> As you yourself point out, you were using features that weren't in a browser and needed a different transpiler to implement them. I think object spread still

> As you yourself point out, you were using features that weren't in a browser and needed a different transpiler to implement them. I think object spread still isn't even part of the standard(?) and you could imagine the standard diverging from the babel implementation of it, so the risk is mostly the same there. That's why there are stages and you should use at least stage 2 (draft) https://babeljs.io/docs/plugins/preset-stage-2/ https://babeljs.io/docs/plugins/preset-stage-2/