How to evaluate a constant expression?

[levi-nz]

I have a JavaScript expression like:

(-2473 * -2 + 17 * 447 + -12264)

I want to evaluate it to a value (f64) from an Expr. I found the Evaluator struct but I'm not sure how to use it. Here's what I've tried:

let mut evaluator = Evaluator::new(
                Module {
                    span: Default::default(),
                    body: vec![ModuleItem::Stmt(Stmt::Expr(ExprStmt {
                        span: Default::default(),
                        expr: Box::new(Expr::Bin(expr.clone())),
                    }))],
                    shebang: None,
                },

                Marks::new()
            );
let result = evaluator.eval(&Expr::Bin(expr));

However the result is None. How can I evaluate an expression like this? I want to do it in a visitor, so I don't have access to a Module, and the input is also a script, not a module.

[kdy1]

You need to clone the whole Module

[levi-nz]

What about Marks, and do I need to do anything special if I'm using swc::Compiler?

I did try clone the Module in visit_mut_program but still the same result unfortunately