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dart:html type error while adding event listener #35047

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ghost opened this issue Nov 4, 2018 · 0 comments
Open

dart:html type error while adding event listener #35047

ghost opened this issue Nov 4, 2018 · 0 comments
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area-web Use area-web for Dart web related issues, including the DDC and dart2js compilers and JS interop. web-libraries Issues impacting dart:html, etc., libraries

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@ghost
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ghost commented Nov 4, 2018

index.html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>test</title>
    <script defer src="index.dart.js"></script>
</head>
<body>
</body>
</html>

index.dart:

import 'dart:html' as html;

void main(){
  var listener = html.window.onMouseMove.listen((e) {})
    ..onData((e) {
      var messageData = {
        'y': e.client.y,
        'x': e.client.x,
      };
      print('message data is ${messageData}');
    });
}

pubspec.yaml:

name: crash_test
version: 0.0.1
description:
homepage:
documentation:
author:
environment:
  sdk: '>=2.0.0 <3.0.0'

dependencies:

dev_dependencies:
  build_runner: any
  build_web_compilers: any

build.yaml:

targets:
  $default:
    builders:
      build_web_compilers|entrypoint:
        options:
          compiler: dart2js
          dart2js_args:
            - --csp

steps to reproduce:

pub run build_runner build --output build

Run above command then open build/web/index.html then see console output, it will display this message:

js_helper.dart:1763 Uncaught Error: TypeError: Closure 'main_closure0': 
type '(MouseEvent) => Null' is not a subtype of type '(Event) => void'
    at Object.wrapException (js_helper.dart:1763)
    at Object.functionTypeCheck (js_helper.dart:3783)
    at Object.main (html_dart2js.dart:35700)
    at index.dart.js:5209
    at index.dart.js:5193
    at index.dart.js:5204
    at index.dart.js:5212

Above issue is resolved after passing these arguments to dart2js:

dart2js_args:
            - --fast-startup
            - --minify
            - --omit-implicit-checks
            - --trust-primitives
            - --csp
@dgrove dgrove added the web-libraries Issues impacting dart:html, etc., libraries label Nov 5, 2018
@vsmenon vsmenon added the area-web Use area-web for Dart web related issues, including the DDC and dart2js compilers and JS interop. label Jul 21, 2019
@vsmenon vsmenon removed their assignment Jul 23, 2019
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