Fetching application/dart script unsuopported

Question

I have my index.html file setup for a dart application like this:

<!DOCTYPE html>
<html>
  <head>
    <title>basic_app</title>
    <script defer src="main.dart" type="application/dart"></script>
    <script defer src="packages/browser/dart.js"></script>
  </head>
  <body>
  </body>
</html>

Chrome has started throwing a warning at me that says:

Fetching scripts with an invalid type/language attributes is deprecated and will be removed in M56, around January 2017. See https://www.chromestatus.com/features/5760718284521472 for more details.

What do I have to change to get rid of this warning? I believe it is caused by this line:

<script defer src="main.dart" type="application/dart"></script>

Günter Zöchbauer · Accepted Answer · 2017-01-14 10:39:48Z

2

Chrome doesn't know about Dart, only Dartium can load Dart script tags. pub build doesn't remove the Dart script tag. There is the dart_to_js_script_rewriter transformer that removes that Dart script tag so that only the dart2js-transpiled JS code is loaded in production:

Add the package as dev_dependency`

dev_dependencies:
  dart_to_js_script_rewriter: ^1.0.1

and the transformer configuration at the end of the transformers configuratino:

transformers:
- dart_to_js_script_rewriter

answered Jan 14, 2017 at 10:39

Günter Zöchbauer

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