The simplest way to resolve reexport conflicts. We have multiple modules
exporting symbols with the same name e.g. Options, which clash at reexport
time. TypeScript 1.7.x did not detect that error, but TypeScript 1.8
catches it.
Since TypeScript doesn't allow hiding or renaming a single member when
reexporting and exporting the rest, the alternative solution would be to
explicitly list all module members in ui.ts/ui.d.ts *and* keep them in sync
with every new release.
c9eb4d5890