import { Observable } from 'rxjs';
export declare function memoize<T, Arg1>(fn: (arg1: Arg1) => Observable<T>, keyGen: (arg1: Arg1) => string): (arg1: Arg1) => Observable<T>;
export declare function memoize<T, Arg1, Arg2>(fn: (arg1: Arg1, arg2: Arg2) => Observable<T>, keyGen: (arg1: Arg1, arg2: Arg2) => string): (arg1: Arg1, arg2: Arg2) => Observable<T>;
export declare function memoize<T, Arg1, Arg2, Arg3>(fn: (arg1: Arg1, arg2: Arg2, arg3: Arg3) => Observable<T>, keyGen: (arg1: Arg1, arg2: Arg2, arg3: Arg3) => string): (arg1: Arg1, arg2: Arg2, arg3: Arg3) => Observable<T>;
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