Webdev auto restart doesn't work properly

[svarl]

Environment:

Dart VM version: 2.7.0
webdev 2.5.4

How to start:

$ webdev serve --auto restart

I got an exception in browser console when i'm trying to do some changes in web/app/app_component.dart or any other files. That reporduce in the project https://github.com/svarl/quickstart.

VM442:1 Uncaught TypeError: window.$dartRunMain is not a function
    at <anonymous>:1:8
    at Object.runMain (client.js:7952)
    at client.js:23849
    at _wrapJsFunctionForAsync_closure.$protected (client.js:3003)
    at _wrapJsFunctionForAsync_closure.call$2 (client.js:10800)
    at Object._asyncStartSync (client.js:2968)
    at main__closure1.$call$body$main__closure (client.js:23861)
    at main__closure1.call$1 (client.js:23792)
    at StaticClosure._rootRunUnary [as call$2$5] (client.js:3303)
    at _CustomZone.runUnary$2$2 (client.js:12130)
    at _CustomZone.runUnaryGuarded$1$2 (client.js:12058)
    at _ControllerSubscription._sendData$1 (client.js:11601)
    at _DelayedData.perform$1 (client.js:11754)
    at _PendingEvents_schedule_closure.call$0 (client.js:11807)
    at Object._microtaskLoop (client.js:3168)
    at StaticClosure._startMicrotaskLoop (client.js:3174)
    at _AsyncRun__initializeScheduleImmediate_internalCallback.call$1 (client.js:10675)
    at invokeClosure (client.js:1188)
    at MutationObserver.<anonymous> (client.js:1207)

I think the reason why this is happening is *.bootstrap.js file contains invalid appModuleUri:

    if (childName === "app/app_component.css.shim.dart") { // should be main.dart
      // Clear static caches.
      dart_sdk.dart.hotRestart();
      window.$dartRunMain = child.main;
      return true;
    }

[jakemac53]

Confirmed this is due to app/app_component.css.shim.dart as you suggested (it should be main.dart). Likely we considered app/app_component.css.shim.dart as the primary input for the module.

One workaround is to move all but your main.dart file under your lib directory while we work on a fix.