/**
 * @fileoverview DiagnosticsBag Implementation (SPEC Section 5.5)
 *
 * Concrete implementation of DiagnosticsBag for pipeline operations.
 *
 * @module pipeline/diagnostics-bag
 */
import type { DiagnosticsBag, Diagnostic } from "../core/types/diagnostics.js";
/**
 * Concrete implementation of DiagnosticsBag.
 *
 * Thread-safe for parallel operations via atomic operations.
 */
export declare class DiagnosticsBagImpl implements DiagnosticsBag {
    private readonly _warnings;
    private readonly _infos;
    private readonly _metrics;
    private readonly _metricObservations;
    /**
     * Add warning.
     */
    warn(code: string, message: string, nodeId?: string): void;
    /**
     * Add info.
     */
    info(code: string, message: string, nodeId?: string): void;
    /**
     * Record metric (last-write-wins).
     *
     * Per PLG-10: Non-deterministic in parallel chunk hooks.
     */
    metric(name: string, value: number): void;
    /**
     * Accumulate metric (sum aggregation).
     * Safe for parallel chunk hooks.
     */
    metricAdd(name: string, delta: number): void;
    /**
     * Observe metric (histogram/average).
     *
     * Per DIAG-OBS-1: May grow unbounded.
     */
    metricObserve(name: string, value: number): void;
    /**
     * Read-only access to warnings.
     */
    get warnings(): readonly Diagnostic[];
    /**
     * Read-only access to infos.
     */
    get infos(): readonly Diagnostic[];
    /**
     * Read-only access to metrics.
     */
    get metrics(): ReadonlyMap<string, number>;
    /**
     * Read-only access to metric observations.
     */
    get metricObservations(): ReadonlyMap<string, readonly number[]>;
    /**
     * Create a snapshot for read-only access.
     */
    toReadonly(): DiagnosticsBag;
    /**
     * Clear all diagnostics.
     */
    clear(): void;
}
/**
 * Create a new DiagnosticsBag.
 */
export declare function createDiagnosticsBag(): DiagnosticsBagImpl;
//# sourceMappingURL=diagnostics-bag.d.ts.map