npm install -g sfdc-generate-package

yarn globally add sfdc-generate-package

$ sgp -h

  Usage: sgp [options]

  generate package.xml from source

  Options:

    -h, --help                   output usage information
    -V, --version                output the version number
    -s, --src                    salesforce src directory path [./src]
    -a, --api-version            salesforce API version [40.0]
    -o, --output                 salesforce package.xml directory path [.]

  var sgp = require('sfdc-generate-package');

  sgp({
    'src':'', // salesforce src directory path : ./src
    '40.0':'', // salesforce API verion : 40.0
    'src':'' // salesforce src directory path : ./src
  }, console.log);