import type { FabricSpeculationStats } from "../speculation/types.js";
declare const PLANS: readonly ["admit", "skip", "ended"];
declare const OUTCOMES: readonly ["ready", "absent", "epoch", "freshness", "failed"];
declare const EVENTS: readonly ["launched", "served", "epochInvalidated", "freshnessInvalidated", "failed", "wasted", "skipped", "bump"];
export type SpeculationEvent = typeof EVENTS[number];
export declare const admitSpeculation: (input: {
    ended: boolean;
    duplicate: boolean;
    entries: number;
    inFlight: number;
    maxEntries: number;
    maxConcurrent: number;
}) => (typeof PLANS)[number];
export interface SpeculationObservation {
    settled: boolean;
    aborted: boolean;
    now: number;
    createdAt: number;
    ttl: number;
    birthEpoch: number;
    epoch: number;
    fresh: boolean;
    failed: boolean;
}
export declare const checkSpeculation: (input: SpeculationObservation) => (typeof OUTCOMES)[number];
/** Expiry-only sweep uses the same compiled TTL predicate, without callbacks. */
export declare const speculationExpired: (now: number, createdAt: number, ttl: number) => boolean;
/** The store owns this compiled state. No mutable statistics escape. */
export declare class SpeculationAccounting {
    #private;
    get epoch(): number;
    record(event: SpeculationEvent): void;
    stats(): FabricSpeculationStats;
}
export {};
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