bower/lib/core/config.js

var path = require('path');

var temp = process.env.TMPDIR
 || process.env.TMP
 || process.env.TEMP
 || process.platform === 'win32' ? 'c:\\windows\\temp' : '/tmp';

var home = (process.platform === 'win32'
  ? process.env.USERPROFILE
  : process.env.HOME) || temp;

var cache = process.platform === 'win32'
  ? path.resolve(process.env.APPDATA || home || temp, 'bower-cache')
  : path.resolve(home || temp, '.bower');

// Bower Config
module.exports = require('rc') ('bower', {
    cache      :  cache,
    json       : 'component.json',
    endpoint   : 'https://bower.herokuapp.com',
    directory  : 'components'
});