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(The MIT License)
Copyright (c) 2011 TJ Holowaychuk <tj@vision-media.ca>
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
'Software'), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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import commander from './index.js';
// wrapper to provide named exports for ESM.
export const {
program,
createCommand,
createArgument,
createOption,
CommanderError,
InvalidArgumentError,
InvalidOptionArgumentError, // deprecated old name
Command,
Argument,
Option,
Help,
} = commander;

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const { Argument } = require('./lib/argument.js');
const { Command } = require('./lib/command.js');
const { CommanderError, InvalidArgumentError } = require('./lib/error.js');
const { Help } = require('./lib/help.js');
const { Option } = require('./lib/option.js');
exports.program = new Command();
exports.createCommand = (name) => new Command(name);
exports.createOption = (flags, description) => new Option(flags, description);
exports.createArgument = (name, description) => new Argument(name, description);
/**
* Expose classes
*/
exports.Command = Command;
exports.Option = Option;
exports.Argument = Argument;
exports.Help = Help;
exports.CommanderError = CommanderError;
exports.InvalidArgumentError = InvalidArgumentError;
exports.InvalidOptionArgumentError = InvalidArgumentError; // Deprecated

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const { InvalidArgumentError } = require('./error.js');
class Argument {
/**
* 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.
*
* @param {string} name
* @param {string} [description]
*/
constructor(name, description) {
this.description = description || '';
this.variadic = false;
this.parseArg = undefined;
this.defaultValue = undefined;
this.defaultValueDescription = undefined;
this.argChoices = undefined;
switch (name[0]) {
case '<': // e.g. <required>
this.required = true;
this._name = name.slice(1, -1);
break;
case '[': // e.g. [optional]
this.required = false;
this._name = name.slice(1, -1);
break;
default:
this.required = true;
this._name = name;
break;
}
if (this._name.length > 3 && this._name.slice(-3) === '...') {
this.variadic = true;
this._name = this._name.slice(0, -3);
}
}
/**
* Return argument name.
*
* @return {string}
*/
name() {
return this._name;
}
/**
* @package
*/
_concatValue(value, previous) {
if (previous === this.defaultValue || !Array.isArray(previous)) {
return [value];
}
return previous.concat(value);
}
/**
* Set the default value, and optionally supply the description to be displayed in the help.
*
* @param {*} value
* @param {string} [description]
* @return {Argument}
*/
default(value, description) {
this.defaultValue = value;
this.defaultValueDescription = description;
return this;
}
/**
* Set the custom handler for processing CLI command arguments into argument values.
*
* @param {Function} [fn]
* @return {Argument}
*/
argParser(fn) {
this.parseArg = fn;
return this;
}
/**
* Only allow argument value to be one of choices.
*
* @param {string[]} values
* @return {Argument}
*/
choices(values) {
this.argChoices = values.slice();
this.parseArg = (arg, previous) => {
if (!this.argChoices.includes(arg)) {
throw new InvalidArgumentError(
`Allowed choices are ${this.argChoices.join(', ')}.`,
);
}
if (this.variadic) {
return this._concatValue(arg, previous);
}
return arg;
};
return this;
}
/**
* Make argument required.
*
* @returns {Argument}
*/
argRequired() {
this.required = true;
return this;
}
/**
* Make argument optional.
*
* @returns {Argument}
*/
argOptional() {
this.required = false;
return this;
}
}
/**
* Takes an argument and returns its human readable equivalent for help usage.
*
* @param {Argument} arg
* @return {string}
* @private
*/
function humanReadableArgName(arg) {
const nameOutput = arg.name() + (arg.variadic === true ? '...' : '');
return arg.required ? '<' + nameOutput + '>' : '[' + nameOutput + ']';
}
exports.Argument = Argument;
exports.humanReadableArgName = humanReadableArgName;

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/**
* CommanderError class
*/
class CommanderError extends Error {
/**
* Constructs the CommanderError class
* @param {number} exitCode suggested exit code which could be used with process.exit
* @param {string} code an id string representing the error
* @param {string} message human-readable description of the error
*/
constructor(exitCode, code, message) {
super(message);
// properly capture stack trace in Node.js
Error.captureStackTrace(this, this.constructor);
this.name = this.constructor.name;
this.code = code;
this.exitCode = exitCode;
this.nestedError = undefined;
}
}
/**
* InvalidArgumentError class
*/
class InvalidArgumentError extends CommanderError {
/**
* Constructs the InvalidArgumentError class
* @param {string} [message] explanation of why argument is invalid
*/
constructor(message) {
super(1, 'commander.invalidArgument', message);
// properly capture stack trace in Node.js
Error.captureStackTrace(this, this.constructor);
this.name = this.constructor.name;
}
}
exports.CommanderError = CommanderError;
exports.InvalidArgumentError = InvalidArgumentError;

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const { humanReadableArgName } = require('./argument.js');
/**
* TypeScript import types for JSDoc, used by Visual Studio Code IntelliSense and `npm run typescript-checkJS`
* https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html#import-types
* @typedef { import("./argument.js").Argument } Argument
* @typedef { import("./command.js").Command } Command
* @typedef { import("./option.js").Option } Option
*/
// Although this is a class, methods are static in style to allow override using subclass or just functions.
