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diff --git a/src/Text/Pandoc/Lua/Marshal/CommonState.hs b/src/Text/Pandoc/Lua/Marshal/CommonState.hs
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+++ b/src/Text/Pandoc/Lua/Marshal/CommonState.hs
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+{-# LANGUAGE OverloadedStrings    #-}
+{- |
+   Module      : Text.Pandoc.Lua.Marshal.CommonState
+   Copyright   : © 2012-2021 John MacFarlane
+                 © 2017-2021 Albert Krewinkel
+   License     : GNU GPL, version 2 or above
+   Maintainer  : Albert Krewinkel <tarleb+pandoc@moltkeplatz.de>
+   Stability   : alpha
+
+Instances to marshal (push) and unmarshal (peek) the common state.
+-}
+module Text.Pandoc.Lua.Marshal.CommonState
+  ( typeCommonState
+  , peekCommonState
+  , pushCommonState
+  ) where
+
+import HsLua.Core
+import HsLua.Marshalling
+import HsLua.Packaging
+import Text.Pandoc.Class (CommonState (..))
+import Text.Pandoc.Logging (LogMessage, showLogMessage)
+import Text.Pandoc.Lua.Marshal.List (pushPandocList)
+
+-- | Lua type used for the @CommonState@ object.
+typeCommonState :: LuaError e => DocumentedType e CommonState
+typeCommonState = deftype "pandoc CommonState" []
+  [ readonly "input_files" "input files passed to pandoc"
+      (pushPandocList pushString, stInputFiles)
+
+  , readonly "output_file" "the file to which pandoc will write"
+      (maybe pushnil pushString, stOutputFile)
+
+  , readonly "log" "list of log messages"
+      (pushPandocList (pushUD typeLogMessage), stLog)
+
+  , readonly "request_headers" "headers to add for HTTP requests"
+      (pushPandocList (pushPair pushText pushText), stRequestHeaders)
+
+  , readonly "resource_path"
+      "path to search for resources like included images"
+      (pushPandocList pushString, stResourcePath)
+
+  , readonly "source_url" "absolute URL + dir of 1st source file"
+      (maybe pushnil pushText, stSourceURL)
+
+  , readonly "user_data_dir" "directory to search for data files"
+      (maybe pushnil pushString, stUserDataDir)
+
+  , readonly "trace" "controls whether tracing messages are issued"
+      (pushBool, stTrace)
+
+  , readonly "verbosity" "verbosity level"
+      (pushString . show, stVerbosity)
+  ]
+
+peekCommonState :: LuaError e => Peeker e CommonState
+peekCommonState = peekUD typeCommonState
+
+pushCommonState :: LuaError e => Pusher e CommonState
+pushCommonState = pushUD typeCommonState
+
+typeLogMessage :: LuaError e => DocumentedType e LogMessage
+typeLogMessage = deftype "pandoc LogMessage"
+  [ operation Index $ defun "__tostring"
+      ### liftPure showLogMessage
+      <#> udparam typeLogMessage "msg" "object"
+      =#> functionResult pushText "string" "stringified log message"
+  ]
+  mempty -- no members