type TrimRight<S extends string> = S extends `${infer R} ` ? TrimRight<R> : S;
type TrimLeft<S extends string> = S extends ` ${infer R}` ? TrimLeft<R> : S;
type Trim<S extends string> = TrimLeft<TrimRight<S>>;

type CamelCase<S extends string> = S extends `${infer W}-${infer Rest}`
  ? CamelCase<`${W}${Capitalize<Rest>}`>
  : S;

// This is a trick to encourage TypeScript to resolve intersections for displaying,
// like { a: number } & { b : string } => { a: number, b: string }
// References:
// - https://github.com/sindresorhus/type-fest/blob/main/source/simplify.d.ts
// - https://effectivetypescript.com/2022/02/25/gentips-4-display/
type Resolve<T> = T extends infer O ? { [K in keyof O]: O[K] } : never;

// This is a trick to encourage editor to suggest the known literals while still
// allowing any BaseType value.
// References:
// - https://github.com/microsoft/TypeScript/issues/29729
// - https://github.com/sindresorhus/type-fest/blob/main/source/literal-union.d.ts
// - https://github.com/sindresorhus/type-fest/blob/main/source/primitive.d.ts
type LiteralUnion<LiteralType, BaseType extends string | number> = LiteralType | (BaseType & Record<never, never>);

// Side note: not trying to represent arrays as non-empty, keep it simple.
// https://stackoverflow.com/a/56006703/1082434
type InferVariadic<S extends string, ArgT> =
  S extends `${string}...`
    ? ArgT[]
    : ArgT;

type InferArgumentType<Value extends string, DefaultT, CoerceT, ChoicesT> =
  [CoerceT] extends [undefined]
    ? InferVariadic<Value, [ChoicesT] extends [undefined] ? string : ChoicesT> | DefaultT
    : ([ChoicesT] extends [undefined]
      ? CoerceT | DefaultT
      : CoerceT | DefaultT | ChoicesT
    )


// Special handling for optional variadic argument, won't be undefined as implementation returns [].
type InferArgumentOptionalType<Value extends string, DefaultT, CoerceT, ChoicesT> =
  Value extends `${string}...`
    ? InferArgumentType<Value, [DefaultT] extends [undefined] ? never : DefaultT, CoerceT, ChoicesT>
    : InferArgumentType<Value, DefaultT, CoerceT, ChoicesT>

// ArgRequired comes from .argRequired()/.argOptional(), and ArgRequiredFromUsage is implied by usage <required>/[optional]
type ResolveRequired<ArgRequired extends boolean|undefined, ArgRequiredFromUsage extends boolean> =
  ArgRequired extends undefined
    ? ArgRequiredFromUsage
    : ArgRequired;

type InferArgumentTypeResolvedRequired<Value extends string, DefaultT, CoerceT, ArgRequired extends boolean, ChoicesT> =
  ArgRequired extends true
    ? InferArgumentType<Value, never, CoerceT, ChoicesT>
    : InferArgumentOptionalType<Value, DefaultT, CoerceT, ChoicesT>;

// Resolve whether argument required, and strip []/<> from around value.
type InferArgument<S extends string, DefaultT = undefined, CoerceT = undefined, ArgRequired extends boolean|undefined = undefined, ChoicesT = undefined> =
  S extends `<${infer Value}>`
    ? InferArgumentTypeResolvedRequired<Value, DefaultT, CoerceT, ResolveRequired<ArgRequired, true>, ChoicesT>
    : S extends `[${infer Value}]`
      ? InferArgumentTypeResolvedRequired<Value, DefaultT, CoerceT, ResolveRequired<ArgRequired, false>, ChoicesT>
      : InferArgumentTypeResolvedRequired<S, DefaultT, CoerceT, ResolveRequired<ArgRequired, true>, ChoicesT>; // the implementation fallback is treat as <required>

type InferArguments<S extends string> =
    S extends `${infer First} ${infer Rest}`
        ? [InferArgument<First>, ...InferArguments<TrimLeft<Rest>>]
        : [InferArgument<S>];

type InferCommmandArguments<S extends string> =
  S extends `${string} ${infer Args}`
      ? InferArguments<TrimLeft<Args>>
      : [];

type FlagsToFlag<Flags extends string> =
    Flags extends `${string},${infer LongFlag}`
        ? TrimLeft<LongFlag>
        : Flags extends `${string}|${infer LongFlag}`
        ? TrimLeft<LongFlag>
        : Flags extends `${string} ${infer LongFlag}`
            ? TrimLeft<LongFlag>
            : Flags;

type ConvertFlagToName<Flag extends string> =
    Flag extends `--no-${infer Name}`
        ? CamelCase<Name>
        : Flag extends `--${infer Name}`
        ? CamelCase<Name>
        : Flag extends `-${infer Name}`
            ? CamelCase<Name>
            : never;

type CombineOptions<Options, O> =
    keyof O extends keyof Options
        ? { [K in keyof Options]: K extends keyof O ? Options[K] | O[keyof O] : Options[K] }
        : Options & O;

type IsAlwaysDefined<DefaulT, Mandatory extends boolean> =
    Mandatory extends true
        ? true
        : [undefined] extends [DefaulT]
            ? false
            : true;

