How to run Gulp tasks sequentially one after the other

Question

in the snippet like this    gulp task  coffee   - gt      gulp src  src server      coffee            pipe coffee  bare  true   on  error  gutil log           pipe gulp dest  bin    gulp task  clean  - gt      gulp src  bin    read false            pipe clean             force true  gulp task  develop    clean   coffee    - gt      console log  run something else    In develop task I want to run clean and after it s done  run coffee and when that s done  run something else  But I can t figure that out  This piece doesn t work  Please advise

User · Answer

I generated a node gulp app using the generator-gulp-webapp Yeoman generator   It handled the  clean conundrum  this way  translating to the original tasks mentioned in the question    gulp task  develop     clean    function        gulp start  coffee

User · Answer

According to the Gulp docs       Are your tasks running before the dependencies are complete  Make sure your dependency tasks are correctly using the async run hints  take in a callback or return a promise or event stream    To run your sequence of tasks synchronously    Return the event stream  e g  gulp src  to gulp task to inform the task of when the stream ends  Declare task dependencies in the second argument of gulp task    See the revised code   gulp task  coffee   - gt      return gulp src  src server      coffee            pipe coffee  bare  true   on  error  gutil log           pipe gulp dest  bin    gulp task  clean     coffee    - gt        return gulp src  bin    read false            pipe clean             force true  gulp task  develop    clean   coffee    - gt      console log  run something else

User · Answer

The only good solution to this problem can be found in the gulp documentation  var gulp   require  gulp        takes in a callback so the engine knows when it ll be done gulp task  one   function cb         do stuff -- async or otherwise   cb err      if err is not null and not undefined  the orchestration will stop  and  two  will not run         identifies a dependent task must be complete before this one begins gulp task  two     one    function          task  one  is done now      gulp task  default     one    two        alternatively  gulp task  default     two

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To wait and see if the task is finished and then the rest  I have it this way  gulp task  default     gulp series  set env   gulp parallel  build scss    minify js    minify ts    minify html    browser sync func    watch        function                Kudos  https   fettblog eu gulp-4-parallel-and-series

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run-sequence is the most clear way  at least until Gulp 4 0 is released   With run-sequence  your task will look like this   var sequence   require  run-sequence              gulp task  develop   function  done        sequence  clean    coffee   done         But if you  for some reason  prefer not using it  gulp start method will help   gulp task  develop     clean    function  done        gulp on  task stop   function  event            if  event task      coffee                 done                          gulp start  coffee          Note  If you only start task without listening to result  develop task will finish earlier than coffee  and that may be confusing   You may also remove event listener when not needed  gulp task  develop     clean    function  done        function onFinish event            if  event task      coffee                 gulp removeListener  task stop   onFinish               done                        gulp on  task stop   onFinish       gulp start  coffee          Consider there is also task err event you may want to listen to  task stop is triggered on successful finish  while task err appears when there is some error   You may also wonder why there is no official documentation for gulp start    This answer from gulp member explains the things       gulp start is undocumented on purpose because it can lead to complicated build files and we don t want people using it    source  https   github com gulpjs gulp issues 426 issuecomment-41208007

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For me it was not running the minify task after concatenation as it expects concatenated input and it was not generated some times    I tried adding to a default task in execution order and it didn t worked  It worked after adding just a return for each tasks and getting the minification inside gulp start   like below         Concatenate JavaScripts    gulp task  concat-js   function        return gulp src            js jquery js            js jquery-ui js            js bootstrap js            js jquery onepage-scroll js            js script js         pipe maps init         pipe concat  ux js         pipe maps write             pipe gulp dest  dist js                Minify JavaScript    gulp task  minify-js   function        return gulp src  dist js ux js        pipe uglify         pipe rename  ux min js         pipe gulp dest  dist js          gulp task  concat     concat-js    function       gulp start  minify-js         gulp task  default    concat        Source http   schickling me synchronous-tasks-gulp

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I was searching for this answer for a while  Now I got it in the official gulp documentation    If you want to perform a gulp task when the last one is complete  you have to return a stream    x000D   x000D  gulp task  wiredep     dev-jade    function      x000D      var stream   gulp src paths output      html   x000D           pipe   wiredep    x000D           pipe gulp dest paths output    x000D   x000D      return stream     execute next task when this is completed x000D      x000D   x000D     First will execute and complete wiredep task x000D  gulp task  prod-jade     wiredep    function     x000D      gulp src paths output         html   x000D           pipe   minifyHtml    x000D           pipe gulp dest paths output    x000D      x000D   x000D   x000D

