isBuiltIn(obj)

Return true if obj is some type of JavaScript native built-in; false otherwise.

canReflect.isBuiltIn(null); // -> true
canReflect.isBuiltIn({}); // -> true
canReflect.isBuiltIn(1); // -> true
canReflect.isBuiltIn([]); // -> true
canReflect.isBuiltIn(function() {}); // -> true
canReflect.isBuiltIn("foo"); // -> true
canReflect.isBuiltIn(new Date()); // -> true
canReflect.isBuiltIn(/[foo].[bar]/); // -> true
canReflect.isBuiltIn(new DefineMap); // -> false

Not supported in browsers that have implementations of Map/Set where toString is not properly implemented to return [object Map]/[object Set].