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diff --git a/src/MdBlocks/Types.hs b/src/MdBlocks/Types.hs
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+++ b/src/MdBlocks/Types.hs
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+{-# LANGUAGE DeriveGeneric #-}
+
+module MdBlocks.Types where
+
+import Data.Aeson
+import Data.Map.Strict (Map)
+import Data.Text (Text)
+import GHC.Generics
+
+data BlockKind
+  = Fenced
+  | Indented
+  deriving (Show, Eq, Generic)
+
+instance ToJSON BlockKind
+
+data Metadata = Metadata
+  { mdLanguage :: Maybe Text
+  , mdId       :: Maybe Text
+  , mdAttrs    :: Map Text Text
+  }
+  deriving (Show, Eq, Generic)
+
+instance ToJSON Metadata
+
+data Block = Block
+  { blockFile    :: FilePath
+  , blockNumber  :: Int
+  , blockKind    :: BlockKind
+  , blockMeta    :: Metadata
+  , blockStart   :: Int
+  , blockEnd     :: Int
+  , blockContent :: Text
+  }
+  deriving (Show, Eq, Generic)
+
+instance ToJSON Block