// Modify PresetT to take into account negated.
type NegatePresetType<Flag extends string, PresetT> =
    Flag extends `--no-${string}`
        ? undefined extends PresetT ? false : PresetT
        : undefined extends PresetT ? true : PresetT;
          
// Modify DefaultT to take into account negated.
type NegateDefaultType<Flag extends string, DefaultT> =
    Flag extends `--no-${string}`
        ? [undefined] extends [DefaultT] ? true : DefaultT
        : [undefined] extends [DefaultT] ? never : DefaultT; // don't add undefined, will make property optional later
    
// Modify ValueT to take into account coerce function.
type CoerceValueType<CoerceT, ValueT> =
    [ValueT] extends [never]
        ? never
        : [CoerceT] extends [undefined]
            ? ValueT
            : CoerceT;
      
// Modify PresetT to take into account coerce function.
type CoercePresetType<CoerceT, PresetT> =
    [PresetT] extends [never]
        ? never
        : [CoerceT] extends [undefined]
            ? PresetT
            : undefined extends PresetT ? undefined : CoerceT;

type BuildOptionProperty<Name extends string, FullValueT, AlwaysDefined extends boolean> =  
  AlwaysDefined extends true
      ? { [K in Name]: FullValueT }
      : { [K in Name]?: FullValueT };

type InferOptionsCombine<Options, Name extends string, FullValueT, AlwaysDefined extends boolean> =
  Resolve<CombineOptions<Options, BuildOptionProperty<Name, FullValueT, AlwaysDefined>>>;

// Combine the possible types
type InferOptionsNegateCombo<Options, Flag extends string, Name extends string, ValueT, PresetT, DefaultT, AlwaysDefined extends boolean> =
  Flag extends `--no-${string}`
    ? Name extends keyof Options
      ? InferOptionsCombine<Options, Name, PresetT, true> // combo does not set default, leave that to positive option
      : InferOptionsCombine<Options, Name, PresetT | DefaultT, true> // lone negated option sets default
    : InferOptionsCombine<Options, Name, ValueT | PresetT | DefaultT, AlwaysDefined>;

// Recalc values taking into account negated option.
// Fill in appropriate PresetT value if undefined.
type InferOptionTypes<Options, Flag extends string, Value extends string, ValueT, PresetT, DefaultT, CoerceT, Mandatory extends boolean, ChoicesT> =
  InferOptionsNegateCombo<Options, Flag, ConvertFlagToName<Flag>,
    CoerceValueType<CoerceT, [ChoicesT] extends [undefined] ? InferVariadic<Value, ValueT> : InferVariadic<Value, ChoicesT>>,
    NegatePresetType<Flag, CoercePresetType<CoerceT, PresetT>>,
    NegateDefaultType<Flag, DefaultT>,
    IsAlwaysDefined<DefaultT, Mandatory>>;

type InferOptionsFlag<Options, Flags extends string, Value extends string, ValueT, PresetT, DefaultT, CoerceT, Mandatory extends boolean, ChoicesT> =
  InferOptionTypes<Options, FlagsToFlag<Trim<Flags>>, Trim<Value>, ValueT, PresetT, DefaultT, CoerceT, Mandatory, ChoicesT>;

// Split up Usage into Flags and Value
type InferOptions<Options, Usage extends string, DefaultT, CoerceT, Mandatory extends boolean, PresetT = undefined, ChoicesT = undefined> =
  Usage extends `${infer Flags} <${infer Value}>`
    ? InferOptionsFlag<Options, Flags, Value, string, never, DefaultT, CoerceT, Mandatory, ChoicesT>
    : Usage extends `${infer Flags} [${infer Value}]`
      ? InferOptionsFlag<Options, Flags, Value, string, PresetT, DefaultT, CoerceT, Mandatory, ChoicesT>
      : InferOptionsFlag<Options, Usage, '', never, PresetT, DefaultT, CoerceT, Mandatory, ChoicesT>;

export type CommandUnknownOpts = Command<unknown[], OptionValues>;

// ----- full copy of normal commander typings from here down, with extra type inference -----

// Using method rather than property for method-signature-style, to document method overloads separately. Allow either.
/* eslint-disable @typescript-eslint/method-signature-style */
/* eslint-disable @typescript-eslint/no-explicit-any */

export class CommanderError extends Error {
    code: string;
    exitCode: number;
    message: string;
    nestedError?: string;
  
