Error al usar el andamio básico de Polymer JS en el último lanzamiento de Dart Polymer

StackOverflow https://stackoverflow.com//questions/24018020

Pregunta

Después de escuchar que los componentes de Polymer JS deben funcionar fuera de la caja, lo que no lo hacen, seguí adelante e intenté usar algunos elementos Polymer JS en mi proyecto.

Necesitaba eliminar algunos archivos como Demo.html, metadata.html e index.html de todos los componentes JS y reemplazando. Esto es de modo que el transformador de polímero no incluya los archivos no deseados e innecesarios, más asegúrese de que utilice el archivo DART POLYMERS.HTML para evitar que se cargue dos veces.

Incluí el componente Core-Scaffold, y obtuve este error al ejecutar Pub Sirve en el último editor de DART. 

Build error:
Transform ScriptCompactor on gcanvas|web/index.html threw error: The null object does not have a method '>'.

NoSuchMethodError: method not found: '>'
Receiver: null
Arguments: [7]
dart:core-patch/object_patch.dart 45                                            Object.noSuchMethod
http://127.0.0.1:39312/packages/polymer_expressions/parser.dart 99:30           Parser._parseBinary
http://127.0.0.1:39312/packages/polymer_expressions/parser.dart 71:72           Parser._parsePrecedence
http://127.0.0.1:39312/packages/polymer_expressions/parser.dart 43:52           Parser._parseExpression
http://127.0.0.1:39312/packages/polymer_expressions/parser.dart 29:28           Parser.parse
http://127.0.0.1:39312/packages/polymer_expressions/parser.dart 12:56           parse
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 524:25  _HtmlExtractor._addExpression
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 509:23  _HtmlExtractor._processNormalElement.<fn>
dart:collection-patch/collection_patch.dart 957                                 _HashMap&&_LinkedHashMapMixin.forEach
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 495:28  _HtmlExtractor._processNormalElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 453:43  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 39:50                 TreeVisitor.visitElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 465:25  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 39:50                 TreeVisitor.visitElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 465:25  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 39:50                 TreeVisitor.visitElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 462:25  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 39:50                 TreeVisitor.visitElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 465:25  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 39:50                 TreeVisitor.visitElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 465:25  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 39:50                 TreeVisitor.visitElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 465:25  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 32:52                 TreeVisitor.visitDocument
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 16:52                 TreeVisitor.visit
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 187:61  _extractUsesOfMirrors
dart:async/zone.dart 730                                                        _rootRunUnary
dart:async/zone.dart 864                                                        _RootZone.runUnary
dart:async/future_impl.dart 488                                                 _Future._propagateToListeners.handleValueCallback
dart:async/future_impl.dart 571                                                 _Future._propagateToListeners
dart:async/future_impl.dart 555                                                 _Future._propagateToListeners.handleWhenCompleteCallback.<fn>
dart:async/zone.dart 730                                                        _rootRunUnary
dart:async/zone.dart 864                                                        _RootZone.runUnary
dart:async/future_impl.dart 488                                                 _Future._propagateToListeners.handleValueCallback
dart:async/future_impl.dart 571                                                 _Future._propagateToListeners
dart:async/future_impl.dart 331                                                 _Future._completeWithValue
dart:async/future_impl.dart 393                                                 _Future._asyncComplete.<fn>
dart:async/schedule_microtask.dart 23                                           _asyncRunCallbackLoop
dart:async/schedule_microtask.dart 32                                           _asyncRunCallback
dart:isolate-patch/isolate_patch.dart 128                                       _RawReceivePortImpl._handleMessage

dart:core                                                                       Object.noSuchMethod
http://127.0.0.1:39312/packages/polymer_expressions/parser.dart 99:30           Parser._parseBinary
http://127.0.0.1:39312/packages/polymer_expressions/parser.dart 71:72           Parser._parsePrecedence
http://127.0.0.1:39312/packages/polymer_expressions/parser.dart 43:52           Parser._parseExpression
http://127.0.0.1:39312/packages/polymer_expressions/parser.dart 29:28           Parser.parse
http://127.0.0.1:39312/packages/polymer_expressions/parser.dart 12:56           parse
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 524:25  _HtmlExtractor._addExpression
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 509:23  _HtmlExtractor._processNormalElement.<fn>
dart:collection                                                                 _HashMap&&_LinkedHashMapMixin.forEach
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 495:28  _HtmlExtractor._processNormalElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 453:43  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 39:50                 TreeVisitor.visitElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 465:25  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 39:50                 TreeVisitor.visitElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 465:25  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 39:50                 TreeVisitor.visitElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 462:25  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 39:50                 TreeVisitor.visitElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 465:25  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 39:50                 TreeVisitor.visitElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 465:25  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 39:50                 TreeVisitor.visitElement
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 465:25  _HtmlExtractor.visitElement
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 12:50                 TreeVisitor.visit
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 24:49                 TreeVisitor.visitChildren
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 30:48                 TreeVisitor.visitNodeFallback
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 32:52                 TreeVisitor.visitDocument
http://127.0.0.1:39312/packages/html5lib/dom_parsing.dart 16:52                 TreeVisitor.visit
http://127.0.0.1:39312/packages/polymer/src/build/script_compactor.dart 187:61  _extractUsesOfMirrors
dart:isolate                                                                    _RawReceivePortImpl._handleMessage
Build completed with 1 errors.
[web] GET /index.html => Could not find asset gcanvas|web/index.html.
[web] GET /favicon.ico => Could not find asset gcanvas|web/favicon.ico.

Lo rastreé hacia el panel de encabezado de núcleo componente, excluyendo, luego uno por uno, incluidos los componentes que se encuentran en el núcleo, hasta que volviera a fallar.

¿Alguien sabe dónde está este método '>'? ¿Y qué es nulo? A menos que quiera renunciar a usar el scaffold Core, este es un bloqueador. De todos modos, los pegados a continuación se encuentran los contenidos del archivo Bower.json y el Pubspec.yaml, en caso de que ayude.

Pubspec.yaml 

name: gcanvas
version: 0.0.5
author: James Hurford
description: Canvasing App for doorknocking campaigns.
environment:
  sdk: '>=1.0.0 <2.0.0'
dependencies:
  browser_detect: any
  csvparser: any
  http: any
  http_server: any
  lawndart: any
  mime: any
  polymer: any
  postgresql: any
  route: any
  uuid: any
dev_dependencies:
  scheduled_test: any
transformers:
- polymer:
    entry_points:
    - web/index.html

Bower.Json 

{
  "name": "gcanvas",
  "version": "0.0.0",
  "authors": [
    "James Hurford"
  ],
  "private": true,
  "ignore": [
    "**/.*",
    "node_modules",
    "bower_components",
    "test",
    "tests"
  ],
  "dependencies": {
    "x-tag-imports": "x-tag/x-tag-imports",
    "polymer-ui-tabs": "polymer/polymer-ui-tabs#~0.3.0",
    "core-scaffold": "polymer/core-scaffold#~0.3.1"
  },
  "resolutions": {
    "platform": ">=0.3.0 <1.0.0"
  }
}

gracias

¿Fue útil?

Solución

Desde el aspecto del código donde se lanzó la excepción, parece que el transformador Polmyer intenta procesar el archivo HTML y las expresiones de enlace. Esto parece un insecto o una característica faltante en Polymer_Expressions y es posible el transformador de polímero DART.Sospecho este código en el panel de encabezado de polímero <div id="mainContainer" flex?="{{mode !== 'cover'}}" on-scroll="{{scroll}}"> is causing the exception at the unknown operator !==

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