export declare const DEVICE_ISOLATION_ACTIVATION_VERSION: 1;
export declare const DEVICE_ISOLATION_FREEZE_LEASE_MS = 30000;
export interface DeviceIsolationFreezeLease {
    activationVersion: typeof DEVICE_ISOLATION_ACTIVATION_VERSION;
    leaseId: string;
    nonce: string;
    inventoryGeneration: string;
    acquiredAt: number;
    expiresAt: number;
}
export declare function currentDeviceIsolationFreezeLease(now?: number): DeviceIsolationFreezeLease | null;
export type AcquireDeviceIsolationFreezeResult = {
    ok: true;
    lease: DeviceIsolationFreezeLease;
    reused: boolean;
} | {
    ok: false;
    reason: 'busy';
};
export declare function acquireDeviceIsolationFreeze(input: {
    nonce: string;
    inventoryGeneration: string;
    now?: number;
    leaseMs?: number;
    leaseIdFactory?: () => string;
}): AcquireDeviceIsolationFreezeResult;
export declare function requireDeviceIsolationFreeze(input: {
    nonce: string;
    leaseId: string;
    now?: number;
}): DeviceIsolationFreezeLease | null;
/**
 * Bind the post-freeze inventory to the lease. Prepare must acquire the spawn
 * barrier before it looks at sessions; otherwise a worker can appear between
 * inventory and freeze. Only the holder may replace the provisional value.
 */
export declare function bindDeviceIsolationFreezeInventoryGeneration(input: {
    nonce: string;
    leaseId: string;
    inventoryGeneration: string;
    now?: number;
}): DeviceIsolationFreezeLease | null;
export declare function releaseDeviceIsolationFreeze(input: {
    nonce: string;
    leaseId: string;
    now?: number;
}): boolean;
/**
 * Queue only the first spawn request for a logical session. Later turns are
 * already retained by the session's normal pending-input machinery; replaying
 * multiple fork requests would instead kill and replace the first new worker.
 */
export declare function deferWorkerSpawnDuringDeviceIsolation(sessionId: string, callback: () => void, now?: number): boolean;
/** Test-only reset; production callers release through the lease protocol. */
export declare function resetDeviceIsolationActivationForTest(): void;
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