/** @internal Raised when a bounded wait exceeds its deadline. */
export declare class WaitTimeoutError extends Error {
    constructor();
}
/** @internal Raised when an operation times out. */
export declare class TimeoutError extends Error {
    constructor();
}
/** @internal Raised when an operation is cancelled. */
export declare class CancelledError extends Error {
    constructor();
}
/** @internal Raised when putting onto a full bounded queue. */
export declare class QueueFull extends Error {
    constructor();
}