import type { ContextOperationRequest } from '../context.ts';
import type { EngineInternals } from './internals.ts';
import type { OperationWithCallerStack } from './operations-router.ts';
import { SpeculativeExecutionState } from './speculative-execution-state.ts';
type SpeculateOperation = Extract<ContextOperationRequest, {
    type: 'speculate';
}>;
type SpeculativeOperationGenerator = Generator<ContextOperationRequest, unknown, unknown> | AsyncGenerator<ContextOperationRequest, unknown, unknown>;
export type SpeculateOperationCallbacks = {
    runOperationWithResult: (workflowId: string, operation: OperationWithCallerStack, execute: () => Promise<unknown>) => Promise<void>;
    executeSubOperation: (workflowId: string, operation: ContextOperationRequest, signal?: AbortSignal, speculativeState?: SpeculativeExecutionState) => Promise<unknown>;
};
export declare function processSpeculateOperation(internals: EngineInternals, workflowId: string, operation: SpeculateOperation, callbacks: SpeculateOperationCallbacks): Promise<void>;
export declare function executeSpeculativeBranch(internals: EngineInternals, workflowId: string, operation: SpeculateOperation, callbacks: Pick<SpeculateOperationCallbacks, 'executeSubOperation'>): Promise<unknown>;
export declare function driveSpeculativeGenerator(workflowId: string, generator: SpeculativeOperationGenerator, speculativeState: SpeculativeExecutionState, callbacks: Pick<SpeculateOperationCallbacks, 'executeSubOperation'>, observeChild?: (operation: ContextOperationRequest, index: number, error?: unknown) => void): Promise<unknown>;
export {};