diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- /dev/null
+++ b/CHANGELOG.md
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+# 0.1.0.0
+
+Initial version.
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+
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diff --git a/src/Data/Wrapped.hs b/src/Data/Wrapped.hs
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--- /dev/null
+++ b/src/Data/Wrapped.hs
@@ -0,0 +1,213 @@
+-- Copyright 2019-2021 Google LLC
+--
+-- Licensed under the Apache License, Version 2.0 (the "License");
+-- you may not use this file except in compliance with the License.
+-- You may obtain a copy of the License at
+--
+--      http://www.apache.org/licenses/LICENSE-2.0
+--
+-- Unless required by applicable law or agreed to in writing, software
+-- distributed under the License is distributed on an "AS IS" BASIS,
+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+-- See the License for the specific language governing permissions and
+-- limitations under the License.
+
+-- | Provides 'Wrapped' and 'Wrapped1' types to hold @DerivingVia@ instances.
+
+{-# LANGUAGE DerivingVia #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE PolyKinds #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE StandaloneDeriving #-}
+{-# LANGUAGE TypeApplications #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE TypeOperators #-}
+{-# LANGUAGE UndecidableInstances #-}
+
+module Data.Wrapped
+         ( -- * Derived Instances
+           Wrapped(..), Wrapped1(..)
+           -- ** Wrapped 'Generic'
+           -- $Wrapped_Generic
+         , GSemigroup(..), GMonoid(..)
+           -- ** Wrapped 'IsList'
+           -- $Wrapped_IsList
+           -- ** Wrapped 'Foldable'
+           -- $Wrapped_Foldable
+         ) where
+
+import Control.Applicative (liftA2)
+import qualified Data.Foldable as F (toList)
+import Data.Function (on)
+import Data.Kind (Constraint, Type)
+import GHC.Exts (IsList(Item))
+import qualified GHC.Exts as Exts (IsList(..))
+import GHC.Generics
+         ( Generic(..), Generic1(..)
+         , M1(..), (:*:)(..), U1(..), K1(..)
+         )
+import Text.Read (Read(..), readListPrecDefault)
+
+-- | A type holding derived instances for classes of kind @Type -> Constraint@.
+--
+-- For example, 'Show' or @Pretty@.
+--
+-- Generally, instances derived from @SomeClass@ should be placed on
+-- @'Wrapped' SomeClass@.  This way, they can be grouped into relatively few
+-- deriving clauses per type.
+newtype Wrapped (c :: Type -> Constraint) a = Wrapped { unWrapped :: a }
+
+-- | A type holding derived instances of kind @(k -> Type) -> Constraint@.
+--
+-- For example, 'Functor' or 'Traversable'.
+--
+-- See also 'Wrapped'.
+newtype Wrapped1 (c :: (k -> Type) -> Constraint) f (a :: k) =
+  Wrapped1 { unWrapped1 :: f a }
+
+-- $Wrapped_Generic
+--
+-- Instances of @'Wrapped' 'Generic'@ work on 'Rep' types by 'to' and 'from'.
+--
+-- Typically these implement the "obvious" way to make a sum-of-products type
+-- (an algebraic data type) an instance of the given class.  For example, for
+-- 'Monoid', it provides field-wise 'mappend' and 'mempty' of types that are
+-- products of other 'Monoid's.
+--
+-- Likewise, @'Wrapped1' 'GHC.Generics.Generic1'@ works on 'GHC.Generics.Rep1'
+-- types by 'GHC.Generics.to1' and 'GHC.Generics.from1'.  This is the same
+-- concept applied to type constructors with one parameter.
+
+-- | Generic Semigroup.
+--
+-- Exported just to give Haddock something to link to; use @Wrapped Generic@
+-- with @-XDerivingVia@ instead.
+class GSemigroup f where
+  gsop :: f x -> f x -> f x
+
+instance GSemigroup U1 where
+  gsop = const $ const U1
+
+instance GSemigroup a => GSemigroup (M1 i c a) where
+  M1 a `gsop` M1 b = M1 $ a `gsop` b
+
+instance (GSemigroup f, GSemigroup g) => GSemigroup (f :*: g) where
+  (fa :*: ga) `gsop` (fb :*: gb) = (fa `gsop` fb) :*: (ga `gsop` gb)
+
+instance Semigroup a => GSemigroup (K1 i a) where
+  K1 fa `gsop` K1 ga = K1 $ fa <> ga
+
+-- | `<>` by field-wise `<>`.
+instance (Generic a, GSemigroup (Rep a)) => Semigroup (Wrapped Generic a) where
+  Wrapped a <> Wrapped b = Wrapped . to $ from a `gsop` from b
+
+-- | Generic Monoid.
+--
+-- Exported just to give Haddock something to link to; use @Wrapped Generic@
+-- with @-XDerivingVia@ instead.
+class GMonoid f where
+  gmempty :: f x
+
+instance GMonoid f => GMonoid (M1 i m f) where
+  gmempty = M1 gmempty
+
+instance (GMonoid f, GMonoid g) => GMonoid (f :*: g) where
+  gmempty = gmempty :*: gmempty
+
+instance GMonoid U1 where
+  gmempty = U1
+
+instance Monoid a => GMonoid (K1 i a) where
+  gmempty = K1 mempty
+
+-- | `mappend` by field-wise `<>`, and `mempty` by field-wise `mempty`
+--
+-- Beware: this determines the entire instance including `mappend`, so do not
+-- mix this with a `Semigroup` instance from another source.
+instance (Generic a, GSemigroup (Rep a), GMonoid (Rep a))
+      => Monoid (Wrapped Generic a) where
+  mempty = Wrapped $ to gmempty
+
+-- $Wrapped_IsList
+--
+-- Instances of @'Wrapped' 'IsList'@ work by conversion to/from list.
