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That looks like it’s using the older interface. Things have changed a lot since then. The modern angular rewrites everything on the fly so that those things are no longer needed in your source HTML.
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It is the JavaScript output generated by dart2js
when you build a Dart web project using pub build
(Dart 1).
For Dart 2 build
is used instead and the browser
and dart_to_js_script_rewriter
packages are no longer necessary.
See also
– https://pub.dartlang.org/packages/build_runner
– https://pub.dartlang.org/packages/build
Source:stackexchange.com