var humid = require('humid');
humid.find('/path/to/steam/library')
    .then(res => console.log)

// [ { id: 241600,
//     name: 'Rogue Legacy',
//     appPath: 'Rogue Legacy',
//     size: 337208904,
//     manifest: '/path/to/steam/library/steamapps/appmanifest_241600.acf' },
//   { id: 326410,
//     name: 'Windward',
//     appPath: 'Windward',
//     size: 137835724,
//     manifest: '/path/to/steam/library/steamapps/appmanifest_326410.acf' } ]