import type { Metadata } from '@midwayjs/grpc';
import type { Context as Context, GrpcContext, NextFunction } from '@mwcp/share';
import { RpcMethodType } from '@mwcp/share';
import type { TextMapGetter, TextMapSetter } from '@opentelemetry/api';
import type { TraceService } from '../../lib/index.js';
/**
 * Catch and sample top exception if __isTraced is false or undefined,
 * ex will NOT be thrown again
 */
export declare function handleTopExceptionAndNext(ctx: GrpcContext, traceSvc: TraceService, next: NextFunction): Promise<object | Error>;
/**
 * Catch and sample exception,
 * re-throw ex
 */
export declare function handleAppExceptionAndNext(webCtx: Context, traceSvc: TraceService, next: NextFunction): Promise<unknown>;
export declare const metadataSetter: TextMapSetter<NonNullable<GrpcContext['metadata']>>;
export declare const metadataGetter: TextMapGetter<Metadata>;
export declare function detectRpcMethodType(ctx: GrpcContext): RpcMethodType.unary | RpcMethodType.bidi;
export declare function isGrpcContextFinished(ctx: GrpcContext): boolean;