How to make babel output classes as named functions?

Question

Right now it translates class X { ... } to var X = function X(...) { ... }, how do I make it output it as function X (...) { ... }?

Answer 1

The difference between function declarations and ES6 classes is that function declarations are hoisted:

console.log(Foo); // Foo
function Foo() {}

And classes are in temporal dead zone:

console.log(Foo); // ReferenceError
class Foo {}

It would be incorrect to transpile a class to function declaration, and the correct function representation of ES6 class is:

const Foo = function Foo() {};

Since there is no const in ES5, Babel transpiles it to var, also tries to mimic temporal dead zone where possible when respective transform is enabled.