Add support for theme customizer

lib/customizer.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Roots\Sage\Customizer;
+
+use Roots\Sage\Assets;
+
+/**
+ * Add postMessage support
+ */
+function customize_register($wp_customize) {
+  $wp_customize->get_setting('blogname')->transport = 'postMessage';
+}
+add_action('customize_register', __NAMESPACE__ . '\\customize_register');
+
+/**
+ * Customizer JS
+ */
+function customize_preview_js() {
+  wp_enqueue_script('sage/customizer', Assets\asset_path('scripts/customizer.js'), ['customize-preview'], null, true);
+}
+add_action('customize_preview_init', __NAMESPACE__ . '\\customize_preview_js');