Combine UMD configs with rollup multiconfig and add size snapshot

[TrySound]

This will reduce cost of running node and loading rollup twice.

[codecov]

Codecov Report

Merging #678 into v8 will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff         @@
##             v8   #678   +/-   ##
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  Coverage   100%   100%           
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  Files        15     15           
  Lines       617    617           
  Branches    135    135           
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  Hits        617    617

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[gpbl]

Some more explanation please? :)

[TrySound]

I have a plan to distribute also cjs and esm bundles instead of many files. This will also reduce the cost of bundling vendors.

[TrySound]

Added rollup-plugin-size-snapshot. I created this plugin for improving bundles of frontend projects.

[gpbl]

I have a plan to distribute also cjs and esm bundles instead of many files. This will also reduce the cost of bundling vendors.

Sorry I don’t follow, could you explain? Thanks!

[gpbl]

Added rollup-plugin-size-snapshot. I created this plugin for improving bundles of frontend projects.

Which projects are you talking about? What does improve?

[TrySound]

Currently webpack or rollup to bundle react-day-picker dependency looks through all files spending the time of build. We can provide a single bundle like react itself does. So bundler will spend the time to resolve only one file per dependency.

Also with such bundle we will have better control over size which user consumes. size snapshot plugin have option to track treeshakability by creating internal bundle with import {} from 'react-day-picker'.

[TrySound]

Any thoughts?

[gpbl]

@TrySound thanks this work has landed into #944. Would love a review there, if you still have time :)