/** Provider slug this reading is attributed to; matches the gateway route and profile provider. */
export declare const CODEX_PROVIDER = "openai-codex";
export interface QuotaWindow {
    /** `seven_day` / `five_hour`, else `window_<minutes>m` for a length Codex has not used before. */
    type: string;
    /** Fraction in [0,1] — Codex reports whole percents, the throttle compares against 0.95. */
    utilization: number;
    /** Epoch seconds, matching the persisted provider-state shape. */
    resetsAt: number;
}
export interface CodexQuotaReading {
    provider: typeof CODEX_PROVIDER;
    planType: string | null;
    windows: QuotaWindow[];
}
export interface ParseQuotaOpts {
    /** Injected clock: reset-after-seconds is relative, so the caller pins the reference point. */
    nowMs: number;
}
/**
 * Extract the quota state Codex broadcasts on every response. Returns null when the response
 * carries no usable window — a non-Codex response, a fully disabled bucket, or a malformed
 * reading. Null means "learned nothing", never "quota is fine".
 */
export declare function parseCodexQuotaHeaders(headers: Record<string, string>, opts: ParseQuotaOpts): CodexQuotaReading | null;
export declare function encodeQuotaNotice(reading: CodexQuotaReading): string;
/** Returns null for anything that is not a well-formed quota notice — an ordinary notification,
 *  a truncated payload, or a reading with no window. Callers treat null as "not for us". */
export declare function decodeQuotaNotice(message: unknown): CodexQuotaReading | null;