import type { AckResult } from "./sessions.js";
export declare const RETRY_MS = 20000;
export declare const GIVEUP_MS: number;
export declare const HELD_REASON = "input line holds unsent text \u2014 not typed";
export declare const UNREADABLE_REASON = "could not read the target terminal \u2014 not typed";
export interface GuardDeps {
    /** Live pane text, or null when it cannot be read. */
    read(sessionId: string): Promise<string | null>;
    type(sessionId: string, text: string): Promise<AckResult>;
    mailboxSize(sessionId: string): number;
    now(): number;
    setTimer(fn: () => void, ms: number): {
        unref?: () => void;
    } | unknown;
    clearTimer(t: unknown): void;
}
export declare const realGuardDeps: GuardDeps;
export type GuardResult = {
    typed: true;
    ack: AckResult;
} | {
    typed: false;
    reason: string;
};
/** Test hook: forget all pending retries. */
export declare function resetPointerGuard(deps?: GuardDeps): void;
/**
 * Type `text` into the session only if its input line is empty.
 *
 * `multi` builds the single line typed instead when several messages have
 * piled up behind a held line ("N messages"); omit it for text that is not a
 * mailbox pointer (it is then retried as-is).
 */
export declare function typeWhenInputEmpty(sessionId: string, text: string, opts?: {
    multi?: (n: number) => string;
}, deps?: GuardDeps): Promise<GuardResult>;
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