Invoked when a non-existent method or property is accessed.
Classes can override noSuchMethod to provide custom behavior.
If a value is returned, it becomes the result of the original invocation.
The default behavior is to throw a NoSuchMethodError.
external dynamic noSuchMethod(Invocation invocation);
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https://api.dartlang.org/stable/2.0.0/dart-core/Object/noSuchMethod.html