class Help {
constructor() {
this.helpWidth = undefined;
this.minWidthToWrap = 40;
this.sortSubcommands = false;
this.sortOptions = false;
this.showGlobalOptions = false;
}
/**
* prepareContext is called by Commander after applying overrides from `Command.configureHelp()`
* and just before calling `formatHelp()`.
*
* Commander just uses the helpWidth and the rest is provided for optional use by more complex subclasses.
*
* @param {{ error?: boolean, helpWidth?: number, outputHasColors?: boolean }} contextOptions
*/
prepareContext(contextOptions) {
this.helpWidth = this.helpWidth ?? contextOptions.helpWidth ?? 80;
}
/**
* Get an array of the visible subcommands. Includes a placeholder for the implicit help command, if there is one.
*
* @param {Command} cmd
* @returns {Command[]}
*/
visibleCommands(cmd) {
const visibleCommands = cmd.commands.filter((cmd) => !cmd._hidden);
const helpCommand = cmd._getHelpCommand();
if (helpCommand && !helpCommand._hidden) {
visibleCommands.push(helpCommand);
}
if (this.sortSubcommands) {
visibleCommands.sort((a, b) => {
// @ts-ignore: because overloaded return type
return a.name().localeCompare(b.name());
});
}
return visibleCommands;
}
/**
* Compare options for sort.
*
* @param {Option} a
* @param {Option} b
* @returns {number}
*/
compareOptions(a, b) {
const getSortKey = (option) => {
// WYSIWYG for order displayed in help. Short used for comparison if present. No special handling for negated.
return option.short
? option.short.replace(/^-/, '')
: option.long.replace(/^--/, '');
};
return getSortKey(a).localeCompare(getSortKey(b));
}
/**
* Get an array of the visible options. Includes a placeholder for the implicit help option, if there is one.
*
* @param {Command} cmd
* @returns {Option[]}
*/
visibleOptions(cmd) {
const visibleOptions = cmd.options.filter((option) => !option.hidden);
// Built-in help option.
const helpOption = cmd._getHelpOption();
if (helpOption && !helpOption.hidden) {
// Automatically hide conflicting flags. Bit dubious but a historical behaviour that is convenient for single-command programs.
const removeShort = helpOption.short && cmd._findOption(helpOption.short);
const removeLong = helpOption.long && cmd._findOption(helpOption.long);
if (!removeShort && !removeLong) {
visibleOptions.push(helpOption); // no changes needed
} else if (helpOption.long && !removeLong) {
visibleOptions.push(
cmd.createOption(helpOption.long, helpOption.description),
);
} else if (helpOption.short && !removeShort) {
visibleOptions.push(
cmd.createOption(helpOption.short, helpOption.description),
);
}
}
if (this.sortOptions) {
visibleOptions.sort(this.compareOptions);
}
return visibleOptions;
}
/**
* Get an array of the visible global options. (Not including help.)
*
* @param {Command} cmd
* @returns {Option[]}
*/
visibleGlobalOptions(cmd) {
if (!this.showGlobalOptions) return [];
const globalOptions = [];
for (
let ancestorCmd = cmd.parent;
ancestorCmd;
ancestorCmd = ancestorCmd.parent
) {
const visibleOptions = ancestorCmd.options.filter(
(option) => !option.hidden,
);
globalOptions.push(...visibleOptions);
}
if (this.sortOptions) {
globalOptions.sort(this.compareOptions);
}
return globalOptions;
}
/**
* Get an array of the arguments if any have a description.
*
* @param {Command} cmd
* @returns {Argument[]}
*/
visibleArguments(cmd) {
// Side effect! Apply the legacy descriptions before the arguments are displayed.
if (cmd._argsDescription) {
cmd.registeredArguments.forEach((argument) => {
argument.description =
argument.description || cmd._argsDescription[argument.name()] || '';
});
}
// If there are any arguments with a description then return all the arguments.
if (cmd.registeredArguments.find((argument) => argument.description)) {
return cmd.registeredArguments;
}
return [];
}
/**
* Get the command term to show in the list of subcommands.
