code: def input(self, **kwargs):
          
          if self.infile is None and "{infile}" in self.command:
              if self.filename is None:
                  self.infile = NamedTemporaryFile(mode='wb', suffix=self.infile_ext)
                  self.infile.write(self.content.encode(self.default_encoding))
                  self.infile.flush()
                  self.options += (
                      ('infile', self.infile.name),
                  )
          return super(BaseCompiler, self).input(**kwargs)
docs: Specify temporary input file extension.
  
          Browserify requires explicit file extension (".js" or ".json" by default).
          https://github.com/substack/node-browserify/issues/1469