Move all modules to a single file

[jxnblk]

Moves all source code into a single file, for my sanity.

@TrySound I'm curious to know if this is a viable option to the problem that #258 attempts to solve (with the addition of some babel config changes and updates to the prepare step) – also riffing off of what you did in rebassjs/components#2

I'll likely merge this in regardless, but to clarify the hesitation with adding rollup to all the packages I maintain, I see it like this:

• Pure Node.js modules didn't use to require a build setup
• Babel helps make node modules compatible with browsers
• Adding another dev dependency and config (on top of babel) for small packages is a lot of overhead
• I think that dependencies should allow consumers to handle their own build setup however they like
• I want to support tree-shaking and help consumers create the smallest possible bundles they can
• I want a standardized way to support ES modules and tree shaking across all my projects, if possible

Ideally, packages like this could be written in a standard that wouldn't require any build setup at all, but I understand that we aren't there yet. Any guidance on this would be much appreciated

[codecov-io]

Codecov Report

Merging #282 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #282   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      1    -4     
  Lines         188    185    -3     
=====================================
- Hits          188    185    -3

Impacted Files	Coverage Δ
src/index.js	100% <100%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 18d7351...9c58a09. Read the comment docs.

[sapegin]

Correct me if I'm wrong, wouldn't it prevent tree shaking because now everything is in one module?

[TrySound]

@sapegin Importing from different files is not tree shaking. Bundler is smart enough to omit unused stuff from each module.

[TrySound]

@jxnblk I'm okay with this if you don't want to introduce rollup. However size-snapshot plugin is necessary to test treeshakability you want to achieve. If you want I could release standalone version.

[jxnblk]

Yeah, a dev tool for testing treeshakability is a nice to have

If you want I could release standalone version.

^^ by this do you mean add a plain Node/CLI API to the plugin? or did I misunderstand?

[TrySound]

Yes just a simple command which will wrap rollup+size snapshot plugin

[flybayer]

@jxnblk maybe https://github.com/developit/microbundle would be better than rollup for this?

[TrySound]

@flybayer microbundle is rollup but with some opinionated stuff included.

[jxnblk]

@flybayer Yeah, I've tried microbundle (like it conceptually) but doesn't seem to work super well across the packages I've tried it on