util - add obj-proxy

app/scripts/lib/obj-proxy.js

@@ -0,0 +1,19 @@
+module.exports = function createObjectProxy(obj) {
+  let target = obj
+  const proxy = new Proxy({}, {
+    get: (obj, name) => {
+      // intercept setTarget
+      if (name === 'setTarget') return setTarget
+      return target[name]
+    },
+    set: (obj, name, value) => {
+      target[name] = value
+      return true
+    },
+  })
+  return proxy
+
+  function setTarget (obj) {
+    target = obj
+  }
+}