Everytime I run gulp anything I get a assertion error - Task function must be specified

Question

I m trying to run the command below but unfortunately I run into errors      gulp build   In my terminal and I get this assertion error  I ve uninstalled node and NPM and reinstalled again using brew - How do I completely uninstall Node js  and reinstall from beginning  Mac OS X  with these steps  My node version is v10 5 0 and npm version is 6 1 0    My system is MacOS High Sierra 10 13 2   assert js 269     throw err         AssertionError  ERR ASSERTION   Task function must be specified     at Gulp set  as  setTask   bulkit startup-kit node modules undertaker lib set-task js 10 3      at Gulp task  startup-kit node modules undertaker lib task js 13 8      at Object  lt anonymous gt       at Module  compile  internal modules cjs loader js 702 30      at Object Module  extensions  js  internal modules cjs loader js 713 10      at Module load  internal modules cjs loader js 612 32      at tryModuleLoad  internal modules cjs loader js 551 12      at Function Module  load  internal modules cjs loader js 543 3      at Module require  internal modules cjs loader js 650 17      at require  internal modules cjs helpers js 20 18    package json         name    bulkit-startup        version    0 0 1        description    Bulkit Startup Kit        main    Gruntfile js        devDependencies              autoprefixer     6 3 6            browser-sync     2 24 5            gulp     4 0 0            gulp-clean     0 3 2            gulp-concat     2 6 0            gulp-postcss     6 1 0            gulp-sass     2 2 0            gulp-sourcemaps     1 6 0            jquery     3 3 1            mq4-hover-shim     0 3 0            panini     1 3 0            rimraf     2 5 2              engines              node     gt  0 10 1              scripts              start    gulp            build    gulp build              repository              type    git            url    https   github com cssninjaStudio bulkit git              bugs              url    https   github com cssninjaStudio bulkit issues            email    support cssninja io              author    Css Ninja  lt hello cssninja io gt   https   cssninja io themes bulkit         license    Commercial        private   true       dependencies              bulma     0 7 0            del     3 0 0            jquery-waypoints     2 0 5            jquery counterup     2 1 0            scrollreveal     3 4 0            slick-carousel     1 8 1            wallop     2 4 1            gulpfile js  var gulp   require  gulp    var clean   require  gulp-clean    var sass   require  gulp-sass    var sourcemaps   require  gulp-sourcemaps    var postcss   require  gulp-postcss    var autoprefixer   require  autoprefixer    var mq4HoverShim   require  mq4-hover-shim    var rimraf   require  rimraf   sync  var browser   require  browser-sync    var panini   require  panini    var concat   require  gulp-concat    var port   process env SERVER PORT    8080  var nodepath     node modules    var assetspath     assets        Starts a BrowerSync instance gulp task  server     build    function        browser init  server      site   port  port            Watch files for changes gulp task  watch   function         gulp watch  scss          compile-scss   browser reload        gulp watch  sass          compile-sass   browser reload        gulp watch  js          copy-js   browser reload        gulp watch  images          copy-images   browser reload        gulp watch  html pages          compile-html         gulp watch   html  layouts includes helpers data            compile-html reset   compile-html         gulp watch     src  layouts partials helpers data           panini refresh            Erases the dist folder gulp task  reset   function         rimraf  bulma          rimraf  scss          rimraf  assets css          rimraf  assets fonts          rimraf  images              Erases the dist folder gulp task  clean   function         rimraf   site            Copy Bulma filed into Bulma development folder gulp task  setupBulma   function           Get Bulma from node modules     gulp src  nodepath    bulma   sass    pipe gulp dest  bulma          gulp src  nodepath    bulma      sass    pipe gulp dest  bulma              Copy static assets gulp task  copy   function           Copy other external font and data assets     gulp src   assets fonts         pipe gulp dest   site assets fonts          gulp src  nodepath    slick-carousel slick fonts         pipe gulp dest   site assets css fonts          gulp src  nodepath    slick-carousel slick ajax-loader gif    pipe gulp dest   site assets css             Theme Sass variables var sassOptions         errLogToConsole  true      outputStyle   compressed       includePaths   nodepath    bulma sass         Theme Scss variables var scssOptions         errLogToConsole  true      outputStyle   compressed       includePaths      scss partials          Compile Bulma Sass gulp task  compile-sass   function          var processors             mq4HoverShim postprocessorFor   hoverSelectorPrefix    is-true-hover               autoprefixer               browsers                     Chrome  gt   45                    Firefox ESR                    Edge  gt   12                    Explorer  gt   10                    iOS  gt   9                    Safari  gt   9                    Android  gt   4 4                    Opera  gt   30                                        cssnano                 Watch me get Sassy     return gulp src    bulma bulma sass            pipe sourcemaps init             pipe sass sassOptions  on  error   sass logError            pipe postcss processors            pipe sourcemaps write             pipe gulp dest     site assets css              Compile Theme Scss gulp task  compile-scss   function          var processors             mq4HoverShim postprocessorFor   hoverSelectorPrefix    is-true-hover               autoprefixer               browsers                     Chrome  gt   45                    Firefox ESR                    Edge  gt   12                    Explorer  gt   10                    iOS  gt   9                    Safari  gt   9                    Android  gt   4 4                    Opera  gt   30                                        cssnano                 Watch me get Sassy     return gulp src    scss core scss            pipe sourcemaps init             pipe sass sassOptions  on  error   sass logError            pipe postcss processors            pipe sourcemaps write             pipe gulp dest     site assets css              Compile Html gulp task  compile-html   function         gulp src  html pages      html            pipe panini           root   html pages            layouts   html layouts            partials   html includes            helpers   html helpers            data   html data                    pipe gulp dest   site             on  finish   browser reload        gulp task  compile-html reset   function done        panini refresh        done            Compile css from node modules gulp task  compile-css   function         return gulp src            nodepath    slick-carousel slick slick css           nodepath    slick-carousel slick slick-theme css           nodepath    wallop css wallop css             Additional static css assets         assetspath    css icons min css                   pipe concat  app css             pipe gulp dest     site assets css              Compile js from node modules gulp task  compile-js   function         return gulp src            nodepath    jquery dist jquery min js            nodepath    slick-carousel slick slick min js            nodepath    scrollreveal dist scrollreveal min js           nodepath    waypoints lib jquery waypoints min js           nodepath    waypoints lib shortcuts sticky min js           nodepath    jquery counterup jquery counterup min js           nodepath    wallop js Wallop min js             Additional static js assets         assetspath    js ggpopover ggpopover min js           assetspath    js ggpopover ggtooltip js           assetspath    js embed embed js           assetspath    js gmap gmap min js                   pipe concat  app js             pipe gulp dest     site assets js             Copy Theme js to production site gulp task  copy-js   function         gulp src  js      js            pipe gulp dest     site assets js             Copy images to production site gulp task  copy-images   function         gulp src  images                 pipe gulp dest     site assets images           gulp task  init     setupBulma     gulp task  build     clean   copy    compile-js    compile-css    copy-js    compile-sass    compile-scss    compile-html    copy-images     gulp task  default     server    watch

