reconfig.js

// scripts/reconfig.js
//
//  Description:
//    Pass in a key as an argument with a value and it will merge the change
//    into the package.json.
//
//  Usage:
//    ./reconfig.js --$KEY_1_NAME $KEY_1_VALUE --$KEY_2_NAME --$KEY_2_VALUE
//    ./reconfig.js --homepage http://custom-homepage.com
//

var path = require('path');
var fs = require('fs');

var argv = require('minimist')(process.argv.slice(2));
var packageJson = require('../package');

var overrides = Object.assign({}, argv);

delete overrides._;

var updatedKeys = Object.keys(overrides);

if (!updatedKeys.length) {
  console.log('No keys in package.json to update. Exiting...');
  process.exit();
}

var newPackageJson = Object.assign({}, packageJson, overrides);

console.log('Updating package.json keys:', Object.keys(overrides));
console.log('');

fs.writeFileSync(
  path.join(__dirname, '../package.json'),
  JSON.stringify(newPackageJson, null, 2)
);

console.log('Updated package.json result:', newPackageJson);