*
* @param {Command} cmd
* @returns {string}
*/
subcommandTerm(cmd) {
// Legacy. Ignores custom usage string, and nested commands.
const args = cmd.registeredArguments
.map((arg) => humanReadableArgName(arg))
.join(' ');
return (
cmd._name +
(cmd._aliases[0] ? '|' + cmd._aliases[0] : '') +
(cmd.options.length ? ' [options]' : '') + // simplistic check for non-help option
(args ? ' ' + args : '')
);
}
/**
* Get the option term to show in the list of options.
*
* @param {Option} option
* @returns {string}
*/
optionTerm(option) {
return option.flags;
}
/**
* Get the argument term to show in the list of arguments.
*
* @param {Argument} argument
* @returns {string}
*/
argumentTerm(argument) {
return argument.name();
}
/**
* Get the longest command term length.
*
* @param {Command} cmd
* @param {Help} helper
* @returns {number}
*/
longestSubcommandTermLength(cmd, helper) {
return helper.visibleCommands(cmd).reduce((max, command) => {
return Math.max(
max,
this.displayWidth(
helper.styleSubcommandTerm(helper.subcommandTerm(command)),
),
);
}, 0);
}
/**
* Get the longest option term length.
*
* @param {Command} cmd
* @param {Help} helper
* @returns {number}
*/
longestOptionTermLength(cmd, helper) {
return helper.visibleOptions(cmd).reduce((max, option) => {
return Math.max(
max,
this.displayWidth(helper.styleOptionTerm(helper.optionTerm(option))),
);
}, 0);
}
/**
* Get the longest global option term length.
*
* @param {Command} cmd
* @param {Help} helper
* @returns {number}
*/
longestGlobalOptionTermLength(cmd, helper) {
return helper.visibleGlobalOptions(cmd).reduce((max, option) => {
return Math.max(
max,
this.displayWidth(helper.styleOptionTerm(helper.optionTerm(option))),
);
}, 0);
}
/**
* Get the longest argument term length.
*
* @param {Command} cmd
* @param {Help} helper
* @returns {number}
*/
longestArgumentTermLength(cmd, helper) {
return helper.visibleArguments(cmd).reduce((max, argument) => {
return Math.max(
max,
this.displayWidth(
helper.styleArgumentTerm(helper.argumentTerm(argument)),
),
);
}, 0);
}
/**
* Get the command usage to be displayed at the top of the built-in help.
*
* @param {Command} cmd
* @returns {string}
*/
commandUsage(cmd) {
// Usage
let cmdName = cmd._name;
if (cmd._aliases[0]) {
cmdName = cmdName + '|' + cmd._aliases[0];
}
let ancestorCmdNames = '';
for (
let ancestorCmd = cmd.parent;
ancestorCmd;
ancestorCmd = ancestorCmd.parent
) {
ancestorCmdNames = ancestorCmd.name() + ' ' + ancestorCmdNames;
}
return ancestorCmdNames + cmdName + ' ' + cmd.usage();
}
/**
* Get the description for the command.
*
* @param {Command} cmd
* @returns {string}
*/
commandDescription(cmd) {
// @ts-ignore: because overloaded return type
return cmd.description();
}
/**
* Get the subcommand summary to show in the list of subcommands.
* (Fallback to description for backwards compatibility.)
*
* @param {Command} cmd
* @returns {string}
*/
subcommandDescription(cmd) {
// @ts-ignore: because overloaded return type
return cmd.summary() || cmd.description();
}
/**
* Get the option description to show in the list of options.
*
* @param {Option} option
* @return {string}
*/
optionDescription(option) {
const extraInfo = [];
if (option.argChoices) {
extraInfo.push(
// use stringify to match the display of the default value
`choices: ${option.argChoices.map((choice) => JSON.stringify(choice)).join(', ')}`,
);
}
if (option.defaultValue !== undefined) {
// default for boolean and negated more for programmer than end user,
// but show true/false for boolean option as may be for hand-rolled env or config processing.
const showDefault =
option.required ||
option.optional ||
(option.isBoolean() && typeof option.defaultValue === 'boolean');
if (showDefault) {
extraInfo.push(
`default: ${option.defaultValueDescription || JSON.stringify(option.defaultValue)}`,
);
}
}
// preset for boolean and negated are more for programmer than end user
if (option.presetArg !== undefined && option.optional) {
extraInfo.push(`preset: ${JSON.stringify(option.presetArg)}`);
}
if (option.envVar !== undefined) {
extraInfo.push(`env: ${option.envVar}`);
}
if (extraInfo.length > 0) {
return `${option.description} (${extraInfo.join(', ')})`;
}
return option.description;
}
/**
* Get the argument description to show in the list of arguments.
