vvakamecommandpost 
commandpost is a command-line options parser. This library is inspired by commander.
commander is very user-friendly, but not TypeScript-friendly. commandpost aims to improve this. Of course, commandpost can also be used from an ordinary JavaScript program. :+1:
Installation
$ npm install --save commandpost
How to Use
Basic Usage
$ cat cli.ts
import * as commandpost from "commandpost";
let root = commandpost
.create<{ spice: string[]; }, { food: string; }>("dinner <food>")
.version("1.0.0", "-v, --version")
.description("today's dinner!")
.option("-s, --spice <name>", "What spice do you want? default: pepper")
.action((opts, args) => {
console.log(`Your dinner is ${args.food} with ${opts.spice[0] || "pepper"}!`);
});
commandpost
.exec(root, process.argv)
.catch(err => {
if (err instanceof Error) {
console.error(err.stack);
} else {
console.error(err);
}
process.exit(1);
});
$ node cli.js --help
Usage: dinner [options] [--] <food>
Options:
-s, --spice <name> What spice do you want? default: pepper
$ node cli.js -s "soy sause" "fillet steak"
Your dinner is fillet steak with soy sause!
Commands
A top-level command is created by the commandpost.create function.
commandpost also supports sub-commands.
A sub-command is created by using the topLevelCommand.subCommand method.
Refer to this example for a demonstration.
commandpost can automatically generate help and command usage messages based on your configuration. For best results, it is recommended that you should set .version and .description for your top-level command.
Options
// shorthand & formal option with a required parameter. value is converted to string[].
cmd.option("-c, --config <configFile>", "Read setting from specified config file path");
// option with optional parameter. value is converted to string[].
cmd.option("-c, --config [configFile]", "Read setting from specified config file path");
// option without parameter (flag). option value is converted to boolean and defaults to `false`.
cmd.option("--suppress-warning", "Suppress warning");
// option with `--no-` prefix. option value is converted to boolean and defaults to true.
cmd.option("--no-type-checking", "Type checking disabled");
If you want to handle unknown options, you can use the .allowUnknownOption method.
Arguments
// required argument
commandpost.create<{}, { food: string; }>("dinner <food>");
// optional argument
commandpost.create<{}, { food: string; }>("dinner [food]");
// variadic argument
commandpost.create<{}, { foods: string[]; }>("dinner <food...>");
Examples
Contributing
This package's author, vvakame, is not a native English speaker. My first language is Japanese. If you find incorrect English, please send me a pull request.