/**
 * Read-only aggregations over observability events.
 *
 * Slice B of v2.11.1. Pure functions over `readonly ObservabilityEvent[]`
 * — the CLI layer reads events via `readObservabilityEvents` (or
 * `listSessionDirsWithMetrics` for cross-session rollups) and passes
 * them in. Tests pass synthetic events directly.
 *
 * Aggregations:
 *
 * The dispatch / mode-gate / context / post-compact categories land
 * in Slice C (more hooks); for Slice B only `slice-transition` events
 * are emitted from the `peaks request transition` hook. Slice B
 * builds the read-side surface so Slice C is purely additive.
 */
import { type ObservabilityEvent } from './observability-service.js';
import { type DashboardMetrics, type FanoutBreakdown, type Period, type RepairCycleReport, type SliceRollup, type StatusAggregate } from './aggregation-types.js';
export { REPAIR_CYCLE_CAP } from './aggregation-types.js';
export { REPAIR_CYCLE_METRIC_VERSION } from './repair-cycle-metric.js';
export { readAllSessionEvents, readSessionEvents } from './aggregation-helpers.js';
export type { DashboardMetrics, FanoutBreakdown, LegacyQaEventCount, Period, QaRoundSummary, RepairCycleReport, SliceRollup, StatusAggregate } from './aggregation-types.js';
export declare function aggregateStatus(events: readonly ObservabilityEvent[]): StatusAggregate;
export declare function aggregateSlices(events: readonly ObservabilityEvent[]): SliceRollup[];
export declare function aggregateFanout(events: readonly ObservabilityEvent[]): FanoutBreakdown;
export declare function aggregateRepairCycles(events: readonly ObservabilityEvent[]): RepairCycleReport;
export declare function periodStartIso(period: Period, now?: () => Date): string;
export declare function filterByPeriod(events: readonly ObservabilityEvent[], period: Period, now?: () => Date): ObservabilityEvent[];
/**
 * Aggregate the 5 dashboard metric classes for a single session, filtered
 * to events with `ts >= since`. Events with unparseable timestamps are
 * counted (best-effort, mirrors `readObservabilityEvents` behavior). The
 * `token-usage` total is summed from `detail.totalTokens` (falling back to
 * `inputTokens + outputTokens` when the aggregate field is missing).
 */
export declare function aggregateDashboardMetrics(projectRoot: string, sessionId: string, since: Date): DashboardMetrics;
/**
 * Pure-function variant used by tests: counts across an already-loaded
 * event list. `since` may be null to count everything.
 */
export declare function aggregateDashboardMetricsFromEvents(events: readonly ObservabilityEvent[], since?: Date | null): DashboardMetrics;