negate.js

'use strict';

// How might I add my own support for --no-foo?

// 1. const { parseArgs } = require('node:util'); // from node
// 2. const { parseArgs } = require('@pkgjs/parseargs'); // from package
const { parseArgs } = require('..'); // in repo

const options = {
  ['color']: { type: 'string' },
  ['no-color']: { type: 'boolean' },
  ['logfile']: { type: 'string' },
  ['no-logfile']: { type: 'boolean' },
};
const { values, tokens } = parseArgs({ options, tokens: true });

// Reprocess the option tokens and overwrite the returned values.
tokens
  .filter((token) => token.kind === 'option')
  .forEach((token) => {
    if (token.name.startsWith('no-')) {
      // Store foo:false for --no-foo
      const positiveName = token.name.slice(3);
      values[positiveName] = false;
      delete values[token.name];
    } else {
      // Resave value so last one wins if both --foo and --no-foo.
      values[token.name] = token.value ?? true;
    }
  });

const color = values.color;
const logfile = values.logfile ?? 'default.log';

console.log({ logfile, color });

// Try the following:
//   node negate.js
//   node negate.js --logfile=test.log --color=red
//   node negate.js --no-logfile --no-color
//   node negate.js --no-logfile --logfile=test.log --color=red --no-color