*
* @param {Argument} argument
* @return {string}
*/
argumentDescription(argument) {
const extraInfo = [];
if (argument.argChoices) {
extraInfo.push(
// use stringify to match the display of the default value
`choices: ${argument.argChoices.map((choice) => JSON.stringify(choice)).join(', ')}`,
);
}
if (argument.defaultValue !== undefined) {
extraInfo.push(
`default: ${argument.defaultValueDescription || JSON.stringify(argument.defaultValue)}`,
);
}
if (extraInfo.length > 0) {
const extraDescription = `(${extraInfo.join(', ')})`;
if (argument.description) {
return `${argument.description} ${extraDescription}`;
}
return extraDescription;
}
return argument.description;
}
/**
* Generate the built-in help text.
*
* @param {Command} cmd
* @param {Help} helper
* @returns {string}
*/
formatHelp(cmd, helper) {
const termWidth = helper.padWidth(cmd, helper);
const helpWidth = helper.helpWidth ?? 80; // in case prepareContext() was not called
function callFormatItem(term, description) {
return helper.formatItem(term, termWidth, description, helper);
}
// Usage
let output = [
`${helper.styleTitle('Usage:')} ${helper.styleUsage(helper.commandUsage(cmd))}`,
'',
];
// Description
const commandDescription = helper.commandDescription(cmd);
if (commandDescription.length > 0) {
output = output.concat([
helper.boxWrap(
helper.styleCommandDescription(commandDescription),
helpWidth,
),
'',
]);
}
// Arguments
const argumentList = helper.visibleArguments(cmd).map((argument) => {
return callFormatItem(
helper.styleArgumentTerm(helper.argumentTerm(argument)),
helper.styleArgumentDescription(helper.argumentDescription(argument)),
);
});
if (argumentList.length > 0) {
output = output.concat([
helper.styleTitle('Arguments:'),
...argumentList,
'',
]);
}
// Options
const optionList = helper.visibleOptions(cmd).map((option) => {
return callFormatItem(
helper.styleOptionTerm(helper.optionTerm(option)),
helper.styleOptionDescription(helper.optionDescription(option)),
);
});
if (optionList.length > 0) {
output = output.concat([
helper.styleTitle('Options:'),
...optionList,
'',
]);
}
if (helper.showGlobalOptions) {
const globalOptionList = helper
.visibleGlobalOptions(cmd)
.map((option) => {
return callFormatItem(
helper.styleOptionTerm(helper.optionTerm(option)),
helper.styleOptionDescription(helper.optionDescription(option)),
);
});
if (globalOptionList.length > 0) {
output = output.concat([
helper.styleTitle('Global Options:'),
...globalOptionList,
'',
]);
}
}
// Commands
const commandList = helper.visibleCommands(cmd).map((cmd) => {
return callFormatItem(
helper.styleSubcommandTerm(helper.subcommandTerm(cmd)),
helper.styleSubcommandDescription(helper.subcommandDescription(cmd)),
);
});
if (commandList.length > 0) {
output = output.concat([
helper.styleTitle('Commands:'),
...commandList,
'',
]);
}
return output.join('\n');
}
/**
* Return display width of string, ignoring ANSI escape sequences. Used in padding and wrapping calculations.
*
* @param {string} str
* @returns {number}
*/
displayWidth(str) {
return stripColor(str).length;
}
/**
* Style the title for displaying in the help. Called with 'Usage:', 'Options:', etc.
*
* @param {string} str
* @returns {string}
*/
styleTitle(str) {
return str;
}
styleUsage(str) {
// Usage has lots of parts the user might like to color separately! Assume default usage string which is formed like:
// command subcommand [options] [command] <foo> [bar]
return str
.split(' ')
.map((word) => {
if (word === '[options]') return this.styleOptionText(word);
if (word === '[command]') return this.styleSubcommandText(word);
if (word[0] === '[' || word[0] === '<')
return this.styleArgumentText(word);
return this.styleCommandText(word); // Restrict to initial words?
})
.join(' ');
}
styleCommandDescription(str) {
return this.styleDescriptionText(str);
}
styleOptionDescription(str) {
return this.styleDescriptionText(str);
}
styleSubcommandDescription(str) {
return this.styleDescriptionText(str);
}
styleArgumentDescription(str) {
return this.styleDescriptionText(str);
}
styleDescriptionText(str) {
return str;
}
styleOptionTerm(str) {
return this.styleOptionText(str);
}
styleSubcommandTerm(str) {
// This is very like usage with lots of parts! Assume default string which is formed like:
// subcommand [options] <foo> [bar]
return str
.split(' ')
.map((word) => {
if (word === '[options]') return this.styleOptionText(word);
if (word[0] === '[' || word[0] === '<')
return this.styleArgumentText(word);
return this.styleSubcommandText(word); // Restrict to initial words?
