import { GatsbyContext } from '../types/gatsby';
import { PluginConfig } from '../gatsby-node';
import { StateCache } from './cache';
/**
 * Gatsby doesn't generate collection queries for declared third-party schemas,
 * and declaring a schema also causes all sorts of weird and hard to debug problems.
 *
 * This function reads a generated type map of a remote GraphQL schema and generates
 * example values for each schema type, then creates Gatsby nodes for each type,
 * which results in Gatsby generating queries and schema types that have all the
 * possible fields included. Once the schema is created, we remove the mock nodes
 * so they are not returned in queries. This is done through a bit of a hack,
 * which utilizes the exposed `emitter` on the Gatsby context and listening for
 * the `SET_SCHEMA` action to occur. These are internals and might change in the
 * future, but we rely on them for now because the alternative is to require data
 * to be present and have representative values in all fields before one can start
 * writing queries.
 *
 * There is a community effort (with Gatsby HQ support upcoming) to introduce a
 * proper API for declaring schema types, which will make this hack unnecessary.
 * Until it lands, this is the best we can do.
 */
export declare function createTemporaryMockNodes(context: GatsbyContext, pluginConfig: PluginConfig, stateCache: StateCache): Promise<void>;