import { Observable } from 'rxjs';
export declare class CommandsBasicsStrings {
    constructor();
    asc(string: string): Observable<number>;
    chr(value: number): Observable<string>;
    instr(text: string, search: string, start: number): Observable<number>;
    left(text: string, count: number): Observable<string>;
    len(text: string): Observable<number>;
    lower(text: string): Observable<string>;
    lset(text: string, count: number): Observable<string>;
    mid(text: string, start: number, count: number): Observable<string>;
    replace(text: string, search: string, replace: string): Observable<string>;
    right(text: string, count: number): Observable<string>;
    rset(text: string, count: number): Observable<string>;
    str(value: number): Observable<string>;
    string(text: string, count: number): Observable<string>;
    trim(text: string): Observable<string>;
    upper(text: string): Observable<string>;
}