title: compile file from file_pb.js to file.proto
body: <p>I know how could I compile from <code>file.proto</code> to <code>file_pb.js</code> using this command:</p>
  <pre><code>c:\protobuf\bin\protoc.exe --js_out=import_style=commonjs,binary:. .\file.proto
  </code></pre>
  <p>But, how I can convert from <code>file_pb.js</code> to <code>file.proto</code></p>