import { type Attributes, type Context, type Tracer } from '@opentelemetry/api';
import type { OtelClientConfig, EventType, OtelClientSpan, OtelClientStepSpan, CloudEvent } from './types';
import { TraceStep } from './trace-step';
import type { CloudEventMapperResult, CloudEventMapperDataItem, CloudEventMapperSubjectsArray } from '../../cloudEvents';
type ItemWithObject = {
    object: string;
    [key: string]: unknown;
};
export declare const BUS_STYLE_SNAPSHOT_CONTEXT_KEY: 'context';
export type GroupedItems = {
    updated: ItemWithObject[];
    notUpdated: ItemWithObject[];
};
/** Item shape from event.data array or event.subjects (CloudEvent source of truth) */
type GroupableItem = CloudEventMapperDataItem | CloudEventMapperSubjectsArray[number];
/**
 * Groups items by their `object` property, detecting before/after pairs.
 * Used for event data (CloudEventMapperDataItem[]) and subjects (CloudEventMapperSubjectsArray).
 */
export declare function groupByObjectProperty(items: Array<GroupableItem | unknown>): GroupedItems;
export type CloudEventBaseAttributes = Record<string, string | number | undefined>;
/**
 * Processes a CloudEvent into OpenTelemetry span attributes.
 * CloudEventMapperResult is the single source of truth (from cloudEvents/mapper).
 */
export declare function processCloudEventAttributes(cloudEvent: CloudEventMapperResult, time: Date, config?: OtelClientConfig | null): Attributes;
/**
 * Processes event data object into CloudEvents event_data attributes.
 * Exported for use by ReporterTelemetryClient.
 */
export declare function processObjectData(eventData: Record<string, unknown>, attributes: Attributes): void;
/** @deprecated Use OtelClientConfig */
export type ProcessCloudEventAttributesConfig = OtelClientConfig;
/**
 * Processes CloudEvent attributes for OpenTelemetry spans.
 * CloudEvent<T> extends CloudEventMapperResult, so typed events are accepted.
 */
export declare function processAttributes(cloudEvent: CloudEventMapperResult, time: Date, config?: OtelClientConfig | null): Attributes;
export declare class BaseOtelClient {
    protected config: OtelClientConfig | null;
    tracer: Tracer | null;
    protected tracerProvider: any | null;
    protected initialized: boolean;
    sessionId: string | null;
    protected initTracer(_config: OtelClientConfig): void;
    init(config: OtelClientConfig): void;
    send<T extends EventType = EventType>(cloudEvent: CloudEvent<T>): void;
    processAttributes<T extends EventType = EventType>(cloudEvent: CloudEvent<T>, time: Date): Attributes;
    startSpan<T extends EventType = EventType>(cloudEvent: CloudEvent<T>, parentCtx?: Context): OtelClientSpan<T> | undefined;
    startStepSpan<T extends EventType = EventType>(cloudEvent: CloudEvent<T>, parentCtx?: Context): OtelClientStepSpan<T> | undefined;
    traceStep<T extends EventType = EventType>(cloudEvent: CloudEvent<T>): TraceStep<T> | undefined;
    forceFlush(): Promise<void>;
    shutdown(): Promise<void>;
}
export {};