Returns true
if the JavaScript object contains the specified property either directly or though its prototype chain.
This is the equivalent of the in
operator in JavaScript.
bool hasProperty(property) { if (property is! String && property is! num) { throw new ArgumentError("property is not a String or num"); } return JS('bool', '# in #', property, _jsObject); }
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https://api.dartlang.org/stable/2.0.0/dart-js/JsObject/hasProperty.html