Logic
In essence, it is a normalizer that checks whether or not there is oveflow on the 'page' node. Case positive, it then checks if there already is a next page, then it splits the selection and wraps it around another node or just move the selection according to the former condition.
Usage
To use this package, install it through npm i with-pages-slate. Then, import it and extend the editor as follows:
// ... other imports
import { withPages } from 'with-pages-slate'
// then use it as a normal plugin
const editor = withPages(createEditor(), {
pageTypeName: 'node type', //custom node type that will represent your page node
emptyPage: Element //see [1] below
})
[1] an element to be rendered as your blank page everytime a page break occurs. Be aware that you need to declare your custom node type. Check the demo editor and Slate documentation on the subject for better comprehension