web: Running into NoSuchMethodError under build mode release

[markusrubey]

caught PlatformException(error, NoSuchMethodError: method not found: 'identify' (mixpanel.identify is not a function), null, null)
    at Object.f (http://localhost:8080/main.dart.js:5183:3)
    at agI.aj1 (http://localhost:8080/main.dart.js:86999:14)
    at http://localhost:8080/main.dart.js:87091:98
    at bq8.a (http://localhost:8080/main.dart.js:6454:62)
    at bq8.$2 (http://localhost:8080/main.dart.js:56414:14)
    at boF.$1 (http://localhost:8080/main.dart.js:56408:21)
    at asd.a5s (http://localhost:8080/main.dart.js:57087:34)
    at b9h.$0 (http://localhost:8080/main.dart.js:56699:11)
    at Object.KC (http://localhost:8080/main.dart.js:6564:40)
    at aV.yf (http://localhost:8080/main.dart.js:56631:3)
core_patch.dart:241 Uncaught PlatformException(error, NoSuchMethodError: method not found: 'set' on null, null, null)
    at Object.f (http://localhost:8080/main.dart.js:5183:3)
    at agI.aj1 (http://localhost:8080/main.dart.js:86999:14)
    at http://localhost:8080/main.dart.js:87091:98
    at bq8.a (http://localhost:8080/main.dart.js:6454:62)
    at bq8.$2 (http://localhost:8080/main.dart.js:56414:14)
    at boF.$1 (http://localhost:8080/main.dart.js:56408:21)
    at asd.a5s (http://localhost:8080/main.dart.js:57087:34)
    at b9h.$0 (http://localhost:8080/main.dart.js:56699:11)
    at Object.KC (http://localhost:8080/main.dart.js:6564:40)
    at aV.yf (http://localhost:8080/main.dart.js:56631:3)
2core_patch.dart:241 Uncaught PlatformException(error, NoSuchMethodError: method not found: 'register' (mixpanel.register is not a function), null, null)
    at Object.f (http://localhost:8080/main.dart.js:5183:3)
    at agI.aj1 (http://localhost:8080/main.dart.js:86999:14)
    at http://localhost:8080/main.dart.js:87091:98
    at bq8.a (http://localhost:8080/main.dart.js:6454:62)
    at bq8.$2 (http://localhost:8080/main.dart.js:56414:14)
    at boF.$1 (http://localhost:8080/main.dart.js:56408:21)
    at asd.a5s (http://localhost:8080/main.dart.js:57087:34)
    at b9h.$0 (http://localhost:8080/main.dart.js:56699:11)
    at Object.KC (http://localhost:8080/main.dart.js:6564:40)
    at aV.yf (http://localhost:8080/main.dart.js:56631:3)

I followed the set up instructions from pub dev and also checked your example here. I have no issues under debug. My call to Mixpanel.init throws no error.

I noticed I am missing some functionality in my main.dart.js when comparing:

