Node-serial port as external module in webpack - module not found

问题

I'm trying to get node-serialport to work with electron and webpack.

I'm importing serialports as external module:

# webpack.config.js

externals: {
  serialport: "serialport"
}

This is the code in my app:

// read NMEA data from serial port
const SerialPort = require('serialport');
console.log(SerialPort.list());

const Readline = SerialPort.parsers.Readline;
const port = new SerialPort('/dev/tty.Redmi-ShareGPS', { baudRate: 4800 });
const parser = port.pipe(new Readline({ delimiter: '\r\n' }));



// Open errors will be emitted as an error event
port.on('error', function(err) {
  console.log(err.message);
})

// send NMEA data to GPS.js
parser.on('data', function(data) {
  // gps.update(data);
});

Trouble is in first line: const SerialPort = require('serialport');

Webpack compiles everything without error, but I have a browser console error:

Uncaught ReferenceError: serialport is not defined
    at Object.<anonymous> (bundle.js:65651)
    at __webpack_require__ (bundle.js:20)
    at Object.<anonymous> (bundle.js:65630)
    at __webpack_require__ (bundle.js:20)
    at Object.<anonymous> (bundle.js:31520)
    at __webpack_require__ (bundle.js:20)
    at Object.<anonymous> (bundle.js:25595)
    at __webpack_require__ (bundle.js:20)
    at _ol_ (bundle.js:63)
    at bundle.js:66

Which origins at this in webpack generated bundle.js:

/* 315 */
/***/ (function(module, exports, __webpack_require__) {

// read NMEA data from serial port
const SerialPort = __webpack_require__(316);
console.log(serialport.list());

const Readline = SerialPort.parsers.Readline;
const port = new SerialPort('/dev/tty.Redmi-ShareGPS', { baudRate: 4800 });
const parser = port.pipe(new Readline({ delimiter: '\r\n' }));

// Open errors will be emitted as an error event
port.on('error', function (err) {
  console.log(err.message);
});

// send NMEA data to GPS.js
parser.on('data', function (data) {
  // gps.update(data);
});

/***/ }),
/* 316 */
/***/ (function(module, exports) {

module.exports = serialport;

/***/ })
/******/ ]);

The error line is exactly module.exports = serialport;

According to webpack docs on externals, I suppose I somehow need to include serialport as a global variable, but the example is for jQuery which is a js file, and serialport is node module.

How to make it work?

回答1:

After many hours of frustration, I moved

const SerialPort = require('serialport');

from javascript file which is supposed to be bundled by webpack to index.html:

<script>
  const SerialPort = require('serialport');
</script>
<script src="dist/bundle.js"></script>

SerialPort is now recognized.

Also, it seems like webpack-dev-server doesn't work very well with Electron and serialport. I have to launch full electron app.

回答2:

Try remote.

You might also want to try using remote:

const SerialPort = require( "electron" ).remote.require( "serialport" );

来源：https://stackoverflow.com/questions/46442623/node-serial-port-as-external-module-in-webpack-module-not-found