import { Observable } from "rxjs";
export declare function queue<T1>(s1: Observable<T1>): [Observable<T1>];
export declare function queue<T1, T2>(s1: Observable<T1>, s2: Observable<T2>): [Observable<T1>, Observable<T2>];
export declare function queue<T1, T2, T3>(s1: Observable<T1>, s2: Observable<T2>, s3: Observable<T3>): [Observable<T1>, Observable<T2>, Observable<T3>];
export declare function queue<T1, T2, T3, T4>(s1: Observable<T1>, s2: Observable<T2>, s3: Observable<T3>, s4: Observable<T4>): [Observable<T1>, Observable<T2>, Observable<T3>, Observable<T4>];
export declare function queue<T1, T2, T3, T4, T5>(s1: Observable<T1>, s2: Observable<T2>, s3: Observable<T3>, s4: Observable<T4>, s5: Observable<T5>): [
    Observable<T1>,
    Observable<T2>,
    Observable<T3>,
    Observable<T4>,
    Observable<T5>
];
export declare function queue<T1, T2, T3, T4, T5, T6>(s1: Observable<T1>, s2: Observable<T2>, s3: Observable<T3>, s4: Observable<T4>, s5: Observable<T5>, s6: Observable<T6>): [
    Observable<T1>,
    Observable<T2>,
    Observable<T3>,
    Observable<T4>,
    Observable<T5>,
    Observable<T6>
];
export declare function queue<R = any>(...sources: Observable<any>[]): Observable<R>[];