import gulp from 'gulp';
import es from 'event-stream';
import nugetRestore from 'gulp-nuget-restore';

export default {
  /**
   * Task name
   * @type {String}
   */
  name: 'sitecore:nuget-restore',

  /**
   * Task description
   * @type {String}
   */
  description: 'Restore all nuget packages for solution.',

  /**
   * Task default configuration
   * @type {Object}
   */
  config: {
    deps: [],
  },

  /**
   * Task help options
   * @type {Object}
   */
  help: {
    'solution, -s': 'Solution file path',
  },

  /**
   * Task function
   * @param {object} config
   * @param {Function} end
   * @param {Function} error
   */
  fn(config, end, error) {
    if (!config.solution) {
      error('A solution file path was not set.');

      return;
    }

    gulp.src(config.solution)
      .pipe(nugetRestore())
      .pipe(es.through(() => {}))
        .on('end', end);
  },
};

import gulp from 'gulp';
import nugetRestore from 'gulp-nuget-restore';

export default {
  /**
   * Task name
   * @type {String}
   */
  name: 'sitecore:nuget-restore',

  /**
   * Task description
   * @type {String}
   */
  description: 'Restore all nuget packages for solution.',

  /**
   * Task default configuration
   * @type {Object}
   */
  config: {
    deps: [],
  },

  /**
   * Task help options
   * @type {Object}
   */
  help: {
    'solution, -s': 'Solution file path',
  },

  /**
   * Task function
   * @param {object} config
   * @param {Function} end
   * @param {Function} error
   */
  fn(config, end, error) {
    if (!config.solution) {
      error('A solution file path was not set.');

      return;
    }

    gulp.src(config.solution)
      .pipe(nugetRestore())
      .on('end', end);
  },
};

--- 
+++ 
@@ -1,4 +1,5 @@
 import gulp from 'gulp';
+import es from 'event-stream';
 import nugetRestore from 'gulp-nuget-restore';
 
 export default {
@@ -45,6 +46,7 @@
 
     gulp.src(config.solution)
       .pipe(nugetRestore())
-      .on('end', end);
+      .pipe(es.through(() => {}))
+        .on('end', end);
   },
 };
Add a noop pipe to ensure end is called