User · Answer

By default  gulp runs tasks simultaneously  unless they have explicit dependencies   This isn t very useful for tasks like clean  where you don t want to depend  but you need them to run before everything else   I wrote the run-sequence plugin specifically to fix this issue with gulp   After you install it  use it like this   var runSequence   require  run-sequence     gulp task  develop   function done        runSequence  clean    coffee   function             console log  Run something else            done                  You can read the full instructions on the package README     it also supports running some sets of tasks simultaneously   Please note  this will be  effectively  fixed in the next major release of gulp  as they are completely eliminating the automatic dependency ordering  and providing tools similar to run-sequence to allow you to manually specify run order how you want   However  that is a major breaking change  so there s no reason to wait when you can use run-sequence today

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tried all proposed solutions  all seem to have issues of their own    If you actually look into the Orchestrator source  particularly the  start   implementation you will see that if the last parameter is a function it will treat it as a callback   I wrote this snippet for my own tasks           gulp task   task1        gt  console log a      gulp task   task2        gt  console log a      gulp task   task3        gt  console log a      gulp task   task4        gt  console log a      gulp task   task5        gt  console log a       function runSequential  tasks         if   tasks    tasks length  lt   0   return       const task   tasks 0       gulp start  task       gt            console log     task  finished             runSequential  tasks slice 1                    gulp task   run-all        gt  runSequential    task1    task2    task3    task4    task5

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Simply make coffee depend on clean  and develop depend on coffee   gulp task  coffee     clean    function          gulp task  develop     coffee    function            Dispatch is now serial  clean   8594  coffee   8594  develop  Note that clean s implementation and coffee s implementation must accept a callback   so the engine knows when it ll be done    gulp task  clean   function callback     del   dist      callback         In conclusion  below is a simple gulp pattern for a synchronous clean followed by asynchronous build dependencies     build sub-tasks gulp task  bar     clean    function          gulp task  foo     clean    function          gulp task  baz     clean    function                 main build task gulp task  build     foo    baz    bar         function           Gulp is smart enough to run clean exactly once per build  no matter how many of build s dependencies depend on clean  As written above  clean is a synchronization barrier  then all of build s dependencies run in parallel  then build runs

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It s not an official release yet  but the coming up Gulp 4 0 lets you easily do synchronous tasks with gulp series  You can simply do it like this   gulp task  develop   gulp series  clean    coffee      I found a good blog post introducing how to upgrade and make a use of those neat features   migrating to gulp 4 by example

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Gulp and Node use promises   So you can do this          require gulp  del  etc  function cleanTask       return del    dist        function bundleVendorsTask       return gulp src             pipe           pipe gulp dest             function bundleAppTask       return gulp src             pipe           pipe gulp dest             function tarTask       return gulp src             pipe           pipe gulp dest             gulp task  deploy   function deployTask          1  Run the clean task   cleanTask   then function             2  Clean is complete  Now run two tasks in parallel     Promise all         bundleVendorsTask          bundleAppTask          then function               3  Two tasks are complete  now run the final task        tarTask                        If you return the gulp stream  you can use the then   method to add a callback  Alternately  you can use Node s native Promise to create your own promises  Here I use Promise all   to have one callback that fires when all the promises resolve

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Try this hack  -   Gulp v3 x Hack for Async bug  I tried all of the  official  ways in the Readme  they didn t work for me but this did  You can also upgrade to gulp 4 x but I highly recommend you don t  it breaks so much stuff  You could use a real js promise  but hey  this is quick  dirty  simple  -  Essentially you use   var wait   0     flag to signal thread that task is done if wait    0  setTimeout        sleep and let nodejs schedule other threads   Check out the post

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I was having this exact same problem and the solution turned out to be pretty easy for me   Basically change your code to the following and it should work  NOTE  the return before gulp src made all the difference for me   gulp task  coffee   - gt      return gulp src  src server      coffee            pipe coffee  bare  true   on  error  gutil log           pipe gulp dest  bin    gulp task  clean  - gt      return gulp src  bin    read false            pipe clean             force true  gulp task  develop    clean   coffee    - gt      console log  run something else

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