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import type { Maybe } from '../jsutils/Maybe';
import type { DocumentNode } from '../language/ast';
import type { GraphQLFieldResolver } from '../type/definition';
import type { GraphQLSchema } from '../type/schema';
import type { ExecutionArgs, ExecutionResult } from './execute';
/**
* Implements the "Subscribe" algorithm described in the GraphQL specification.
*
* Returns a Promise which resolves to either an AsyncIterator (if successful)
* or an ExecutionResult (error). The promise will be rejected if the schema or
* other arguments to this function are invalid, or if the resolved event stream
* is not an async iterable.
*
* If the client-provided arguments to this function do not result in a
* compliant subscription, a GraphQL Response (ExecutionResult) with
* descriptive errors and no data will be returned.
*
* If the source stream could not be created due to faulty subscription
* resolver logic or underlying systems, the promise will resolve to a single
* ExecutionResult containing `errors` and no `data`.
*
* If the operation succeeded, the promise resolves to an AsyncIterator, which
* yields a stream of ExecutionResults representing the response stream.
*
* Accepts either an object with named arguments, or individual arguments.
*/
export declare function subscribe(
args: ExecutionArgs,
): Promise<AsyncGenerator<ExecutionResult, void, void> | ExecutionResult>;
/**
* Implements the "CreateSourceEventStream" algorithm described in the
* GraphQL specification, resolving the subscription source event stream.
*
* Returns a Promise which resolves to either an AsyncIterable (if successful)
* or an ExecutionResult (error). The promise will be rejected if the schema or
* other arguments to this function are invalid, or if the resolved event stream
* is not an async iterable.
*
* If the client-provided arguments to this function do not result in a
* compliant subscription, a GraphQL Response (ExecutionResult) with
* descriptive errors and no data will be returned.
*
* If the the source stream could not be created due to faulty subscription
* resolver logic or underlying systems, the promise will resolve to a single
* ExecutionResult containing `errors` and no `data`.
*
* If the operation succeeded, the promise resolves to the AsyncIterable for the
* event stream returned by the resolver.
*
* A Source Event Stream represents a sequence of events, each of which triggers
* a GraphQL execution for that event.
*
* This may be useful when hosting the stateful subscription service in a
* different process or machine than the stateless GraphQL execution engine,
* or otherwise separating these two steps. For more on this, see the
* "Supporting Subscriptions at Scale" information in the GraphQL specification.
*/
export declare function createSourceEventStream(
args: ExecutionArgs,
): Promise<AsyncIterable<unknown> | ExecutionResult>;
/** @deprecated will be removed in next major version in favor of named arguments */
export declare function createSourceEventStream(
schema: GraphQLSchema,
document: DocumentNode,
rootValue?: unknown,
contextValue?: unknown,
variableValues?: Maybe<{
readonly [variable: string]: unknown;
}>,
operationName?: Maybe<string>,
subscribeFieldResolver?: Maybe<GraphQLFieldResolver<any, any>>,
): Promise<AsyncIterable<unknown> | ExecutionResult>;
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