */
    typeKeys?: Record<string, string | string[] | null>;
}
export declare function getCacheKey(typePolicies: TypePolicies, objectType: GraphQLObjectType): string | null;