Stop bundling external dependencies for cjs and esm bundles

[vlad-zhukov]

Currently formik bundles contain all external dependencies, which add unnecessary KBs to final app bundles.

Before: ~190KB
After: ~43KB

[jaredpalmer]

Maybe i don't understand, but at this point we might as well move all deps to peerDeps yes?

[Andarist]

Seems good to me 👍

As a side note while we are at optimizing things - any reason why formik includes it's own copy of hoistStatics? I have not compared it with original one, but seems to be 100% the same (except the copy is written in TS). You could probably shave some more bytes by removing this custom version and use the original one ( https://github.com/mridgway/hoist-non-react-statics ), cc @jaredpalmer

[Andarist]

Maybe i don't understand, but at this point we might as well move all deps to peerDeps yes?

Not really, deps will be installed by consumers automatically while peerDeps won't - which is obvious, so I guess I might have misunderstood your intent.

Anyway - the point of this PR is to keep deps as deps and let npm/yarn dedupe those dependencies when installing multiple packages, by bundling them into the source code you effectively prevent that.

[jaredpalmer]

The ts types were whack and I couldn't figure them out initially, was easier to write in TS, when I last checked like 6 months ago

[jaredpalmer]

@Andarist what's needed to solve the microbundle x prop-types issue?

[Andarist]

I'm not yet sure - need to investigate why it happens (how rollup-plugin-commonjs works) and maybe we could fix it upstream in the plugin - if not we can always hardcode "the fix" in microbundle's code.