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Filename : options-boolean-or-value.js

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#!/usr/bin/env node

// This is used as an example in the README for:
//    Other option types, flag|value
//    You can specify an option which functions as a flag but may also take a value (declared using square brackets).

// const commander = require('commander'); // (normal include)
const commander = require('../'); // include commander in git clone of commander repo
const program = new commander.Command();

program
  .option('-c, --cheese [type]', 'Add cheese with optional type');

program.parse(process.argv);

const options = program.opts();
if (options.cheese === undefined) console.log('no cheese');
else if (options.cheese === true) console.log('add cheese');
else console.log(`add cheese type ${options.cheese}`);

// Try the following:
//    node options-boolean-or-value
//    node options-boolean-or-value --cheese
//    node options-boolean-or-value --cheese mozzarella