import type { RShellExecutionOptions } from './shell';
import type { SemVer } from 'semver';
import type { SyncParser } from './parser';
import { type RParseRequest } from './retriever';
/**
 * This is a synchronous alternative to the {@link RShell}.
 * Please be aware that using this is expensive.
 * Every request effectively causes a new initialization of the R interpreter.
 *
 * With this class you can {@link RShellExecutor#run|run(command)} commands,
 * that are potentially decorated with {@link RShellExecutor#addPrerequisites|prerequisites}.
 * For compatibility,
 * we provide {@link RShellExecutor#parse|parse(request)} and {@link RShellExecutor#rVersion|rVersion()}.
 */
export declare class RShellExecutor implements SyncParser<string> {
    readonly name = "r-shell";
    readonly options: Readonly<RShellExecutionOptions>;
    private readonly prerequisites;
    constructor(options?: Partial<RShellExecutionOptions>);
    /**
     * Adds commands that should be executed for every {@link RShellExecutor#run|run}.
     */
    addPrerequisites(commands: string | string[]): this;
    /**
     * @returns the version of the R interpreter available to this executor.
     *
     * @see {@link RShellExecutor#usedRVersion}
     * @see {@link RShell#rVersion}
     * @see {@link RShell#usedRVersion}
     */
    rVersion(): Promise<string | 'unknown' | 'none'>;
    /**
     * Instead of returning a promise, this method returns the version of the R interpreter available to this executor,
     * in the SemVer format.
     */
    usedRVersion(): SemVer | null;
    /**
     * Runs the given command in the R interpreter.
     */
    run(command: string, returnErr?: boolean): string;
    /**
     * Parses the given request and returns the result.
     */
    parse(request: RParseRequest): string;
    close(): void;
}