    /**
     * Constructs the CommanderError class
     * @param exitCode - suggested exit code which could be used with process.exit
     * @param code - an id string representing the error
     * @param message - human-readable description of the error
     * @constructor
     */
    constructor(exitCode: number, code: string, message: string);
  }
  
  export class InvalidArgumentError extends CommanderError {
    /**
     * Constructs the InvalidArgumentError class
     * @param message - explanation of why argument is invalid
     * @constructor
     */
    constructor(message: string);
  }
  export { InvalidArgumentError as InvalidOptionArgumentError }; // deprecated old name
  
  export interface ErrorOptions { // optional parameter for error()
    /** an id string representing the error */
    code?: string;
    /** suggested exit code which could be used with process.exit */
    exitCode?: number;
  }
  
  export class Argument<Usage extends string = '', DefaultT = undefined, CoerceT = undefined, ArgRequired extends boolean|undefined = undefined, ChoicesT = undefined> {
    description: string;
    required: boolean;
    variadic: boolean;
    defaultValue?: any;
    defaultValueDescription?: string;
    argChoices?: string[];

    /**
     * Initialize a new command argument with the given name and description.
     * The default is that the argument is required, and you can explicitly
     * indicate this with <> around the name. Put [] around the name for an optional argument.
     */
    constructor(arg: Usage, description?: string);
  
    /**
     * Return argument name.
     */
    name(): string;
  
    /**
     * Set the default value, and optionally supply the description to be displayed in the help.
     */
    default<T>(value: T, description?: string): Argument<Usage, T, CoerceT, ArgRequired, ChoicesT>;
  
    /**
     * Set the custom handler for processing CLI command arguments into argument values.
     */
    argParser<T>(fn: (value: string, previous: T) => T): Argument<Usage, DefaultT, T, ArgRequired, undefined>; // setting ChoicesT to undefined because argParser overwrites choices
  
    /**
     * Only allow argument value to be one of choices.
     */
    choices<T extends readonly string[]>(values: T): Argument<Usage, DefaultT, undefined, ArgRequired, T[number]>; // setting CoerceT to undefined because choices overrides argParser
  
    /**
     * Make argument required.
     */
    argRequired(): Argument<Usage, DefaultT, CoerceT, true, ChoicesT>;
  
    /**
     * Make argument optional.
     */
    argOptional(): Argument<Usage, DefaultT, CoerceT, false, ChoicesT>;
  }
  
  export class Option<Usage extends string = '', PresetT = undefined, DefaultT = undefined, CoerceT = undefined, Mandatory extends boolean = false, ChoicesT = undefined> {
    flags: string;
    description: string;
  
    required: boolean; // A value must be supplied when the option is specified.
    optional: boolean; // A value is optional when the option is specified.
    variadic: boolean;
    mandatory: boolean; // The option must have a value after parsing, which usually means it must be specified on command line.
    short?: string;
    long?: string;
    negate: boolean;
    defaultValue?: any;
    defaultValueDescription?: string;
    presetArg?: unknown;
    envVar?: string;
    parseArg?: <T>(value: string, previous: T) => T;
    hidden: boolean;
    argChoices?: string[];
  
    constructor(flags: Usage, description?: string);
  
    /**
     * Set the default value, and optionally supply the description to be displayed in the help.
     */
    default<T>(value: T, description?: string): Option<Usage, PresetT, T, CoerceT, Mandatory, ChoicesT>;
  
    /**
     * Preset to use when option used without option-argument, especially optional but also boolean and negated.
     * The custom processing (parseArg) is called.
     *
     * @example
     * ```ts
     * new Option('--color').default('GREYSCALE').preset('RGB');
     * new Option('--donate [amount]').preset('20').argParser(parseFloat);
     * ```
     */
    preset<T>(arg: T): Option<Usage, T, DefaultT, CoerceT, Mandatory, ChoicesT>;
  
    /**
     * Add option name(s) that conflict with this option.
     * An error will be displayed if conflicting options are found during parsing.
     *
     * @example
     * ```ts
     * new Option('--rgb').conflicts('cmyk');
     * new Option('--js').conflicts(['ts', 'jsx']);
     * ```
     */
    conflicts(names: string | string[]): this;
  
    /**
     * Specify implied option values for when this option is set and the implied options are not.
     *
     * The custom processing (parseArg) is not called on the implied values.
     *
     * @example
     * program
     *   .addOption(new Option('--log', 'write logging information to file'))
     *   .addOption(new Option('--trace', 'log extra details').implies({ log: 'trace.txt' }));
     */
    implies(optionValues: OptionValues): this;
  
    /**
     * Set environment variable to check for option value.
     *
     * An environment variables is only used if when processed the current option value is
     * undefined, or the source of the current value is 'default' or 'config' or 'env'.
     */
    env(name: string): this;
  
    /**
     * Calculate the full description, including defaultValue etc.
     */
    fullDescription(): string;
  
    /**
     * Set the custom handler for processing CLI option arguments into option values.
     */
    argParser<T>(fn: (value: string, previous: T) => T): Option<Usage, PresetT, DefaultT, T, Mandatory, undefined>; // setting ChoicesT to undefined because argParser overrides choices
  
