The best option when you don't know something about JS is check for it in the spec... ecma-international.org/ecma-262/10...
UnaryExpression: typeof UnaryExpression
UnaryExpression
val
Type(val)
Reference
IsUnresolvableReference(val)
true
"undefined"
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The best option when you don't know something about JS is check for it in the spec...
ecma-international.org/ecma-262/10...
UnaryExpression: typeofUnaryExpressionvalbe the result of evaluatingUnaryExpression.Type(val)isReference, then a. IfIsUnresolvableReference(val)istrue, return"undefined".