import type { DiagnosticsOperation, DiagnosticsStage, DiagnosticsOutcome, DiagnosticsReason, DiagnosticsRow, DiagnosticsSnapshot } from './diagnostics-types.ts';
export interface DiagnosticsHandle {
    stage(stage: DiagnosticsStage): void;
    finish(outcome: DiagnosticsOutcome, reason?: DiagnosticsReason): void;
}
export declare function emptyDiagnostics(): DiagnosticsSnapshot;
/** Only fixed dimensions cross this boundary; live handles never leave the owner. */
export declare class DiagnosticsCollector {
    readonly version: string;
    readonly layer: 'client' | 'host';
    private readonly changed;
    private readonly wall;
    private readonly mono;
    private data;
    private readonly live;
    private enabled;
    private lastWall;
    constructor(version: string, layer: 'client' | 'host', changed?: () => void, wall?: () => number, mono?: () => number);
    restore(snapshot: DiagnosticsSnapshot): void;
    setEnabled(enabled: boolean): void;
    assertCanEnable(): void;
    clear(): void;
    begin(operation: DiagnosticsOperation): DiagnosticsHandle;
    private settle;
    private age;
    private increment;
    private expire;
    private add;
    private oldestIndex;
    snapshot(): DiagnosticsSnapshot;
    close(): void;
    noteDropped(): void;
    noteClientGaps(dropped: number, unconfirmed: number): void;
    mergeClient(rows: readonly DiagnosticsRow[]): void;
}
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