This makes a few adjustments and improvements to our recently-added

configuration:


Decorators are now available. This uses Babel's "legacy" decorators,

  which just wrap the decorated item in a function call, as that's

  actually what TC39 recommends currently (the modern specs are too much

  in flux). This will be needed for Spina.


Improved our "globals" configuration for imports so that an import

  from, say, "jquery" will transpile to just using the $ namespace.

  This exists for all the modules we have registered as globals. This

  allows us to either import from the modules (recommended) or access

  the namespaces directly (allowed but should be legacy).


The TypeScript compiler no longer emits JavaScript or declaration

  files. This was polluting our tree. We'll eventually want to enable

  type declaration files, but not today.


Several TypeScript options were turned on to enable better Babel

  interoperability.


Our dependency on @beanbag/frontend-buildkit has been bumped to 1.1

for a couple new plugins (a TypeScript .d.ts bundler plugin for

rollup, and a plugin needed for experimental decorators).
Along with this, a package-lock.json has been added to the repository.

Installed the new dependencies and built static media. All media built

successfully.
Tested these configuration updates with some test changes for Spina

(coming in the next change).