Don't allow instance properties transformation on namespace

[thiagoarrais]

Trying to port babel/babel#10372

Please consider this as work-in-progress.

I've just started to port 10372, but I'm not really sure where and how to do it. Please let me know if there is something horribly out of place.

[nicolo-ribaudo]

Rather then in a polyfill provider, this should go in babel-plugin-inject-polyfills since it should be the same for all the providers, regardless of the polyfill that they are injecting.

https://github.com/nicolo-ribaudo/babel-polyfills/blob/6805c8d3427f9f0c6e6a44a1855a700b9b90a762/packages/babel-plugin-inject-polyfills/src/index.js#L200-L206

[thiagoarrais]

Thanks! That was exactly the kind of direction I needed. Will adapt the code as soon as possible.

[thiagoarrais]

I'm still undefined on where to move the tests to, but I've moved the namespace check to main injector.

[thiagoarrais]

Tests found a new home. I think this is done with 539242b. Just let me know if you need anything else.

[nicolo-ribaudo]

Thanks! It's perfect 👍