toddself · June 7, 2016 16:23 · Jun 7, 2016
diff --git a/model-something.js b/model-something.js
@@ -0,0 +1,31 @@
+const EventEmitter = require('events')
+
+function ComputedModel (props) {
+  const base = Object.create(new EventEmitter())
+  const keys = Object.keys(props)
+  for (let i = 0, len = keys.length; i < len; i++) {
+    const key = keys[i]
+    const prop = props[key]
+    Object.defineProperty(base, `_${key}`, {writable: true, value: prop})
+    if (typeof prop === 'function') {
+      Object.defineProperty(base, key, {
+        get: function () {
+          return this[`_${key}`]()
+        }
+      })
+    } else {
+      Object.defineProperty(base, key, {
+        enumerable: true,
+        get: function () {
+          return this[`_${key}`]
+        },
+        set: function (val) {
+          this[`_${key}`] = val
+          this.emit('set', {key: key, value: val})
+        }
+      })
+    }
+  }
+
+  return base
+}