})
.join(' ');
}
styleArgumentTerm(str) {
return this.styleArgumentText(str);
}
styleOptionText(str) {
return str;
}
styleArgumentText(str) {
return str;
}
styleSubcommandText(str) {
return str;
}
styleCommandText(str) {
return str;
}
/**
* Calculate the pad width from the maximum term length.
*
* @param {Command} cmd
* @param {Help} helper
* @returns {number}
*/
padWidth(cmd, helper) {
return Math.max(
helper.longestOptionTermLength(cmd, helper),
helper.longestGlobalOptionTermLength(cmd, helper),
helper.longestSubcommandTermLength(cmd, helper),
helper.longestArgumentTermLength(cmd, helper),
);
}
/**
* Detect manually wrapped and indented strings by checking for line break followed by whitespace.
*
* @param {string} str
* @returns {boolean}
*/
preformatted(str) {
return /\n[^\S\r\n]/.test(str);
}
/**
* Format the "item", which consists of a term and description. Pad the term and wrap the description, indenting the following lines.
*
* So "TTT", 5, "DDD DDDD DD DDD" might be formatted for this.helpWidth=17 like so:
* TTT DDD DDDD
* DD DDD
*
* @param {string} term
* @param {number} termWidth
* @param {string} description
* @param {Help} helper
* @returns {string}
*/
formatItem(term, termWidth, description, helper) {
const itemIndent = 2;
const itemIndentStr = ' '.repeat(itemIndent);
if (!description) return itemIndentStr + term;
// Pad the term out to a consistent width, so descriptions are aligned.
const paddedTerm = term.padEnd(
termWidth + term.length - helper.displayWidth(term),
);
// Format the description.
const spacerWidth = 2; // between term and description
const helpWidth = this.helpWidth ?? 80; // in case prepareContext() was not called
const remainingWidth = helpWidth - termWidth - spacerWidth - itemIndent;
let formattedDescription;
if (
remainingWidth < this.minWidthToWrap ||
helper.preformatted(description)
) {
formattedDescription = description;
} else {
const wrappedDescription = helper.boxWrap(description, remainingWidth);
formattedDescription = wrappedDescription.replace(
/\n/g,
'\n' + ' '.repeat(termWidth + spacerWidth),
);
}
// Construct and overall indent.
return (
itemIndentStr +
paddedTerm +
' '.repeat(spacerWidth) +
formattedDescription.replace(/\n/g, `\n${itemIndentStr}`)
);
}
/**
* Wrap a string at whitespace, preserving existing line breaks.
* Wrapping is skipped if the width is less than `minWidthToWrap`.
*
* @param {string} str
* @param {number} width
* @returns {string}
*/
boxWrap(str, width) {
if (width < this.minWidthToWrap) return str;
const rawLines = str.split(/\r\n|\n/);
// split up text by whitespace
const chunkPattern = /[\s]*[^\s]+/g;
const wrappedLines = [];
rawLines.forEach((line) => {
const chunks = line.match(chunkPattern);
if (chunks === null) {
wrappedLines.push('');
return;
}
let sumChunks = [chunks.shift()];
let sumWidth = this.displayWidth(sumChunks[0]);
chunks.forEach((chunk) => {
const visibleWidth = this.displayWidth(chunk);
// Accumulate chunks while they fit into width.
if (sumWidth + visibleWidth <= width) {
sumChunks.push(chunk);
sumWidth += visibleWidth;
return;
}
wrappedLines.push(sumChunks.join(''));
const nextChunk = chunk.trimStart(); // trim space at line break
sumChunks = [nextChunk];
sumWidth = this.displayWidth(nextChunk);
});
wrappedLines.push(sumChunks.join(''));
});
return wrappedLines.join('\n');
}
}
/**
* Strip style ANSI escape sequences from the string. In particular, SGR (Select Graphic Rendition) codes.
*
* @param {string} str
* @returns {string}
* @package
*/
function stripColor(str) {
// eslint-disable-next-line no-control-regex
const sgrPattern = /\x1b\[\d*(;\d*)*m/g;
return str.replace(sgrPattern, '');
}
exports.Help = Help;
exports.stripColor = stripColor;

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const { InvalidArgumentError } = require('./error.js');
class Option {
/**
* Initialize a new `Option` with the given `flags` and `description`.
