Package renameio writes files atomically by renaming temporary files.
Pattern returns a glob pattern that matches the unrenamed temporary files created when writing to filename.
WriteFile is like ioutil.WriteFile, but first writes data to an arbitrary file in the same directory as filename, then renames it atomically to the final name.
That ensures that the final location, if it exists, is always a complete file.
WriteToFile is a variant of WriteFile that accepts the data as an io.Reader instead of a slice.