/**
 * hosting/signin/memorySignIns — the bounded in-memory {@link SignInStore}.
 *
 * Bounded (rule 19), and fair — one person can never sign everybody else out
 * (review idI34 S-1):
 *
 *  - **A per-account cap** (default 10 live sign-ins per `userId`). A person's
 *    eleventh sign-in ends THAT person's oldest; nobody else's.
 *  - **Dead rows are swept** before anything is counted — past their lifetime,
 *    or idle longer than `idleMinutes` when given (the door's own idle limit;
 *    review idI57 N-12) — so dead sign-ins never crowd out live ones.
 *  - **A full store REFUSES** a new sign-in ({@link SignInStoreFullError}, the
 *    door answers 503) rather than evicting another account's live sign-in.
 *  - **Every end is announced** through `onDelete`, which `signInSource` turns
 *    into its `onEnd` — so a socket carrying an ended sign-in closes at once.
 *
 * Per process, and stated: a restart signs everybody out, and a second replica
 * does not know the first one's sign-ins. Run one replica, pin each browser to
 * one (sticky sessions), or put a shared store behind the same verbs.
 */
import type { SignInStore } from './types.js';
export { MemorySignInsConfigError } from './errors.js';
export interface MemorySignInsOptions {
    /** The most live sign-ins kept at once. Default 10 000. */
    readonly max?: number;
    /** The most live sign-ins one account may hold. Default 10. */
    readonly perAccount?: number;
    /**
     * Minutes without use after which a row is dead — pass the door's
     * `idleMinutes` so an idle sign-in stops holding a place against `max`.
     * Absent: only the lifetime (`expiresAt`) is swept.
     */
    readonly idleMinutes?: number;
    /** The clock, epoch ms, for sweeping expired rows. Default `Date.now`. */
    readonly now?: () => number;
    /** Told once when the store passes 90 % of `max`. Default: `console.warn`. */
    readonly warn?: (message: string) => void;
}
/** The in-memory store, plus what a banner or a test needs to read. */
export interface MemorySignIns extends SignInStore {
    /** How many sign-ins are kept right now. */
    readonly size: number;
    /** The cap. */
    readonly max: number;
    /** The per-account cap. */
    readonly perAccount: number;
    onDelete(listener: (key: string) => void): () => void;
}
export declare const DEFAULT_SIGN_IN_MAX = 10000;
export declare const DEFAULT_SIGN_INS_PER_ACCOUNT = 10;
export declare function memorySignIns(options?: MemorySignInsOptions): MemorySignIns;