*
* @param {string} flags
* @param {string} [description]
*/
constructor(flags, description) {
this.flags = flags;
this.description = description || '';
this.required = flags.includes('<'); // A value must be supplied when the option is specified.
this.optional = flags.includes('['); // A value is optional when the option is specified.
// variadic test ignores <value,...> et al which might be used to describe custom splitting of single argument
this.variadic = /\w\.\.\.[>\]]$/.test(flags); // The option can take multiple values.
this.mandatory = false; // The option must have a value after parsing, which usually means it must be specified on command line.
const optionFlags = splitOptionFlags(flags);
this.short = optionFlags.shortFlag; // May be a short flag, undefined, or even a long flag (if option has two long flags).
this.long = optionFlags.longFlag;
this.negate = false;
if (this.long) {
this.negate = this.long.startsWith('--no-');
}
this.defaultValue = undefined;
this.defaultValueDescription = undefined;
this.presetArg = undefined;
this.envVar = undefined;
this.parseArg = undefined;
this.hidden = false;
this.argChoices = undefined;
this.conflictsWith = [];
this.implied = undefined;
}
/**
* Set the default value, and optionally supply the description to be displayed in the help.
*
* @param {*} value
* @param {string} [description]
* @return {Option}
*/
default(value, description) {
this.defaultValue = value;
this.defaultValueDescription = description;
return this;
}
/**
* Preset to use when option used without option-argument, especially optional but also boolean and negated.
* The custom processing (parseArg) is called.
*
* @example
* new Option('--color').default('GREYSCALE').preset('RGB');
* new Option('--donate [amount]').preset('20').argParser(parseFloat);
*
* @param {*} arg
* @return {Option}
*/
preset(arg) {
this.presetArg = arg;
return this;
}
/**
* Add option name(s) that conflict with this option.
* An error will be displayed if conflicting options are found during parsing.
*
* @example
* new Option('--rgb').conflicts('cmyk');
* new Option('--js').conflicts(['ts', 'jsx']);
*
* @param {(string | string[])} names
* @return {Option}
*/
conflicts(names) {
this.conflictsWith = this.conflictsWith.concat(names);
return 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' }));
*
* @param {object} impliedOptionValues
* @return {Option}
*/
implies(impliedOptionValues) {
let newImplied = impliedOptionValues;
if (typeof impliedOptionValues === 'string') {
// string is not documented, but easy mistake and we can do what user probably intended.
newImplied = { [impliedOptionValues]: true };
}
this.implied = Object.assign(this.implied || {}, newImplied);
return this;
}
/**
* Set environment variable to check for option value.
*
* An environment variable 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'.
*
* @param {string} name
* @return {Option}
*/
env(name) {
this.envVar = name;
return this;
}
/**
* Set the custom handler for processing CLI option arguments into option values.
*
* @param {Function} [fn]
* @return {Option}
*/
argParser(fn) {
this.parseArg = fn;
return this;
}
/**
* Whether the option is mandatory and must have a value after parsing.
*
* @param {boolean} [mandatory=true]
* @return {Option}
*/
makeOptionMandatory(mandatory = true) {
this.mandatory = !!mandatory;
return this;
}
/**
* Hide option in help.
*
* @param {boolean} [hide=true]
* @return {Option}
*/
hideHelp(hide = true) {
this.hidden = !!hide;
return this;
}
/**
* @package
*/
_concatValue(value, previous) {
if (previous === this.defaultValue || !Array.isArray(previous)) {
return [value];
}
return previous.concat(value);
}
/**
* Only allow option value to be one of choices.
*
* @param {string[]} values
* @return {Option}
*/
choices(values) {
this.argChoices = values.slice();
this.parseArg = (arg, previous) => {
if (!this.argChoices.includes(arg)) {
throw new InvalidArgumentError(
`Allowed choices are ${this.argChoices.join(', ')}.`,
);
}
if (this.variadic) {
return this._concatValue(arg, previous);
}
return arg;
};
return this;
}
/**
* Return option name.
*
* @return {string}
*/
name() {
if (this.long) {
return this.long.replace(/^--/, '');
}
return this.short.replace(/^-/, '');
}
/**
* Return option name, in a camelcase format that can be used
* as an object attribute key.
*
* @return {string}
*/
attributeName() {
if (this.negate) {
return camelcase(this.name().replace(/^no-/, ''));
}
return camelcase(this.name());
}
/**
* Check if `arg` matches the short or long flag.
*
* @param {string} arg
* @return {boolean}
* @package
*/
is(arg) {
return this.short === arg || this.long === arg;
}
/**
* Return whether a boolean option.
