refactor(proxy-state-tree): extract proxy cache check to own method to increase readability

Author: FWeinb

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

@@ -145,11 +145,14 @@ export class Proxifier {
   getMutationTree() {
     return this.tree.master.mutationTree || (this.tree as IMutationTree<any>)
   }
-  private createArrayProxy(value, path) {
-    if (
+  private isProxyCached(value, path) {
+    return (
       value[this.CACHED_PROXY] &&
       String(value[this.CACHED_PROXY][PATH]) === String(path)
-    ) {
+    )
+  }
+  private createArrayProxy(value, path) {
+    if (this.isProxyCached(value, path)) {
       return value[this.CACHED_PROXY]
     }
 
@@ -253,10 +256,7 @@ export class Proxifier {
   }
 
   private createObjectProxy(object, path) {
-    if (
-      object[this.CACHED_PROXY] &&
-      String(object[this.CACHED_PROXY][PATH]) === String(path)
-    ) {
+    if (this.isProxyCached(object, path)) {
       return object[this.CACHED_PROXY]
     }