[Solved] What value does the empty statement evaluate to?

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The empty statement returns nothing at all (empty: “no value of any type”). A statement list, like the one in the body of a Script that eval is parsing the code as, returns the value of the last statement that did return anything:

The value of a StatementList is the value of the last value-producing
item in the StatementList. For example, the following calls to the
eval function all return the value 1:

eval("1;;;;;")
eval("1;{}")
eval("1;var a;")

An empty statement list, empty script, empty block, or statement list containing no value-producing statements evaluates to empty.

The PerformEval operation then converts that empty value to undefined in step 30:

If result.[[Type]] is normal and result.[[Value]] is empty, then
  Set result to NormalCompletion(undefined).

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solved What value does the empty statement evaluate to?