User · Accepted Answer

Gulp 4 0 has changed the way that tasks should be defined if the task depends on another task to execute  The list parameter has been deprecated   An example from your gulpfile js would be      Starts a BrowerSync instance gulp task  server     build    function      browser init  server      site   port  port          Instead of the list parameter they have introduced gulp series   and gulp parallel     This task should be changed to something like this      Starts a BrowerSync instance gulp task  server   gulp series  build   function      browser init  server      site   port  port           I m not an expert in this  You can see a more robust example in the gulp documentation for running tasks in series or these following excellent blog posts by Jhey Thompkins and Stefan Baumgartner   https   codeburst io switching-to-gulp-4-0-271ae63530c0  https   fettblog eu gulp-4-parallel-and-series

User · Answer

https   fettblog eu gulp-4-parallel-and-series   Because gulp task name  deps  func  was replaced by gulp task name  gulp  series parallel  deps  func     You are using the latest version of gulp but older code  Modify the code or downgrade

User · Answer

It s not good to keep changing the gulp  amp  npm versions in-order to fix the errors  I was getting several exceptions last days after reinstall my working machine  And wasted tons of minutes to re-install  amp  fixing those    So  I decided to upgrade all to latest versions    npm -v   v12 13 0  node -v   6 13 0 gulp -v   CLI version  2 2 0 Local version  4 0 2   This error is getting because of the how it has coded in you gulpfile but not the version mismatch   So  Here you have to change 2 things in the gulpfile to aligned with Gulp version 4  Gulp 4 has changed how initiate the task than Version 3     In version 4  you have to defined the task as a function  before call it as a gulp task by it s string name  In V3       gulp task  serve     sass    function            But in V4 it should be like   function serve           gulp task  serve   gulp series sass       As  Arthur has mentioned  you need to change the way of passing arguments to the task function  It was like this in V3       gulp task  serve     sass    function                           But in V4  it should be    gulp task  serve   gulp series sass

User · Answer

The problem is that you are using gulp 4 and the syntax in gulfile.js is of gulp 3. So either downgrade your gulp to 3.x.x or make use of gulp 4 syntaxes.

Syntax Gulp 3:

gulp.task('default', ['sass'], function() {....} );

Syntax Gulp 4:

gulp.task('default', gulp.series(sass), function() {....} );

You can read more about gulp and gulp tasks on: https://medium.com/@sudoanushil/how-to-write-gulp-tasks-ce1b1b7a7e81

User · Answer

I get the same error when using Gulp  The solution is to switch to Gulp version 3 9 1  both for the local version and the CLI version   sudo npm install -g gulp 3 9 1   Run in the project s folder  npm install gulp 3 9 1

User · Answer

Lower your gulp version in package json file to 3 9 1-    gulp     3 9 1

User · Answer

Steps     gulp     3 9 1   npm install gulp styles

User · Answer

You don t need to downgrade your gulp from gulp 4  Use gulp series   to combine multiple tasks  At first install gulp globally with  npm install --global gulp-cli   and then install locally on your working directory with  npm install --save-dev gulp  see details here  Example   package json       name    gulp-test      version    1 0 0      description          main    index js      scripts          test    echo   Error  no test specified    amp  amp  exit 1          author          license    ISC      devDependencies          browser-sync     2 26 3        gulp     4 0 0        gulp-sass     4 0 2          dependencies          bootstrap     4 3 1        jquery     3 3 1        popper js     1 14 7          gulpfile js  var gulp   require  gulp    var sass   require  gulp-sass    var browserSync   require  browser-sync   create        Specific Task function js         return gulp      src   node modules bootstrap dist js bootstrap min js    node modules jquery dist jquery min js    node modules popper js dist umd popper min js         pipe gulp dest  src js         pipe browserSync stream       gulp task js       Specific Task function gulpSass         return gulp      src   src scss   scss         pipe sass         pipe gulp dest  src css         pipe browserSync stream       gulp task gulpSass       Run multiple tasks gulp task  start   gulp series js  gulpSass      Run gulp start to fire multiple tasks  amp  run gulp js or gulp gulpSass for specific task

User · Answer

Try replacing your last line of gulpfile js  gulp task  default     server    watch       with  gulp task  default   gulp series  server    watch

[gulp] Everytime I run gulp anything, I get a assertion error. - Task function must be specified

package.json

gulpfile.js

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