    /**
     * Whether the option is mandatory and must have a value after parsing.
     */
    makeOptionMandatory<M extends boolean = true>(mandatory?: M): Option<Usage, PresetT, DefaultT, CoerceT, M, ChoicesT>;
  
    /**
     * Hide option in help.
     */
    hideHelp(hide?: boolean): this;
  
    /**
     * Only allow option value to be one of choices.
     */
    choices<T extends readonly string[]>(values: T): Option<Usage, PresetT, DefaultT, undefined, Mandatory, T[number]>; // setting CoerceT to undefined becuase choices overrides argParser
  
    /**
     * Return option name.
     */
    name(): string;
  
    /**
     * Return option name, in a camelcase format that can be used
     * as a object attribute key.
     */
    attributeName(): string;
  
    /**
     * Return whether a boolean option.
     *
     * Options are one of boolean, negated, required argument, or optional argument.
     */
    isBoolean(): boolean;
  }
  
  export class Help {
    /** output helpWidth, long lines are wrapped to fit */
    helpWidth?: number;
    sortSubcommands: boolean;
    sortOptions: boolean;
    showGlobalOptions: boolean;

    constructor();
  
    /** Get the command term to show in the list of subcommands. */
    subcommandTerm(cmd: CommandUnknownOpts): string;
    /** Get the command summary to show in the list of subcommands. */
    subcommandDescription(cmd: CommandUnknownOpts): string;
    /** Get the option term to show in the list of options. */
    optionTerm(option: Option): string;
    /** Get the option description to show in the list of options. */
    optionDescription(option: Option): string;
    /** Get the argument term to show in the list of arguments. */
    argumentTerm(argument: Argument): string;
    /** Get the argument description to show in the list of arguments. */
    argumentDescription(argument: Argument): string;
  
    /** Get the command usage to be displayed at the top of the built-in help. */
    commandUsage(cmd: CommandUnknownOpts): string;
    /** Get the description for the command. */
    commandDescription(cmd: CommandUnknownOpts): string;
  
    /** Get an array of the visible subcommands. Includes a placeholder for the implicit help command, if there is one. */
    visibleCommands(cmd: CommandUnknownOpts): CommandUnknownOpts[];
    /** Get an array of the visible options. Includes a placeholder for the implicit help option, if there is one. */
    visibleOptions(cmd: CommandUnknownOpts): Option[];
    /** Get an array of the visible global options. (Not including help.) */
    visibleGlobalOptions(cmd: CommandUnknownOpts): Option[];
    /** Get an array of the arguments which have descriptions. */
    visibleArguments(cmd: CommandUnknownOpts): Argument[];
  
    /** Get the longest command term length. */
    longestSubcommandTermLength(cmd: CommandUnknownOpts, helper: Help): number;
    /** Get the longest option term length. */
    longestOptionTermLength(cmd: CommandUnknownOpts, helper: Help): number;
    /** Get the longest global option term length. */
    longestGlobalOptionTermLength(cmd: CommandUnknownOpts, helper: Help): number;
    /** Get the longest argument term length. */
    longestArgumentTermLength(cmd: CommandUnknownOpts, helper: Help): number;
    /** Calculate the pad width from the maximum term length. */
    padWidth(cmd: CommandUnknownOpts, helper: Help): number;
  
    /**
     * Wrap the given string to width characters per line, with lines after the first indented.
     * Do not wrap if insufficient room for wrapping (minColumnWidth), or string is manually formatted.
     */
    wrap(str: string, width: number, indent: number, minColumnWidth?: number): string;
  
    /** Generate the built-in help text. */
    formatHelp(cmd: CommandUnknownOpts, helper: Help): string;
  }
  export type HelpConfiguration = Partial<Help>;
  
  export interface ParseOptions {
    from: 'node' | 'electron' | 'user';
  }
  export interface HelpContext { // optional parameter for .help() and .outputHelp()
    error: boolean;
  }
  export interface AddHelpTextContext { // passed to text function used with .addHelpText()
    error: boolean;
    command: Command;
  }
  export interface OutputConfiguration {
    writeOut?(str: string): void;
    writeErr?(str: string): void;
    getOutHelpWidth?(): number;
    getErrHelpWidth?(): number;
    outputError?(str: string, write: (str: string) => void): void;
  
  }
  
  export type AddHelpTextPosition = 'beforeAll' | 'before' | 'after' | 'afterAll';
  export type HookEvent = 'preSubcommand' | 'preAction' | 'postAction';
  // The source is a string so author can define their own too.
  export type OptionValueSource = LiteralUnion<'default' | 'config' | 'env' | 'cli' | 'implied', string> | undefined;

  export type OptionValues = Record<string, unknown>;
  
  export class Command<Args extends any[] = [], Opts extends OptionValues = {}> {
    args: string[];
    processedArgs: Args;
    readonly commands: readonly CommandUnknownOpts[];
    readonly options: readonly Option[];
    readonly registeredArguments: readonly Argument[];
    parent: CommandUnknownOpts | null;
  
    constructor(name?: string);
  
