I have a custom theme Mycompany/mytheme including <Magento>/<blank> as parent.

The locale is set to de_DE.

When I execute php bin/magento setup:static-content:deploy de_DE everything works fine, my custom-m.less and custom-l.less get compiled into custom-m.css and custom-l.css and I also get the Magento/blank theme files and viewing the magento website with chrome also loads these files.

custom-m.less and custom-l.less are exact copies from the blank themes styles-m and styles-l less files

The Problem:

Using grunt exec:mytheme and grunt less:mytheme kinda behaves strange. I still load the Magento/blank styles-l.css but everything else gets loaded via their own less component files (e.g. _extend.less or _module.less) enter image description here

Here is my grunt config file:


module.exports = {

    ... blank and luma stuff here

    mytheme: {
        area: 'frontend',
        name: 'Mycompany/mytheme',
        locale: 'de_DE',
        files: [
        dsl: 'less'

    ... backend stuff here ...


'css/styles-m', 'css/styles-l', 'css/email', 'css/email-inline' are not inside my mytheme, but as magento devdocs says should anyways be included because of the parent theme inheriting. I also tried to not include these files inside the config file = Same result

BTW: grunt commands throw no errors, seems to work fine, in var/view_preprocessed I see my custom files inside the Mycompany/mytheme folders, same as pub/static/frontend....

I deleted the cache after each new try

Server-side compilation enabled

developer mode enabled

Question: Can someone help me with this? Can someone explain whats wrong?

And what is the expected workflow? Magento Documentation is a bit unclear about that

  1. php bin/magento setup:static-content:deploy -> grunt watch ?
  2. php bin/magento setup:static-content:deploy -> grunt exec:mytheme -> grunt watch ?
  3. grunt exec:mytheme -> grunt watch ?

Should I use the magento php compiler at all? Because I don't want to, way too slow

  • There is two types of compilation in magento, you can compile via grunt or server side compilation. Which type are you used for it ? Commented Oct 13, 2016 at 17:42
  • as I described, using server-side compilation using php bin/magento setup:static-content deploy works fine. When I use grunt I get this strange behavior, as described above
    – juhanix
    Commented Oct 14, 2016 at 7:15

1 Answer 1


You need use Grunt for display source code inspecting in firebug and you have explain how it works.
Magento 2 - How to configure Grunt in PhpStorm

  • @juhanix Helped you with my answer?
    – St3phan
    Commented Sep 21, 2017 at 7:54

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