import { type CodexSpend, type SpendSummary, type UsageAccount, type UsageLedger, type UsagePeriod } from "./ledger-schema.ts";
import type { CodexUsageSnapshot } from "./payload.ts";
export declare const WEEK_MS: number;
export declare function usageAccount(ledger: UsageLedger, key: string, at: number): UsageAccount;
export declare function addSpend(summary: SpendSummary, spend: CodexSpend, sign?: number): void;
export declare function addSummary(target: SpendSummary, value: SpendSummary): void;
export declare function recordSpend(account: UsageAccount, spend: CodexSpend): void;
export declare function estimatedQuota(period: UsagePeriod): number | undefined;
export declare function observeWeeklyUsage(account: UsageAccount, snapshot: CodexUsageSnapshot, at: number): void;