    /**
     * Set the program version to `str`.
     *
     * This method auto-registers the "-V, --version" flag
     * which will print the version number when passed.
     *
     * You can optionally supply the  flags and description to override the defaults.
     */
    version(str: string, flags?: string, description?: string): this;
    /**
     * Get the program version.
     */
    version(): string | undefined;
    /**
     * Define a command, implemented using an action handler.
     *
     * @remarks
     * The command description is supplied using `.description`, not as a parameter to `.command`.
     *
     * @example
     * ```ts
     * program
     *   .command('clone <source> [destination]')
     *   .description('clone a repository into a newly created directory')
     *   .action((source, destination) => {
     *     console.log('clone command called');
     *   });
     * ```
     *
     * @param nameAndArgs - command name and arguments, args are  `<required>` or `[optional]` and last may also be `variadic...`
     * @param opts - configuration options
     * @returns new command
     */
    command<Usage extends string>(nameAndArgs: Usage, opts?: CommandOptions): Command<[...InferCommmandArguments<Usage>]>;
    /**
     * Define a command, implemented in a separate executable file.
     *
     * @remarks
     * The command description is supplied as the second parameter to `.command`.
     *
     * @example
     * ```ts
     *  program
     *    .command('start <service>', 'start named service')
     *    .command('stop [service]', 'stop named service, or all if no name supplied');
     * ```
     *
     * @param nameAndArgs - command name and arguments, args are  `<required>` or `[optional]` and last may also be `variadic...`
     * @param description - description of executable command
     * @param opts - configuration options
     * @returns `this` command for chaining
     */
    command(nameAndArgs: string, description: string, opts?: ExecutableCommandOptions): this;
  
    /**
     * Factory routine to create a new unattached command.
     *
     * See .command() for creating an attached subcommand, which uses this routine to
     * create the command. You can override createCommand to customise subcommands.
     */
    createCommand(name?: string): Command;
  
    /**
     * Add a prepared subcommand.
     *
     * See .command() for creating an attached subcommand which inherits settings from its parent.
     *
     * @returns `this` command for chaining
     */
    addCommand(cmd: CommandUnknownOpts, opts?: CommandOptions): this;
  
    /**
     * Factory routine to create a new unattached argument.
     *
     * See .argument() for creating an attached argument, which uses this routine to
     * create the argument. You can override createArgument to return a custom argument.
     */
    createArgument<Usage extends string>(name: Usage, description?: string): Argument<Usage>;
  
    /**
     * Define argument syntax for command.
     *
     * The default is that the argument is required, and you can explicitly
     * indicate this with <> around the name. Put [] around the name for an optional argument.
     *
     * @example
     * ```
     * program.argument('<input-file>');
     * program.argument('[output-file]');
     * ```
     *
     * @returns `this` command for chaining
     */
    argument<S extends string, T>(
        flags: S, description: string, fn: (value: string, previous: T) => T): Command<[...Args, InferArgument<S, undefined, T>], Opts>;
    argument<S extends string, T>(
        flags: S, description: string, fn: (value: string, previous: T) => T, defaultValue: T): Command<[...Args, InferArgument<S, T, T>], Opts>;
    argument<S extends string>(
        usage: S, description?: string): Command<[...Args, InferArgument<S, undefined>], Opts>;
    argument<S extends string, DefaultT>(
        usage: S, description: string, defaultValue: DefaultT): Command<[...Args, InferArgument<S, DefaultT>], Opts>;
    
    /**
     * Define argument syntax for command, adding a prepared argument.
     *
     * @returns `this` command for chaining
     */
    addArgument<Usage extends string, DefaultT, CoerceT, ArgRequired extends boolean|undefined, ChoicesT>(
      arg: Argument<Usage, DefaultT, CoerceT, ArgRequired, ChoicesT>): Command<[...Args, InferArgument<Usage, DefaultT, CoerceT, ArgRequired, ChoicesT>], Opts>;

  
    /**
     * Define argument syntax for command, adding multiple at once (without descriptions).
     *
     * See also .argument().
     *
     * @example
     * ```
     * program.arguments('<cmd> [env]');
     * ```
     *
     * @returns `this` command for chaining
     */
    arguments<Names extends string>(args: Names): Command<[...Args, ...InferArguments<Names>], Opts>;

  
    /**
     * Override default decision whether to add implicit help command.
     *
     * @example
     * ```
     * addHelpCommand() // force on
     * addHelpCommand(false); // force off
     * addHelpCommand('help [cmd]', 'display help for [cmd]'); // force on with custom details
     * ```
     *
     * @returns `this` command for chaining
     */
    addHelpCommand(enableOrNameAndArgs?: string | boolean, description?: string): this;
  
    /**
     * Add hook for life cycle event.
     */
    hook(event: HookEvent, listener: (thisCommand: this, actionCommand: CommandUnknownOpts) => void | Promise<void>): this;
  