+--
+-- For example, we provide 'Eq', 'Ord', and 'Show' instances that convert both
+-- operands to lists and compare them, and a 'Read' instance that parses a list
+-- and converts to the desired type.
+--
+-- Whereas @Wrapped 'Foldable'@ requires that the type is a type constructor
+-- whose argument is the list element, this works on any type with an 'IsList'
+-- instance.
+--
+-- On the other hand, 'IsList' requires that the type can be converted /from/ a
+-- list, not only /to/ a list, so it can often require unneeded constraints
+-- compared to 'Foldable'.
+--
+-- Generally, if both of these compile, they should be expected to be
+-- equivalent.  More specifically, if you implement instances for @Wrapped
+-- Foldable@ or @Wrapped IsList@ these types, you should ensure that, as long
+-- as the 'Foldable' instance of @f@ and the 'IsList' instance of @f a@ are
+-- consistent, the instances are the same; and if you adopt instances from this
+-- type, you should ensure that your 'Foldable' and 'IsList' instances agree,
+-- and may then assume that 'IsList' and 'Foldable' give the same instances.
+
+-- | Just forwarding the instance; not meant to be used for deriving.
+deriving newtype instance IsList a => IsList (Wrapped IsList a)
+
+-- | Equality of the results of 'Exts.toList'.
+instance (IsList a, Eq (Item a)) => Eq (Wrapped IsList a) where
+  (==) = (==) `on` Exts.toList
+
+-- | Comparison of the results of 'Exts.toList'.
+instance (IsList a, Ord (Item a)) => Ord (Wrapped IsList a) where
+  compare = compare `on` Exts.toList
+
+-- | Show of the results of 'Exts.toList'.
+instance (IsList a, Show (Item a)) => Show (Wrapped IsList a) where
+  showsPrec p = showsPrec p . Exts.toList
+
+-- | 'Exts.fromList' of a parsed list.
+instance (IsList a, Read (Item a)) => Read (Wrapped IsList a) where
+  readPrec = fmap Exts.fromList $ readPrec @[Item a]
+  readListPrec = readListPrecDefault
+
+-- $Wrapped_Foldable
+--
+-- Instances of @'Wrapped' 'Foldable'@ work by folding over the type.
+--
+-- See above for a description of how this differs from @'Wrapped' 'IsList'@.
+
+-- | Just forwarding the instance; not meant to be used for deriving.
+deriving newtype instance Foldable f => Foldable (Wrapped1 Foldable f)
+
+-- | Equality of the results of 'F.toList'.
+instance (Foldable f, Eq a) => Eq (Wrapped1 Foldable f a) where
+  (==) = (==) `on` F.toList
+
+-- | Comparison of the results of 'F.toList'.
+instance (Foldable f, Ord a) => Ord (Wrapped1 Foldable f a) where
+  compare = compare `on` F.toList
+
+-- | Show of the results of 'Exts.toList'.
+instance (Foldable f, Show a) => Show (Wrapped1 Foldable f a) where
+  showsPrec p = showsPrec p . F.toList
+
+-- | Provide ('<>') by 'liftA2' of an underlying ('<>').
+instance (Applicative f, Semigroup a)
+      => Semigroup (Wrapped1 Applicative f a) where
+  (<>) = fmap Wrapped1 . (liftA2 (<>) `on` unWrapped1)
+
+-- | Provide 'mappend' by 'liftA2' and 'mempty' by @'pure' 'mempty'@.
+instance (Applicative f, Monoid m) => Monoid (Wrapped1 Applicative f m) where
+  mempty = Wrapped1 (pure mempty)
+
+-- | Forwarding instance for 'Functor'.
+--
+-- If we want @Wrapped1 Generic1 f@ to have instances for things with 'Functor'
+-- as a superclass, then it needs to have a 'Functor' instance.  There's not
+-- much point in providing a Generics-based one, though because @DeriveFunctor@
+-- exists.  So, just forward the underlying type's instance.
+deriving newtype instance Functor f => Functor (Wrapped1 Generic1 f)
diff --git a/wrapped.cabal b/wrapped.cabal
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--- /dev/null
+++ b/wrapped.cabal
@@ -0,0 +1,43 @@
+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.33.0.
+--
+-- see: https://github.com/sol/hpack
+--
+-- hash: e0afcb2bfa2caf82798dcda573c47f1043922eedabf3601cddf74ddf9e49e42e
+
+name:           wrapped
+version:        0.1.0.0
+synopsis:       Provides a single standardized place to hang DerivingVia instances.
+description:    This exports the newtypes 'Wrapped' and 'Wrapped1', which are meant to hold
+                typeclass implementations derived from other classes (most frequently,
+                'Generic' and 'Generic1').  If you implement a general instance of a class,
+                add it as an instance for 'Wrapped' or 'Wrapped1', and users will be able to
+                derive it uniformly as @deriving TheClass via Wrapped TheType@.
+category:       Generics
+homepage:       https://github.com/google/hs-wrapped#readme
+bug-reports:    https://github.com/google/hs-wrapped/issues
+author:         Andrew Pritchard <awpr@google.com>
+maintainer:     Andrew Pritchard <awpr@google.com>
+copyright:      2019-2021 Google LLC
+license:        Apache-2.0
+license-file:   LICENSE
+build-type:     Simple
+extra-source-files:
+  CHANGELOG.md
+
+source-repository head
+  type: git
+  location: https://github.com/google/hs-wrapped
+  subdir: wrapped
+
+library
+  exposed-modules:
+    Data.Wrapped
+  other-modules:
+    Paths_wrapped
+  hs-source-dirs:
+    src
+  build-depends:
+    base >=4.12 && <4.16
+  default-language: Haskell2010