💻

• Would you like to work on a fix?

How are you using Babel?

Programmatic API (babel.transform, babel.parse)

Input code

class C extends class {} {
  constructor() { new super() }
}

REPL

Configuration file name

No response

Configuration

REPL

Current and expected behavior

Current: The parser parses successfully
Expect: The parser should reject new super()

Environment

REPL

Possible solution

check callee.type in parseNewCallee.

Additional context

Per spec:

NewExpression[Yield, Await] :
    MemberExpression[?Yield, ?Await]
    new NewExpression[?Yield, ?Await] 

MemberExpression[Yield, Await] :
    PrimaryExpression[?Yield, ?Await]
    MemberExpression[?Yield, ?Await] [ Expression[+In, ?Yield, ?Await] ]
    MemberExpression[?Yield, ?Await] . IdentifierName
    MemberExpression[?Yield, ?Await] TemplateLiteral[?Yield, ?Await, +Tagged]
    SuperProperty[?Yield, ?Await]
    MetaProperty
    new MemberExpression[?Yield, ?Await] Arguments[?Yield, ?Await]
    MemberExpression[?Yield, ?Await] . PrivateIdentifier 

new super() is not covered by the NewExpression production since the MemberExpression production within new MemberExpression Arguments does not cover lone super.

V8/SM/JSC/TypeScript all reject this case.