what about:

class C extends makeClass() {}
var makeClass = function() {...}

We don't know whether the var was meaningfully hoisted out or not

functions are hoisted, vars are not. so we could add another clause for functions as well. that is all what i meant.

Their declarations are hoisted, which means they might be initialized earlier

makeClass = function() { ... }
class C extends makeClass() {}
var makeClass = function() {...}

We could check for let / const though

const/let should give you an error already if used before declaration.

so look like it is not worth the change then.. nevermind.