*
* Options are one of boolean, negated, required argument, or optional argument.
*
* @return {boolean}
* @package
*/
isBoolean() {
return !this.required && !this.optional && !this.negate;
}
}
/**
* This class is to make it easier to work with dual options, without changing the existing
* implementation. We support separate dual options for separate positive and negative options,
* like `--build` and `--no-build`, which share a single option value. This works nicely for some
* use cases, but is tricky for others where we want separate behaviours despite
* the single shared option value.
*/
class DualOptions {
/**
* @param {Option[]} options
*/
constructor(options) {
this.positiveOptions = new Map();
this.negativeOptions = new Map();
this.dualOptions = new Set();
options.forEach((option) => {
if (option.negate) {
this.negativeOptions.set(option.attributeName(), option);
} else {
this.positiveOptions.set(option.attributeName(), option);
}
});
this.negativeOptions.forEach((value, key) => {
if (this.positiveOptions.has(key)) {
this.dualOptions.add(key);
}
});
}
/**
* Did the value come from the option, and not from possible matching dual option?
*
* @param {*} value
* @param {Option} option
* @returns {boolean}
*/
valueFromOption(value, option) {
const optionKey = option.attributeName();
if (!this.dualOptions.has(optionKey)) return true;
// Use the value to deduce if (probably) came from the option.
const preset = this.negativeOptions.get(optionKey).presetArg;
const negativeValue = preset !== undefined ? preset : false;
return option.negate === (negativeValue === value);
}
}
/**
* Convert string from kebab-case to camelCase.
*
* @param {string} str
* @return {string}
* @private
*/
function camelcase(str) {
return str.split('-').reduce((str, word) => {
return str + word[0].toUpperCase() + word.slice(1);
});
}
/**
* Split the short and long flag out of something like '-m,--mixed <value>'
*
* @private
*/
function splitOptionFlags(flags) {
let shortFlag;
let longFlag;
// short flag, single dash and single character
const shortFlagExp = /^-[^-]$/;
// long flag, double dash and at least one character
const longFlagExp = /^--[^-]/;
const flagParts = flags.split(/[ |,]+/).concat('guard');
// Normal is short and/or long.
if (shortFlagExp.test(flagParts[0])) shortFlag = flagParts.shift();
if (longFlagExp.test(flagParts[0])) longFlag = flagParts.shift();
// Long then short. Rarely used but fine.
if (!shortFlag && shortFlagExp.test(flagParts[0]))
shortFlag = flagParts.shift();
// Allow two long flags, like '--ws, --workspace'
// This is the supported way to have a shortish option flag.
if (!shortFlag && longFlagExp.test(flagParts[0])) {
shortFlag = longFlag;
longFlag = flagParts.shift();
}
// Check for unprocessed flag. Fail noisily rather than silently ignore.
if (flagParts[0].startsWith('-')) {
const unsupportedFlag = flagParts[0];
const baseError = `option creation failed due to '${unsupportedFlag}' in option flags '${flags}'`;
if (/^-[^-][^-]/.test(unsupportedFlag))
throw new Error(
`${baseError}
- a short flag is a single dash and a single character
- either use a single dash and a single character (for a short flag)
- or use a double dash for a long option (and can have two, like '--ws, --workspace')`,
);
if (shortFlagExp.test(unsupportedFlag))
throw new Error(`${baseError}
- too many short flags`);
if (longFlagExp.test(unsupportedFlag))
throw new Error(`${baseError}
- too many long flags`);
throw new Error(`${baseError}
- unrecognised flag format`);
}
if (shortFlag === undefined && longFlag === undefined)
throw new Error(
`option creation failed due to no flags found in '${flags}'.`,
);
return { shortFlag, longFlag };
}
exports.Option = Option;
exports.DualOptions = DualOptions;

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const maxDistance = 3;
function editDistance(a, b) {
// https://en.wikipedia.org/wiki/DamerauLevenshtein_distance
// Calculating optimal string alignment distance, no substring is edited more than once.
// (Simple implementation.)
