/**
 * Proto ↔ SDK type conversion layer.
 *
 * Centralizes all conversions between gRPC/proto wire format and SDK types.
 * This isolates proto structure changes from the rest of the SDK.
 *
 * Payloads are passed as raw Buffers (no base64 round-trip) for performance.
 */
import type { WorkflowTaskPayload, ActivityTaskPayload, WorkflowCompletion, ActivityCompletion, WorkflowCommand } from '../types.js';
/** Convert a protobuf Timestamp to a Date after validating its canonical structure and range. */
export declare function timestampToDate(value: unknown, operation?: string, field?: string): Date;
type StepTypeName = 'UNSPECIFIED' | 'ACTIVITY' | 'CHILD_WORKFLOW' | 'TIMER' | 'SIDE_EFFECT' | 'SIGNAL_WAIT';
type StepStatusName = 'UNSPECIFIED' | 'STARTED' | 'COMPLETED' | 'FAILED';
type WorkflowStatusName = 'UNSPECIFIED' | 'RUNNING' | 'COMPLETED' | 'FAILED' | 'CANCELLED' | 'TIMED_OUT' | 'BLOCKED_NONDETERMINISTIC';
export declare function stepTypeToString(t: any): StepTypeName;
export declare function stepStatusToString(s: any): StepStatusName;
export declare function statusFromProto(status: any): WorkflowStatusName;
export declare function parseWorkflowTask(task: any, requireDeliveryIdentity?: boolean): WorkflowTaskPayload;
/** Parse a GetCheckpointsResponse (the lazy-hydration fetch, P0.4). */
export declare function parseCheckpointsResponse(resp: any): WorkflowTaskPayload['completed_steps'];
export declare function parseActivityTask(task: any, requireDeliveryIdentity?: boolean): ActivityTaskPayload;
export declare function cmdToProto(cmd: WorkflowCommand): any;
export declare function buildWorkflowCompletionRequest(taskToken: string, completion: WorkflowCompletion, deliveryIdentity?: unknown): any;
export declare function buildActivityCompletionRequest(taskToken: string, completion: ActivityCompletion, deliveryIdentity?: unknown): any;
export {};