diff --git a/value.js b/value.js
new file mode 100644
index 0000000..2d022b4
--- /dev/null
+++ b/value.js
@@ -0,0 +1,21 @@
+module.exports = class Value {
+  constructor (value) {
+    this._value = value
+    this._needsRender = true
+  }
+
+  render () {
+    if (!this._needsRender) return false
+    this._needsRender = false
+    return true
+  }
+
+  get value () {
+    return this._value
+  }
+
+  set value (v) {
+    this._needsRender = true
+    this._value = v
+  }
+}