TouchList factory constructor
TouchList(NB: This constructor likely does not work as you might expect it to! This constructor will simply fail (returning null) if you are not on a device with touch enabled. See dartbug.com/8314.
Source
// TODO(5760): createTouchList now uses varargs. factory TouchList() => null;
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https://api.dartlang.org/stable/1.24.3/dart-html/TouchList/TouchList.html