// Quick early exit, return worst case.
if (Math.abs(a.length - b.length) > maxDistance)
return Math.max(a.length, b.length);
// distance between prefix substrings of a and b
const d = [];
// pure deletions turn a into empty string
for (let i = 0; i <= a.length; i++) {
d[i] = [i];
}
// pure insertions turn empty string into b
for (let j = 0; j <= b.length; j++) {
d[0][j] = j;
}
// fill matrix
for (let j = 1; j <= b.length; j++) {
for (let i = 1; i <= a.length; i++) {
let cost = 1;
if (a[i - 1] === b[j - 1]) {
cost = 0;
} else {
cost = 1;
}
d[i][j] = Math.min(
d[i - 1][j] + 1, // deletion
d[i][j - 1] + 1, // insertion
d[i - 1][j - 1] + cost, // substitution
);
// transposition
if (i > 1 && j > 1 && a[i - 1] === b[j - 2] && a[i - 2] === b[j - 1]) {
d[i][j] = Math.min(d[i][j], d[i - 2][j - 2] + 1);
}
}
}
return d[a.length][b.length];
}
/**
* Find close matches, restricted to same number of edits.
*
* @param {string} word
* @param {string[]} candidates
* @returns {string}
*/
function suggestSimilar(word, candidates) {
if (!candidates || candidates.length === 0) return '';
// remove possible duplicates
candidates = Array.from(new Set(candidates));
const searchingOptions = word.startsWith('--');
if (searchingOptions) {
word = word.slice(2);
candidates = candidates.map((candidate) => candidate.slice(2));
}
let similar = [];
let bestDistance = maxDistance;
const minSimilarity = 0.4;
candidates.forEach((candidate) => {
if (candidate.length <= 1) return; // no one character guesses
const distance = editDistance(word, candidate);
const length = Math.max(word.length, candidate.length);
const similarity = (length - distance) / length;
if (similarity > minSimilarity) {
if (distance < bestDistance) {
// better edit distance, throw away previous worse matches
bestDistance = distance;
similar = [candidate];
} else if (distance === bestDistance) {
similar.push(candidate);
}
}
});
similar.sort((a, b) => a.localeCompare(b));
if (searchingOptions) {
similar = similar.map((candidate) => `--${candidate}`);
}
if (similar.length > 1) {
return `\n(Did you mean one of ${similar.join(', ')}?)`;
}
if (similar.length === 1) {
return `\n(Did you mean ${similar[0]}?)`;
}
return '';
}
exports.suggestSimilar = suggestSimilar;

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{
"versions": [
{
"version": "*",
"target": {
"node": "supported"
},
"response": {
"type": "time-permitting"
},
"backing": {
"npm-funding": true
}
}
]
}

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{
"name": "commander",
"version": "13.1.0",
"description": "the complete solution for node.js command-line programs",
"keywords": [
"commander",
"command",
"option",
"parser",
"cli",
"argument",
"args",
"argv"
],
"author": "TJ Holowaychuk <tj@vision-media.ca>",
"license": "MIT",
"repository": {
"type": "git",
"url": "git+https://github.com/tj/commander.js.git"
},
"scripts": {
"check": "npm run check:type && npm run check:lint && npm run check:format",
"check:format": "prettier --check .",
"check:lint": "eslint .",
"check:type": "npm run check:type:js && npm run check:type:ts",
"check:type:ts": "tsd && tsc -p tsconfig.ts.json",
"check:type:js": "tsc -p tsconfig.js.json",
"fix": "npm run fix:lint && npm run fix:format",
"fix:format": "prettier --write .",
"fix:lint": "eslint --fix .",
"test": "jest && npm run check:type:ts",
"test-all": "jest && npm run test-esm && npm run check",
"test-esm": "node ./tests/esm-imports-test.mjs"
},
"files": [
"index.js",
"lib/*.js",
"esm.mjs",
"typings/index.d.ts",
"typings/esm.d.mts",
"package-support.json"
],
"type": "commonjs",
"main": "./index.js",
"exports": {
".": {
"require": {
"types": "./typings/index.d.ts",
"default": "./index.js"
},
"import": {
"types": "./typings/esm.d.mts",
"default": "./esm.mjs"
},
"default": "./index.js"
},
"./esm.mjs": {
"types": "./typings/esm.d.mts",
"import": "./esm.mjs"
}
},
"devDependencies": {
"@eslint/js": "^9.4.0",
"@types/jest": "^29.2.4",
"@types/node": "^22.7.4",
"eslint": "^9.17.0",
"eslint-config-prettier": "^9.1.0",
"eslint-plugin-jest": "^28.3.0",
"globals": "^15.7.0",
"jest": "^29.3.1",
"prettier": "^3.2.5",
"ts-jest": "^29.0.3",
"tsd": "^0.31.0",
"typescript": "^5.0.4",
"typescript-eslint": "^8.12.2"
},
"types": "typings/index.d.ts",
"engines": {
"node": ">=18"
},
"support": true
}

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// Just reexport the types from cjs
// This is a bit indirect. There is not an index.js, but TypeScript will look for index.d.ts for types.
export * from './index.js';

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