    /**
     * Register callback to use as replacement for calling process.exit.
     */
    exitOverride(callback?: (err: CommanderError) => never | void): this;
  
    /**
     * Display error message and exit (or call exitOverride).
     */
    error(message: string, errorOptions?: ErrorOptions): never;
  
    /**
     * You can customise the help with a subclass of Help by overriding createHelp,
     * or by overriding Help properties using configureHelp().
     */
    createHelp(): Help;
  
    /**
     * You can customise the help by overriding Help properties using configureHelp(),
     * or with a subclass of Help by overriding createHelp().
     */
    configureHelp(configuration: HelpConfiguration): this;
    /** Get configuration */
    configureHelp(): HelpConfiguration;
  
    /**
     * The default output goes to stdout and stderr. You can customise this for special
     * applications. You can also customise the display of errors by overriding outputError.
     *
     * The configuration properties are all functions:
     * ```
     * // functions to change where being written, stdout and stderr
     * writeOut(str)
     * writeErr(str)
     * // matching functions to specify width for wrapping help
     * getOutHelpWidth()
     * getErrHelpWidth()
     * // functions based on what is being written out
     * outputError(str, write) // used for displaying errors, and not used for displaying help
     * ```
     */
    configureOutput(configuration: OutputConfiguration): this;
    /** Get configuration */
    configureOutput(): OutputConfiguration;
  
    /**
     * Copy settings that are useful to have in common across root command and subcommands.
     *
     * (Used internally when adding a command using `.command()` so subcommands inherit parent settings.)
     */
    copyInheritedSettings(sourceCommand: CommandUnknownOpts): this;
  
    /**
     * Display the help or a custom message after an error occurs.
     */
    showHelpAfterError(displayHelp?: boolean | string): this;
  
    /**
     * Display suggestion of similar commands for unknown commands, or options for unknown options.
     */
    showSuggestionAfterError(displaySuggestion?: boolean): this;
  
    /**
     * Register callback `fn` for the command.
     *
     * @example
     * ```
     * program
     *   .command('serve')
     *   .description('start service')
     *   .action(function() {
     *     // do work here
     *   });
     * ```
     *
     * @returns `this` command for chaining
     */
    action(fn: (...args: [...Args, Opts, this]) => void | Promise<void>): this;

    /**
     * Define option with `flags`, `description`, and optional argument parsing function or `defaultValue` or both.
     *
     * The `flags` string contains the short and/or long flags, separated by comma, a pipe or space. A required
     * option-argument is indicated by `<>` and an optional option-argument by `[]`.
     *
     * See the README for more details, and see also addOption() and requiredOption().
     *
     * @example
     *
     * ```js
     * program
     *     .option('-p, --pepper', 'add pepper')
     *     .option('-p, --pizza-type <TYPE>', 'type of pizza') // required option-argument
     *     .option('-c, --cheese [CHEESE]', 'add extra cheese', 'mozzarella') // optional option-argument with default
     *     .option('-t, --tip <VALUE>', 'add tip to purchase cost', parseFloat) // custom parse function
     * ```
     *
     * @returns `this` command for chaining
     */
    option<S extends string>(
        usage: S, description?: string): Command<Args, InferOptions<Opts, S, undefined, undefined, false>>;
    option<S extends string, DefaultT extends string | boolean | string[] | []>(
        usage: S, description?: string, defaultValue?: DefaultT): Command<Args, InferOptions<Opts, S, DefaultT, undefined, false>>;
    option<S extends string, T>(
        usage: S, description: string, parseArg: (value: string, previous: T) => T): Command<Args, InferOptions<Opts, S, undefined, T, false>>;
    option<S extends string, T>(
        usage: S, description: string, parseArg: (value: string, previous: T) => T, defaultValue?: T): Command<Args, InferOptions<Opts, S, T, T, false>>;
      
    /**
     * Define a required option, which must have a value after parsing. This usually means
     * the option must be specified on the command line. (Otherwise the same as .option().)
     *
     * The `flags` string contains the short and/or long flags, separated by comma, a pipe or space.
     */
    requiredOption<S extends string>(
        usage: S, description?: string): Command<Args, InferOptions<Opts, S, undefined, undefined, true>>;
    requiredOption<S extends string, DefaultT extends string | boolean | string[]>(
        usage: S, description?: string, defaultValue?: DefaultT): Command<Args, InferOptions<Opts, S, DefaultT, undefined, true>>;
    requiredOption<S extends string, T>(
        usage: S, description: string, parseArg: (value: string, previous: T) => T): Command<Args, InferOptions<Opts, S, undefined, T, true>>;
    requiredOption<S extends string, T, D extends T>(
        usage: S, description: string, parseArg: (value: string, previous: T) => T, defaultValue?: D): Command<Args, InferOptions<Opts, S, D, T, true>>;
      
    /**
     * Factory routine to create a new unattached option.
     *
     * See .option() for creating an attached option, which uses this routine to
     * create the option. You can override createOption to return a custom option.
     */
  
    createOption<Usage extends string>(flags: Usage, description?: string): Option<Usage>;
  
