install gulp to process code

node_modules/gulp-cli/lib/shared/config/cli-flags.js

@@ -0,0 +1,26 @@
+'use strict';
+
+var copyProps = require('copy-props');
+
+var fromConfigToCliOpts = {
+  'flags.silent': 'silent',
+  'flags.continue': 'continue',
+  'flags.series': 'series',
+  'flags.logLevel': 'logLevel',
+  'flags.compactTasks': 'compactTasks',
+  'flags.tasksDepth': 'tasksDepth',
+  'flags.sortTasks': 'sortTasks',
+};
+
+function mergeCliOpts(opts, config) {
+  opts = copyProps(opts, {});
+  return copyProps(config, opts, fromConfigToCliOpts, defaults);
+}
+
+function defaults(cfgInfo, optInfo) {
+  if (optInfo.value === undefined) {
+    return cfgInfo.value;
+  }
+}
+
+module.exports = mergeCliOpts;