withThis method
JSFunction withThis(Same behavior as new JsFunction.withThis except that JavaScript "this" is not wrapped.
Source
static JSFunction withThis(Function f) native "JsFunction_withThisNoWrap";
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-js/JsNative/withThis.html