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/Dart 2

warn method

void warn (Object arg)

Implementation

void warn(Object arg) =>
    _isConsoleDefined ? JS('void', 'window.console.warn(#)', arg) : null;

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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-html/Console/warn.html