v4 breaking change: lib dir with cjs files removed

[srghma]

In v3 I used to import bindActionCreators from lib dir, that contained code compiled to cjs

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
const bindActionCreators = _interopRequireDefault(require('redux/lib/bindActionCreators'))

In v4 this is no longer possible.

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I cant use src dir too, because it's es

# will throw error because of the `export ....`
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
const bindActionCreators = _interopRequireDefault(require('redux/src/bindActionCreators'))

---

Workaround is

const bindActionCreators = require('redux').bindActionCreators

but it's bad for project size

Q: why not to return cjs compiled files?

[timdorr]

With a tree-shaking bundler, any unused imports will be automatically dropped. That won't apply to CJS files, but will work with ES modules.

This and other reasons are in the PR that changed this: #2358