node_modules/node-gyp/lib/clean.js

module.exports = exports = clean
exports.usage = 'Removes any generated build files and the "out" dir'
/**
 * Module dependencies.
 */
var rm = require('rimraf')
var log = require('npmlog')
function clean (gyp, argv, callback) {
  // Remove the 'build' dir
  var buildDir = 'build'
  log.verbose('clean', 'removing "%s" directory', buildDir)
  rm(buildDir, callback)
}