feat: update to slate 0.5x (#10)

Update Slate-Collaboration to be compatible with Slate 0.5x versions.

packages/bridge/src/path/index.ts

@@ -1,38 +1,42 @@
-import { SyncDoc, Path } from '../model'
-import { NodeJSON } from 'slate'
+import { Node, Path } from 'slate'
 
-export const isTree = (node: NodeJSON): any => node && node.object !== 'text'
+import { SyncDoc } from '../model'
+
+export const isTree = (node: Node): boolean => Boolean(node?.children)
 
 export const getTarget = (doc: SyncDoc, path: Path) => {
   const iterate = (current: any, idx: number) => {
-    if (!isTree(current) || !current.nodes) {
+    if (!(isTree(current) || current[idx])) {
       throw new TypeError(
         `path ${path.toString()} does not match tree ${JSON.stringify(current)}`
       )
     }
 
-    return current.nodes[idx]
+    return current[idx] || current?.children[idx]
   }
 
-  return path.reduce(iterate, doc.document)
+  return path.reduce(iterate, doc)
 }
 
 export const getParentPath = (
   path: Path,
   level: number = 1
 ): [number, Path] => {
-  if (level > path.size) {
+  if (level > path.length) {
     throw new TypeError('requested ancestor is higher than root')
   }
 
-  return [path.get(path.size - level), path.slice(0, path.size - level) as Path]
+  return [path[path.length - level], path.slice(0, path.length - level)]
 }
 
 export const getParent = (
   doc: SyncDoc,
   path: Path,
   level = 1
-): [NodeJSON, number] => {
+): [any, number] => {
   const [idx, parentPath] = getParentPath(path, level)
+
   return [getTarget(doc, parentPath), idx]
 }
+
+export const getChildren = (node: Node) => node.children || node