RFC ReactSlim/Modern build

[iamdustan]

Calling it modern feels weird although modern and classic are the internal folder names.

There’s been some chatter about createClass and PropTypes being generally in maintenance mode as class and Flow are the future. I was playing around with the build system anyway (see #7850 and https://twitter.com/iamdustan/status/783701952483856384) so decided to try to create a build removing createClass and DOMFactories. Potentially createFactory and createMixin could be removed as well.

The build of react-slim.js vs react.js is displayed in the screenshot below:

Diff

react-slim vs react: -31,869
react-slim.min vs react.min: -5,755

Removing PropTypes may be problematic due to context still using it? This is part of an experiment I’m considering that would convert https://github.com/reactjs/react-codemod/blob/master/transforms/class.js to a babel transform to run over arbitrary components outside of direct control (aka babel over node_modules. Heresy, heresy!)

[iamdustan]

Naturally there are more snags that may impede the practicality of this. I’m looking at you mixins.

[gaearon]

We replaced the build system so closing. We'll get an equivalent into 16 though!

[iamdustan]

👍 Pretty sure 16 has improved on this already 😄