import type { BackendObservability, GenerateResponse, RequestObservabilityMetrics, TransportObservability } from '../engine/inference-types.js';
import type { BackendProfileObservation, EngineEvent, EngineObservability, EngineState, EmbeddingResult, FinishReason, ObservabilityEvent, ObservabilityEventType, ObservabilitySnapshot, GenerationResult, RuntimeObservation, WebGpuAdapterInfo } from './types.js';
type SnapshotPatch = Partial<Omit<ObservabilitySnapshot, 'updatedAt' | 'runtime' | 'profile'> & {
    runtime: RuntimeObservation | null | undefined;
    profile: BackendProfileObservation | null | undefined;
}>;
export declare function toRuntimeObservation(metrics: RequestObservabilityMetrics | null, transport: TransportObservability): RuntimeObservation | undefined;
export declare function toBackendProfileObservation(backend: BackendObservability | null, webgpuAdapter?: WebGpuAdapterInfo | null): BackendProfileObservation | undefined;
export declare function observabilityEventToStateEvent(event: ObservabilityEvent): EngineEvent;
export declare function observabilitySnapshotToEngineState(snapshot: ObservabilitySnapshot): EngineState;
export declare function generationResultFromGenerateResponse(response: GenerateResponse, options?: {
    text?: string;
    maxTokens?: number;
    finishReason?: FinishReason;
}): GenerationResult;
export declare function generationResultFromText(input: {
    id: string | number;
    text: string;
    finishReason: FinishReason;
    metrics?: GenerateResponse['observability'] | null;
}): GenerationResult;
export declare function embeddingResultFromGenerateResponse(response: GenerateResponse): EmbeddingResult;
export declare class ObservabilityController implements EngineObservability {
    private snapshot;
    private readonly listeners;
    current(): ObservabilitySnapshot;
    subscribe(listener: (event: ObservabilityEvent) => void): () => void;
    emit(type: ObservabilityEventType, patch?: SnapshotPatch): void;
    ingest(event: ObservabilityEvent): void;
    update(patch?: SnapshotPatch): void;
    markClosed(): void;
    private buildSnapshot;
}
export {};