pub.dartlang.org/mqtt5_client-3.1.3/lib/mqtt5_browser_client.dart:11:8: Error: Not found: 'dart:html' import 'dart:html';

[spich]

I got this on Web version.

lib/mqtt_browser_client.dart: Warning: Interpreting this as package URI, 'package:mojifinal/mqtt_browser_client.dart'.
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/mqtt5_client-3.1.3/lib/mqtt5_browser_client.dart:11:8: Error: Not found: 'dart:html'
import 'dart:html';
^
/C:/flutter/.pub-cache/hosted/pub.dartlang.org/mqtt5_client-3.1.3/lib/src/connectionhandling/browser/mqtt_browser_ws_connection.dart:51:16: Error: The method 'WebSocket' isn't defined for the class 'MqttBrowserWsConnection'.

• 'MqttBrowserWsConnection' is from 'package:mqtt5_client/mqtt5_browser_client.dart' ('/C:/flutter/.pub-cache/hosted/pub.dartlang.org/mqtt5_client-3.1.3/lib/mqtt5_browser_client.dart').
  Try correcting the name to the name of an existing method, or defining a method named 'WebSocket'.
  client = WebSocket(uriString, protocols);
  ^^^^^^^^^
  /C:/flutter/.pub-cache/hosted/pub.dartlang.org/mqtt5_client-3.1.3/lib/src/connectionhandling/browser/mqtt_browser_ws_connection.dart:114:16: Error: The method 'WebSocket' isn't defined for the class 'MqttBrowserWsConnection'.
• 'MqttBrowserWsConnection' is from 'package:mqtt5_client/mqtt5_browser_client.dart' ('/C:/flutter/.pub-cache/hosted/pub.dartlang.org/mqtt5_client-3.1.3/lib/mqtt5_browser_client.dart').
  Try correcting the name to the name of an existing method, or defining a method named 'WebSocket'.
  client = WebSocket(uriString, protocols);
  ^^^^^^^^^
  /C:/flutter/.pub-cache/hosted/pub.dartlang.org/mqtt5_client-3.1.3/lib/src/connectionhandling/browser/mqtt_browser_connection.dart:44:32: Error: 'MessageEvent' isn't a type.
  client.onMessage.listen((MessageEvent e) {
  ^^^^^^^^^^^^

Process finished with exit code 254

[shamblett]

I'm not sure what this means -

Warning: Interpreting this as package URI, 'package:mojifinal/mqtt_browser_client.dart'.

but it looks as though your are trying to use the browser client in a flutter environment, which is a server side dev env so you need the server client. The browser client is for use in flutter web development.