import { Option } from '@commander-js/extra-typings';
import { Chapter, Language, LanguageOptions, SourceLanguages, Variant } from '../langs';
import type { Context, Result } from '../types';
import type { FileGetter } from '../modules/moduleTypes';
/**
 * Converts a string to the corresponding Source chapter. Throws an error if the string
 * doesn't represent a valid string.
 */
export declare function chapterParser(str: string): Chapter;
/**
 * Returns an {@link Option} for selecting Source chapters.
 */
export declare function getChapterOption(): Option<'--chapter <chapter>', undefined, Chapter.SOURCE_4, undefined, false, Chapter>;
export declare function getChapterOption<T extends Chapter, U extends T>(defaultValue: U, argParser: (value: string) => T): Option<'--chapter <chapter>', undefined, U, undefined, false, T>;
export declare function getVariantOption<T extends Variant>(defaultValue: T, choices: T[]): Option<"--variant <variant>", undefined, T, undefined, false, T>;
export declare const getLanguageOption: <T extends LanguageOptions>() => Option<"--languageOptions <options>", undefined, {}, LanguageOptions, false, undefined>;
export declare function handleResult(result: Result, context: Context, verboseErrors: boolean): string;
export declare function assertLanguageCombo(combo: Language): asserts combo is SourceLanguages;
export declare const nodeFileGetter: FileGetter;