DirectoryExists returns true if directory exists, false otherwise.

FileExists returns true if file exists, false otherwise.

ListFiles lists all files in a directory.

ListFilesByPrefix lists all files in directory with prefix.

MkdirAll creates all subdirectories in given path.

ReadFile reads the contents of a file specified by filepath WARNING: callers of this method should be extremely careful not to use it in a context where filepath is supplied by the user.

WriteFile is used to write a file.

ErrDirectoryExpected indicates that a directory was expected.

ErrFileExpected indicates that a file was expected.