/**
 * Shared timing contracts for the SQLite-to-Sheets write pipeline.
 *
 * The outbox package owns the core timing shapes (events, operation kinds,
 * counts, provider timing, and the worker/provider scopes); this host module
 * re-exports them under the host names and adds the host-only `orm_flush`
 * and `polling` scopes. Timing is diagnostic only: a sink failure must never
 * change persistence or provider behavior. The operation kinds describe the
 * public lifecycle while phases describe implementation boundaries that can
 * be compared in a trace.
 */
import { type ProviderTiming, type TimingEvent, type TimingOperationCounts, type TimingOperationKind } from "@hikoutei/ikisaki";
/** Host diagnostic scopes: the package worker/provider scopes plus host-only phases. */
export declare const SYNC_TIMING_SCOPES: {
    /** Inbound User_Input polling phases; diagnostic only and never root-facing. */
    readonly POLLING: "polling";
    readonly WORKER: "worker";
    readonly PROVIDER: "provider";
    readonly ORM_FLUSH: "orm_flush";
};
export type SyncTimingScope = (typeof SYNC_TIMING_SCOPES)[keyof typeof SYNC_TIMING_SCOPES];
/** Lifecycle operation kinds counted by timing events (package-owned). */
export declare const SYNC_TIMING_OPERATION_KINDS: {
    readonly APPEND: "append";
    readonly UPDATE: "update";
    readonly DELETE: "delete";
};
export type SyncTimingOperationKind = TimingOperationKind;
/** Count of lifecycle operations represented by one timing event. */
export type SyncTimingOperationCounts = TimingOperationCounts;
/** Timing returned by one remote provider operation. */
export type SyncSheetsTiming = ProviderTiming;
/** One local or remote phase sent to the application's diagnostics sink. */
export type SyncTimingEvent = Omit<TimingEvent, "scope"> & {
    readonly scope: SyncTimingScope;
};
/** Optional observer used by servers and benchmarks to collect timings. */
export type SyncTimingSink = (event: SyncTimingEvent) => void;
/** Creates a zeroed operation count without sharing mutable state. */
export declare function emptySyncTimingOperationCounts(): SyncTimingOperationCounts;
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