Mixpanel Example main.dart.js

  A.Mixpanel.prototype = {
    hasOptedOutTracking$0() {
      var $async$goto = 0,
        $async$completer = A._makeAsyncAwaitCompleter(type$.nullable_bool),
        $async$returnValue;
      var $async$hasOptedOutTracking$0 = A._wrapJsFunctionForAsync(function($async$errorCode, $async$result) {
        if ($async$errorCode === 1)
          return A._asyncRethrow($async$result, $async$completer);
        while (true)
          switch ($async$goto) {
            case 0:
              // Function start
              $async$goto = 3;
              return A._asyncAwait(B.MethodChannel_0nx._invokeMethod$1$3$arguments$missingOk("hasOptedOutTracking", null, false, type$.bool), $async$hasOptedOutTracking$0);
            case 3:
              // returning from await.
              $async$returnValue = $async$result;
              // goto return
              $async$goto = 1;
              break;
            case 1:
              // return
              return A._asyncReturn($async$returnValue, $async$completer);
          }
      });
      return A._asyncStartSync($async$hasOptedOutTracking$0, $async$completer);
    },
    identify$1(distinctId) {
      if (distinctId.length !== 0)
        B.MethodChannel_0nx._invokeMethod$1$3$arguments$missingOk("identify", A.LinkedHashMap_LinkedHashMap$_literal(["distinctId", distinctId], type$.String, type$.dynamic), false, type$.void);
      else
        A.log0("`identify` failed: distinctId cannot be blank", "Mixpanel");
    },
    alias$2(alias, distinctId) {
      if (alias.length === 0) {
        A.log0("`alias` failed: alias cannot be blank", "mixpanel");
        return;
      }
      if (distinctId.length === 0) {
        A.log0("`alias` failed: distinctId cannot be blank", "Mixpanel");
        return;
      }
      B.MethodChannel_0nx._invokeMethod$1$3$arguments$missingOk("alias", A.LinkedHashMap_LinkedHashMap$_literal(["alias", alias, "distinctId", distinctId], type$.String, type$.dynamic), false, type$.void);
    },
    track$2$properties(_, eventName, properties) {
      if (eventName.length !== 0)
        B.MethodChannel_0nx._invokeMethod$1$3$arguments$missingOk("track", A.LinkedHashMap_LinkedHashMap$_literal(["eventName", eventName, "properties", properties], type$.String, type$.dynamic), false, type$.void);
      else
        A.log0("`track` failed: eventName cannot be blank", "Mixpanel");
    },
    track$1($receiver, eventName) {
      return this.track$2$properties($receiver, eventName, null);
    },
    getSuperProperties$0() {
      var $async$goto = 0,
        $async$completer = A._makeAsyncAwaitCompleter(type$.nullable_Map_dynamic_dynamic),
        $async$returnValue;
      var $async$getSuperProperties$0 = A._wrapJsFunctionForAsync(function($async$errorCode, $async$result) {
        if ($async$errorCode === 1)
          return A._asyncRethrow($async$result, $async$completer);
        while (true)
          switch ($async$goto) {
            case 0:
              // Function start
              $async$goto = 3;
              return A._asyncAwait(B.MethodChannel_0nx._invokeMethod$1$3$arguments$missingOk("getSuperProperties", null, false, type$.Map_dynamic_dynamic), $async$getSuperProperties$0);
            case 3:
              // returning from await.
              $async$returnValue = $async$result;
              // goto return
              $async$goto = 1;
              break;
            case 1:
              // return
              return A._asyncReturn($async$returnValue, $async$completer);
          }
      });
      return A._asyncStartSync($async$getSuperProperties$0, $async$completer);
    },
    getDistinctId$0() {
      var t1 = type$.String;
      return B.MethodChannel_0nx._invokeMethod$1$3$arguments$missingOk("getDistinctId", null, false, t1).then$1$1(new A.Mixpanel_getDistinctId_closure(), t1);
    },
    flush$0(_) {
      var $async$goto = 0,
        $async$completer = A._makeAsyncAwaitCompleter(type$.void);
      var $async$flush$0 = A._wrapJsFunctionForAsync(function($async$errorCode, $async$result) {
        if ($async$errorCode === 1)
          return A._asyncRethrow($async$result, $async$completer);
        while (true)
          switch ($async$goto) {
            case 0:
              // Function start
              $async$goto = 2;
              return A._asyncAwait(B.MethodChannel_0nx._invokeMethod$1$3$arguments$missingOk("flush", null, false, type$.dynamic), $async$flush$0);
            case 2:
              // returning from await.
              // implicit return
              return A._asyncReturn(null, $async$completer);
          }
      });
      return A._asyncStartSync($async$flush$0, $async$completer);
    }
  };

My Project main.dart.js

  A.Mixpanel.prototype = {
    track$2$properties(_, eventName, properties) {
      if (eventName.length !== 0)
        B.MethodChannel_0nx._invokeMethod$1$3$arguments$missingOk("track", A.LinkedHashMap_LinkedHashMap$_literal(["eventName", eventName, "properties", properties], type$.String, type$.dynamic), false, type$.void);
    }
  };
  

[bselwe]

I am also running into the same issue in production. Did you find any solution to that @markusrubey?

minified:jI: PlatformException(error, NoSuchMethodError: method not found: 'track' (mixpanel.track is not a function. (In 'mixpanel.track(o,A.ae(r))', 'mixpanel.track' is undefined)), null, null)

cc @zihejia

[DavidRG13]

Hi @bselwe, @zihejia and @markusrubey
I am facing this issue while running version 2.2.0 of the library locally in Chrome. Have you found a solution or workaround?
Thank you!

[adar2378]

Anyone found any fixes? Is this resolved in latest 2.3.0 version?

[yelkamel]

I have the same issue only on release mode for web.

And I'm block to the version 2.2.0 of mixpanel because to upgrade to 2.3.0

I need to change to much package in my app ...

• js ^0.7.1
• statsig ^1.0.0
• flame_audio ^2.10.1
• crisp_sdk: ^1.1.0

for the moment, I turned of mixpanel on web on my project :/