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1. readFile :: FilePath -> IO String

   Cabal-syntax	Distribution.Compat.Prelude

   The readFile function reads a file and returns the contents of the file as a string. The file is read lazily, on demand, as with getContents.

2. readFile :: FilePath -> IO String

   ghc-lib-parser	GHC.Prelude.Basic

   The readFile function reads a file and returns the contents of the file as a string. The file is read lazily, on demand, as with getContents.

3. readFile :: MonadSafe m => FilePath -> Producer' String m ()

   pipes-safe	Pipes.Safe.Prelude

   Read lines from a file, automatically opening and closing the file as necessary

4. readFile :: FilePath -> IO Bytes

   byteslice	Data.Bytes

   Read an entire file strictly into a Bytes.

5. readFile :: FilePath -> IO Chunks

   byteslice	Data.Bytes.Chunks

   Read an entire file strictly into chunks. If reading from a regular file, this makes an effort read the file into a single chunk.

6. readFile :: FilePath -> (Stream (Of String) IO () -> IO a) -> IO a

   streaming	Streaming.Prelude

   Read the lines of a file, using a function of the type: 'Stream (Of String) IO () -> IO a' to turn the stream into a value of type 'IO a'.

   >>> S.writeFile "lines.txt" $ S.take 2 S.stdinLn
   hello<Enter>
   world<Enter>
   
   >>> S.readFile "lines.txt" S.print
   "hello"
   "world"
   

7. readFile :: MonadIO m => FilePath -> m ByteString

   classy-prelude	ClassyPrelude

   Strictly read a file into a ByteString.

8. readFile :: FilePath -> IO String

   numeric-prelude	NumericPrelude

   The readFile function reads a file and returns the contents of the file as a string. The file is read lazily, on demand, as with getContents.

9. readFile :: FilePath -> IO String

   numeric-prelude	NumericPrelude.Base

   The readFile function reads a file and returns the contents of the file as a string. The file is read lazily, on demand, as with getContents.

10. readFile :: FilePath -> IO Text

    protolude	Protolude

    The readFile function reads a file and returns the contents of the file as a string. The entire file is read strictly, as with getContents. Beware that this function (similarly to readFile) is locale-dependent. Unexpected system locale may cause your application to read corrupted data or throw runtime exceptions about "invalid argument (invalid byte sequence)" or "invalid argument (invalid character)". This is also slow, because GHC first converts an entire input to UTF-32, which is afterwards converted to UTF-8. If your data is UTF-8, using decodeUtf8 . readFile is a much faster and safer alternative.

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