/**
 * Per-Account Quota Tracking
 *
 * Captures Anthropic rate-limit / utilisation headers from proxy responses
 * and persists them to ~/.neurolink/account-quotas.json so the CLI can
 * display remaining session & weekly capacity per account.
 *
 * Hot-path design: parseQuotaHeaders is pure CPU (no I/O). saveAccountQuota
 * updates an in-memory cache and debounces disk writes so the request/response
 * path is never blocked by file I/O.
 */
import type { AccountQuota, AccountQuotaWindow } from "../types/index.js";
/**
 * Collapse a wire model id to its family by dropping the snapshot date, so
 * `claude-fable-5-20260115` and `claude-fable-5-20260320` both tag the same
 * scoped window. Without this a window would stop matching the day Anthropic
 * ships a new snapshot.
 */
export declare function modelFamilyToken(model: string): string;
/** Read and normalize Anthropic's authoritative top-level unified status. */
export declare function getUnifiedRateLimitStatus(headers: Headers | Record<string, string>): string | undefined;
/**
 * Whether Anthropic explicitly permits a request to use overage after a
 * subscription window is exhausted. An active overage signal is authoritative;
 * otherwise fresh responses require explicit fallback and upgrade-path signals.
 * Older persisted snapshots predate those raw fields, but retain a positive
 * fallback percentage together with an allowed overage status, which is the
 * equivalent provider state.
 */
export declare function isQuotaOverageAvailable(quota: Pick<AccountQuota, "fallbackPercentage" | "fallbackStatus" | "overageStatus" | "overageInUse" | "overageEnabled" | "overageDisabledReason" | "upgradePaths"> | null | undefined): boolean;
/**
 * Parse Anthropic rate-limit / quota headers into an `AccountQuota`.
 * Returns `null` when key headers are absent.
 * Pure computation — no I/O, no blocking.
 */
export declare function parseQuotaHeaders(headers: Headers | Record<string, string>, opts?: {
    model?: string;
    now?: number;
}): AccountQuota | null;
/**
 * Merge dynamic limit windows across snapshots from different sources.
 *
 * The two sources see different things and neither is a superset: the usage API
 * reports every plan bucket but only when explicitly refreshed, while response
 * headers report only the window(s) touched by the request just served — but do
 * so continuously. A plain overwrite in either direction loses real data, which
 * is why a header capture used to erase the model-scoped windows a `/limits`
 * refresh had just fetched.
 */
export declare function mergeQuotaWindows(existing: AccountQuotaWindow[] | undefined, incoming: AccountQuotaWindow[] | undefined): AccountQuotaWindow[] | undefined;
/**
 * Fold a freshly observed snapshot onto the previous one for the same account,
 * preserving dynamic windows the new snapshot does not carry.
 */
export declare function mergeQuotaSnapshot(previous: AccountQuota | undefined, incoming: AccountQuota): AccountQuota;
/**
 * Initialise the quota module with a custom file path.
 * When set, all reads/writes go to this path instead of the default
 * ~/.neurolink/account-quotas.json. Call before the first load/save.
 */
export declare function initAccountQuota(quotaFilePath: string): void;
export declare function loadAccountQuotas(): Promise<Record<string, AccountQuota>>;
/**
 * Load quota for a single account.
 */
export declare function loadAccountQuota(accountKey: string): Promise<AccountQuota | null>;
/**
 * Update quota for a single account.
 * Updates in-memory cache immediately (non-blocking),
 * then debounces the disk write to every 5 seconds.
 *
 * Loads the persisted file into the cache before the first write so a save
 * after a process restart merges with existing entries instead of rewriting
 * the file with only the accounts used since boot (which silently erased
 * other accounts' snapshots and blinded quota-aware routing to them).
 */
export declare function saveAccountQuota(accountKey: string, quota: AccountQuota): Promise<void>;
/**
 * Cancel any pending debounced write and flush the cache to disk now.
 * Short-lived processes (CLI refresh path) must call this before exit —
 * the debounce timer is unref()'d and will not keep the process alive.
 */
export declare function flushAccountQuotas(): Promise<void>;
export declare function flushAccountQuotaStateForTests(): Promise<void>;