Integrating Action View Helpers

Using Rails view helpers (https://api.rubyonrails.org/classes/ActionView/Helpers.html) in components, pages and layouts is supported when using the approaches shown below;
Helpers without a block
Simple Action View helpers working without a block, can easily be integrated in a Matestack class response by calling plain:
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def response
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  plain t("my.locale")
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  # ...
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  plain link_to "Show", post_path(@post)
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  # ...
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  plain my_own_view_helper_method
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  # ...
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  plain any_method_returning_a_string
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end
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Helpers yielding a block
If you want to use a helper like form_for you have to follow following approach:
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def response
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  # ...
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  plain do # <-- add this
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    form_with url: "/some_path" do |f|
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      matestack_to_s do # <-- add this, which converst following block to a string
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        plain f.text_field :foo # <-- call plain here again
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        br
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        div class: "some-input-wrapper" do
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          plain f.text_field :bar
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        end
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        br
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        plain f.submit
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      end
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    end
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  end
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  # ...
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  plain do
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    link_to root_path do
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      matestack_to_s do
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        div class: "some-link-wrapper" do
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          plain "foo from block"
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        end
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      end
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    end
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  end
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  # ...
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  # Code below will not work!
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  plain link_to root_path do
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    matestack_to_s do
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      div class: "some-link-wrapper" do
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        plain "foo from block"
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      end
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    end
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  end
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end
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A component needs to be called in context of a controller (with included Matestack::Ui::Core::Helper), which is true when you're calling components from Rails views or on Matestack Pages/Layouts (which are themselves called by a controller normally).
When calling a component in isolation (which is possible), the view helpers might not work properly, especially when (implicitly) requiring a request object!
We're currently working on an improved way to integrate ActionView Helpers which will enable removing the plain calls from your code.

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Helpers without a block

Helpers yielding a block