Don't transform declare class in plugin-proposal-class-properties

[forivall]

Q	A
Fixed Issues?	Fixes #13853
Patch: Bug Fix?	Yes
Major: Breaking Change?	No
Minor: New Feature?	No
Tests Added + Pass?	Not yet
Documentation PR Link
Any Dependency Changes?	No
License	MIT

In the Class visitor,

  if (path.node.declare) return;

has been added.

Also some typescript improvements in the typescript transform.

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Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/49238/

[nicolo-ribaudo]

I don't like that we throw an error, but plugin ordering is the hardest part of Babel's architecture so 🤷

[forivall]

@nicolo-ribaudo yeah, I struggled with figuring out how to get the plugin ordering just right and i've left a note: #13853 (comment) . Hopefully a future version of babel can manage plugin+preset ordering in a better way. Maybe something as simple as printing the effective config when an error like this is thrown.