Dart: breaking change #46545: dropping support for ES5

[NewsBot]

A new Dart blog post/announcement has been posted!

Two years ago we announced a plan to deprecate support for ES5. Changes in priorities made us delay our plans until now. In an upcoming Dart release, dart2js will by default start generating code that uses ES6 features and as a result apps will no longer work in older browsers like IE11 that

Get the full details here: https://groups.google.com/a/dartlang.org/d/msg/announce/OpVD4pOPWnU/wKXMO5q_BQAJ

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