import type { UsageRecordedPacket } from "./packets.js";
import { type PriceCatalog } from "./pricing.js";
export interface SpendCapConfig {
    readonly maxUsd: number;
    readonly catalog?: PriceCatalog;
}
export interface SpendCapCheck {
    readonly exceeded: boolean;
    readonly spentUsd: number;
}
/**
 * Accumulates priced `usage.recorded` into session spend and reports whether a
 * configured USD cap has been breached. Does not call providers; the session
 * layer decides refuse/fallback from `check()`.
 */
export declare class SpendCapGuard {
    private readonly maxUsd;
    private readonly catalog;
    private spentUsd;
    private exceeded;
    constructor(cfg: SpendCapConfig);
    /** Observe one usage packet. Unpriced usage does not change spentUsd. */
    record(usage: UsageRecordedPacket): void;
    /** Read-only policy view — never mutates spend. */
    check(): SpendCapCheck;
}
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