Remove UMD format from default build outputs

[jaredpalmer]

It's really really slow to build for UMD and very very few modules really need to have a standalone <script> tag-ready output.

Thoughts @sw-yx ?

[TrySound]

I use umd dev/prod bundles to track library size with bundled dependencies for development and production.

[nstfkc]

@jaredpalmer I was going to ask the same thing. Hey @TrySound you can still use --format umd. I am creating a pr for this.

[swyxio]

i agree it should be a flag not a default. we’re gonna need a tsdxrc soon...

[jaredpalmer]

Not yet.

[aleclarson]

Maybe tsdx create should have a --umd flag that adds the umd:main entry to package.json.
Then tsdx build can just check package.json to know when to build the UMD bundle.