Replace JS minifier with a custom all-discarding one

src/Text/Jasmine/Local.hs

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+{- This file is part of Vervis.
+ -
+ - Written in 2016 by fr33domlover <fr33domlover@riseup.net>.
+ -
+ - ♡ Copying is an act of love. Please copy, reuse and share.
+ -
+ - The author(s) have dedicated all copyright and related and neighboring
+ - rights to this software to the public domain worldwide. This software is
+ - distributed without any warranty.
+ -
+ - You should have received a copy of the CC0 Public Domain Dedication along
+ - with this software. If not, see
+ - <http://creativecommons.org/publicdomain/zero/1.0/>.
+ -}
+
+-- | Some of the handler and widget utilities Yesod provides include snippets
+-- of Javascript which gets inserted into the page. Usually there is no way to
+-- tell these utilities not to include the script. When you don't want it to be
+-- included, one way to avoid it to maintain modified versions of the
+-- utilities. Another, much easier way, is to use a modified Javascript
+-- minifier.
+--
+-- I don't know whether a modified minifier can be a good filter which discards
+-- some scripts and enables others, but there's definitely one case in which it
+-- works well: Discarding all scripts.
+--
+-- This module collects such modified minifiers.
+module Text.Jasmine.Local
+    ( discardm
+    , reportm
+    )
+where
+
+import Prelude
+
+import qualified Data.ByteString.Lazy as BL (ByteString, empty)
+
+discardm :: BL.ByteString -> Either String BL.ByteString
+discardm _ = Right BL.empty
+
+reportm :: BL.ByteString -> Either String BL.ByteString
+reportm _ = Left "The app disables all JS through the minifier"