Add fallback solutions for WP<5.2 where ClipboardJS doesn't exist yet.

Author: Clorith

gruntfile.js

@@ -73,6 +73,12 @@ module.exports = function( grunt ) {
 				src: [ '**/*', '!assets/*' ],
 				dest: 'build/',
 				expand: true
+			},
+			dependencies: {
+				cwd: 'node_modules/clipboard/dist/',
+				src: [ '**/*.min.js' ],
+				dest: 'build/assets/javascript/',
+				expand: true
 			}
 		},
 		jscs: {

package.json

@@ -7,6 +7,7 @@
   "devDependencies": {
     "@wordpress/browserslist-config": "^2.3.0",
     "autoprefixer": "^7.1.2",
+    "clipboard": "^2.0.4",
     "grunt": "~1.0.1",
     "grunt-check-dependencies": "~1.0.0",
     "grunt-checktextdomain": "~1.0.1",

src/includes/class-health-check.php

@@ -285,6 +285,10 @@ public function enqueues() {
 			}
 		}
 
+		if ( ! wp_script_is( 'clipboard', 'registered' ) ) {
+			wp_register_script( 'clipboard', trailingslashit( HEALTH_CHECK_PLUGIN_URL ) . 'assets/javascript/clipboard.min.js', array(), '2.0.4' );
+		}
+
 		wp_enqueue_style( 'health-check', trailingslashit( HEALTH_CHECK_PLUGIN_URL ) . 'assets/css/health-check.css', array(), HEALTH_CHECK_PLUGIN_VERSION );
 
 		wp_enqueue_script( 'health-check', trailingslashit( HEALTH_CHECK_PLUGIN_URL ) . 'assets/javascript/health-check.js', array( 'jquery', 'wp-a11y', 'clipboard', 'wp-util' ), HEALTH_CHECK_PLUGIN_VERSION, true );