import { SoftwarePackage } from '@stencila/schema';
import PackageGenerator from './PackageGenerator';
import IUrlFetcher from './IUrlFetcher';
/**
 * A Dockerfile generator for R packages
 */
export default class RGenerator extends PackageGenerator {
    /**
     * Date used to pin the CRAN mirror used
     */
    date: string;
    constructor(urlFetcher: IUrlFetcher, pkg: SoftwarePackage, folder?: string);
    applies(): boolean;
    envVars(sysVersion: string): Array<[string, string]>;
    aptKeysCommand(sysVersion: string): string;
    aptRepos(base: string): Array<string>;
    aptPackages(sysVersion: string): Array<string>;
    stencilaInstall(sysVersion: string): string | undefined;
    installFiles(sysVersion: string): Array<[string, string]>;
    installCommand(sysVersion: string): string | undefined;
    /**
     * The files to copy into the Docker image
     *
     * Copies all `*.R` files to the container
     */
    projectFiles(): Array<[string, string]>;
    /**
     * The command to execute in a container created from the Docker image
     *
     * If there is a top-level `main.R` or `cmd.R` then that will be used,
     * otherwise, the first `*.R` files by alphabetical order will be used.
     */
    runCommand(): string | undefined;
}