/** @hidden */
export declare function assert(message: string, condition: boolean): void;
/** @hidden */
export declare function assertObservableIsProperty(x: any): void;
/** @hidden */
export declare function assertEventStream(event: any): void;
/** @hidden */
export declare function assertObservable(observable: any): void;
/** @hidden */
export declare function assertFunction(f: Function | undefined): void;
/** @hidden */
export declare function assertArray(xs: any[]): void;
/** @hidden */
export declare function assertNoArguments(args: IArguments): void;