    /**
     * Add a prepared Option.
     *
     * See .option() and .requiredOption() for creating and attaching an option in a single call.
     */
    addOption<Usage extends string, PresetT, DefaultT, CoerceT, Mandatory extends boolean, ChoicesT>(
        option: Option<Usage, PresetT, DefaultT, CoerceT, Mandatory, ChoicesT>): Command<Args, InferOptions<Opts, Usage, DefaultT, CoerceT, Mandatory, PresetT, ChoicesT>>;
     
    /**
     * Whether to store option values as properties on command object,
     * or store separately (specify false). In both cases the option values can be accessed using .opts().
     *
     * @returns `this` command for chaining
     */
    storeOptionsAsProperties<T extends OptionValues>(): this & T;
    storeOptionsAsProperties<T extends OptionValues>(storeAsProperties: true): this & T;
    storeOptionsAsProperties(storeAsProperties?: boolean): this;
  
    /**
     * Retrieve option value.
     */
    getOptionValue<K extends keyof Opts>(key: K): Opts[K];
    getOptionValue(key: string): unknown;
  
    /**
     * Store option value.
     */
     setOptionValue<K extends keyof Opts>(key: K, value: unknown): this;
     setOptionValue(key: string, value: unknown): this;
  
    /**
     * Store option value and where the value came from.
     */
     setOptionValueWithSource<K extends keyof Opts>(key: K, value: unknown, source: OptionValueSource): this;
     setOptionValueWithSource(key: string, value: unknown, source: OptionValueSource): this;
  
    /**
     * Get source of option value.
     */
     getOptionValueSource<K extends keyof Opts>(key: K): OptionValueSource | undefined;
     getOptionValueSource(key: string): OptionValueSource | undefined;
  
    /**
     * Get source of option value. See also .optsWithGlobals().
     */
    getOptionValueSourceWithGlobals<K extends keyof Opts>(key: K): OptionValueSource | undefined;
    getOptionValueSourceWithGlobals(key: string): OptionValueSource | undefined;

    /**
     * Alter parsing of short flags with optional values.
     *
     * @example
     * ```
     * // for `.option('-f,--flag [value]'):
     * .combineFlagAndOptionalValue(true)  // `-f80` is treated like `--flag=80`, this is the default behaviour
     * .combineFlagAndOptionalValue(false) // `-fb` is treated like `-f -b`
     * ```
     *
     * @returns `this` command for chaining
     */
    combineFlagAndOptionalValue(combine?: boolean): this;
  
    /**
     * Allow unknown options on the command line.
     *
     * @returns `this` command for chaining
     */
    allowUnknownOption(allowUnknown?: boolean): this;
  
    /**
     * Allow excess command-arguments on the command line. Pass false to make excess arguments an error.
     *
     * @returns `this` command for chaining
     */
    allowExcessArguments(allowExcess?: boolean): this;
  
    /**
     * Enable positional options. Positional means global options are specified before subcommands which lets
     * subcommands reuse the same option names, and also enables subcommands to turn on passThroughOptions.
     *
     * The default behaviour is non-positional and global options may appear anywhere on the command line.
     *
     * @returns `this` command for chaining
     */
    enablePositionalOptions(positional?: boolean): this;
  
    /**
     * Pass through options that come after command-arguments rather than treat them as command-options,
     * so actual command-options come before command-arguments. Turning this on for a subcommand requires
     * positional options to have been enabled on the program (parent commands).
     *
     * The default behaviour is non-positional and options may appear before or after command-arguments.
     *
     * @returns `this` command for chaining
     */
    passThroughOptions(passThrough?: boolean): this;
  
    /**
     * Parse `argv`, setting options and invoking commands when defined.
     *
     * The default expectation is that the arguments are from node and have the application as argv[0]
     * and the script being run in argv[1], with user parameters after that.
     *
     * @example
     * ```
     * program.parse(process.argv);
     * program.parse(); // implicitly use process.argv and auto-detect node vs electron conventions
     * program.parse(my-args, { from: 'user' }); // just user supplied arguments, nothing special about argv[0]
     * ```
     *
     * @returns `this` command for chaining
     */
    parse(argv?: readonly string[], options?: ParseOptions): this;
  
    /**
     * Parse `argv`, setting options and invoking commands when defined.
     *
     * Use parseAsync instead of parse if any of your action handlers are async. Returns a Promise.
     *
     * The default expectation is that the arguments are from node and have the application as argv[0]
     * and the script being run in argv[1], with user parameters after that.
     *
     * @example
     * ```
     * program.parseAsync(process.argv);
     * program.parseAsync(); // implicitly use process.argv and auto-detect node vs electron conventions
     * program.parseAsync(my-args, { from: 'user' }); // just user supplied arguments, nothing special about argv[0]
     * ```
     *
     * @returns Promise
     */
    parseAsync(argv?: readonly string[], options?: ParseOptions): Promise<this>;
  
