fix(proxy-state-tree): fix function to avoid breaking types being exported

Author: gaspard

packages/node_modules/proxy-state-tree/src/Proxyfier.ts

@@ -93,7 +93,9 @@ export class Proxifier {
   shouldTrackMutations(path) {
     return (
       this.tree.master.options.devmode ||
-      (path && this.tree.master.pathDependencies[path])
+      // We need the !! to avoid weird types for shouldTrackMutations that
+      // actually break (because they contain references to 'src')
+      !!(path && this.tree.master.pathDependencies[path])
     )
   }