/**
 * Throws an exception when attempting to attach a null portal to a host.
 * @docs-private
 */
export declare function throwNullPortalError(): void;
/**
 * Throws an exception when attempting to attach a portal to a host that is already attached.
 * @docs-private
 */
export declare function throwPortalAlreadyAttachedError(): void;
/**
 * Throws an exception when attempting to attach a portal to an already-disposed host.
 * @docs-private
 */
export declare function throwPortalHostAlreadyDisposedError(): void;
/**
 * Throws an exception when attempting to attach an unknown portal type.
 * @docs-private
 */
export declare function throwUnknownPortalTypeError(): void;
/**
 * Throws an exception when attempting to attach a portal to a null host.
 * @docs-private
 */
export declare function throwNullPortalHostError(): void;
/**
 * Throws an exception when attempting to detach a portal that is not attached.
 * @docs-privatew
 */
export declare function throwNoPortalAttachedError(): void;