dart2js中的代码为get $ functions抛出NoSuchMethodErrors

Question

My Polymer.dart web app, that works fine in Dartium, is giving the following error (it repeats seven times) when compiled with dart2js using pub build --mode=debug and loaded in Chrome.

Resource interpreted as Script but transferred with MIME type text/plain: "http://confab.dev/index.html_bootstrap.dart". confab.dev/:10
warning: file:///home/dan/projects/confabulous/webatara/web/index.html.0.dart library not found index.html_bootstrap.dart.js:17188
Uncaught Error: NoSuchMethodError: Cannot call "get$functions" on "#<JsLibraryMirror>" (Object #<JsLibraryMirror> has no method 'get$functions') index.html_bootstrap.dart.js:17188
Stack Trace: 
TypeError: Object #<JsLibraryMirror> has no method 'get$functions'
    at dart._loadLibrary (http://confab.dev/index.html_bootstrap.dart.js:20000:19)
    at dart._loadLibraries (http://confab.dev/index.html_bootstrap.dart.js:19917:11)
    at dart._initPolymerOptimized (http://confab.dev/index.html_bootstrap.dart.js:19908:7)
    at dart.initPolymer (http://confab.dev/index.html_bootstrap.dart.js:19902:7)
    at main (http://confab.dev/index.html_bootstrap.dart.js:4112:7)
    at _IsolateContext.eval$1 (http://confab.dev/index.html_bootstrap.dart.js:1369:23)
    at dart.startRootIsolate (http://confab.dev/index.html_bootstrap.dart.js:1145:21)
    at http://confab.dev/index.html_bootstrap.dart.js:26514:7
    at init.currentScript (http://confab.dev/index.html_bootstrap.dart.js:26494:5)
    at http://confab.dev/index.html_bootstrap.dart.js:26508:3
 index.html_bootstrap.dart.js:17188
Uncaught NoSuchMethodError: Cannot call "get$functions" on "#<JsLibraryMirror>" (Object #<JsLibraryMirror> has no method 'get$functions') index.html_bootstrap.dart.js:2369

Because source maps don't appear to work (they're turned on in Chrome, and I have .map files), I don't even know which part of my code is causing this.

I've tried with interop.js included both before dart.js, as the docs say , and after, as this issue says.

Answer 1

Looks like a bug in dart2js. Please file an issue, ideally with a reproducible test-case.

Answer 2

pub upgrade fixed it. It turns out that something had replaced the polymer 0.9.5 that I'd been using with 0.8.10+4. Quite odd. The solution to this is to set the polymer version as '>= 0.9.5' instead of 'any', which I will do eventually, but for now I'm interested to see if it happens again.