    /**
     * Parse options from `argv` removing known options,
     * and return argv split into operands and unknown arguments.
     *
     *     argv => operands, unknown
     *     --known kkk op => [op], []
     *     op --known kkk => [op], []
     *     sub --unknown uuu op => [sub], [--unknown uuu op]
     *     sub -- --unknown uuu op => [sub --unknown uuu op], []
     */
    parseOptions(argv: string[]): ParseOptionsResult;
  
    /**
     * Return an object containing local option values as key-value pairs
     */
    opts(): Opts;
  
    /**
     * Return an object containing merged local and global option values as key-value pairs.
     */
    optsWithGlobals<T extends OptionValues>(): T;
  
    /**
     * Set the description.
     *
     * @returns `this` command for chaining
     */
  
    description(str: string): this;
    /** @deprecated since v8, instead use .argument to add command argument with description */
    description(str: string, argsDescription: Record<string, string>): this;
    /**
     * Get the description.
     */
    description(): string;
  
    /**
     * Set the summary. Used when listed as subcommand of parent.
     *
     * @returns `this` command for chaining
     */
  
    summary(str: string): this;
    /**
     * Get the summary.
     */
    summary(): string;
  
    /**
     * Set an alias for the command.
     *
     * You may call more than once to add multiple aliases. Only the first alias is shown in the auto-generated help.
     *
     * @returns `this` command for chaining
     */
    alias(alias: string): this;
    /**
     * Get alias for the command.
     */
    alias(): string;
  
    /**
     * Set aliases for the command.
     *
     * Only the first alias is shown in the auto-generated help.
     *
     * @returns `this` command for chaining
     */
    aliases(aliases: readonly string[]): this;
    /**
     * Get aliases for the command.
     */
    aliases(): string[];
  
    /**
     * Set the command usage.
     *
     * @returns `this` command for chaining
     */
    usage(str: string): this;
    /**
     * Get the command usage.
     */
    usage(): string;
  
    /**
     * Set the name of the command.
     *
     * @returns `this` command for chaining
     */
    name(str: string): this;
    /**
     * Get the name of the command.
     */
    name(): string;
  
    /**
     * Set the name of the command from script filename, such as process.argv[1],
     * or require.main.filename, or __filename.
     *
     * (Used internally and public although not documented in README.)
     *
     * @example
     * ```ts
     * program.nameFromFilename(require.main.filename);
     * ```
     *
     * @returns `this` command for chaining
     */
    nameFromFilename(filename: string): this;
  
    /**
     * Set the directory for searching for executable subcommands of this command.
     *
     * @example
     * ```ts
     * program.executableDir(__dirname);
     * // or
     * program.executableDir('subcommands');
     * ```
     *
     * @returns `this` command for chaining
     */
    executableDir(path: string): this;
    /**
     * Get the executable search directory.
     */
    executableDir(): string | null;
  
    /**
     * Output help information for this command.
     *
     * Outputs built-in help, and custom text added using `.addHelpText()`.
     *
     */
    outputHelp(context?: HelpContext): void;
    /** @deprecated since v7 */
    outputHelp(cb?: (str: string) => string): void;
  
    /**
     * Return command help documentation.
     */
    helpInformation(context?: HelpContext): string;
  
    /**
     * You can pass in flags and a description to override the help
     * flags and help description for your command. Pass in false
     * to disable the built-in help option.
     */
    helpOption(flags?: string | boolean, description?: string): this;
  
    /**
     * Output help information and exit.
     *
     * Outputs built-in help, and custom text added using `.addHelpText()`.
     */
    help(context?: HelpContext): never;
    /** @deprecated since v7 */
    help(cb?: (str: string) => string): never;
  
    /**
     * Add additional text to be displayed with the built-in help.
     *
     * Position is 'before' or 'after' to affect just this command,
     * and 'beforeAll' or 'afterAll' to affect this command and all its subcommands.
     */
    addHelpText(position: AddHelpTextPosition, text: string): this;
    addHelpText(position: AddHelpTextPosition, text: (context: AddHelpTextContext) => string): this;
  
    /**
     * Add a listener (callback) for when events occur. (Implemented using EventEmitter.)
     */
    on(event: string | symbol, listener: (...args: any[]) => void): this;
  }
  
  export interface CommandOptions {
    hidden?: boolean;
    isDefault?: boolean;
    /** @deprecated since v7, replaced by hidden */
    noHelp?: boolean;
  }
  export interface ExecutableCommandOptions extends CommandOptions {
    executableFile?: string;
  }
  
  export interface ParseOptionsResult {
    operands: string[];
    unknown: string[];
  }
  
  export function createCommand(name?: string): Command;
  export function createOption<Usage extends string>(flags: Usage, description?: string): Option<Usage>;
  export function createArgument<Usage extends string>(name: Usage, description?: string): Argument<Usage>;
  
  export const program: Command;