Bundle size reduction roadmap

[kettanaito]

Roadmap

Bundling

• Double check that tree shaking is working properly
• Ensure Flow types are stripped in the production bundle
• Ensure Ramda methods are imported explicitly, without unnecessary code
• Ensure any kind of useless comments are stripped out in the production bundle

Architecture

• Remove ImmutableJS (Consider removing Immutable JS from peer dependencies #272)
• Remove invariant from the internal methods
• Replace Form methods with references to composite functions

[Vidlec]

Regarding Ramdas ifElse: https://github.com/ramda/ramda/blob/v0.25.0/source/ifElse.js
Not sure if it can be made significantly smaler. Also thats only 1.3kb not minified

[kettanaito]

@Vidlec I've tried replacing Ramda's method with identical one, except those don't have currying, and in average they are at least half smaller the size of the original Ramda methods.

That is, of course, subjective, but I've put it there to be considered.

[kettanaito]

@Vidlec, after some time I also came to conclusion that micro-optimization is not worth it. I would stick with Ramda's functions.

[kettanaito]

Proper imports of ramda (or the usage of babel-pluing-ramda) reduces the library's bundle size by ~50Kb.