Use null coalesce operator instead of ternary operator

composer.json

@@ -23,5 +23,10 @@
   "license": "GPL-2.0-or-later",
   "require-dev": {
       "drupal/coder": "^8.3.1"
+  },
+  "config": {
+    "allow-plugins": {
+      "dealerdirect/phpcodesniffer-composer-installer": true
+    }
   }
 }

inc/tokens.inc

@@ -122,7 +122,7 @@ function template_whisperer_tokens($type, $tokens, array $data, array $options,
 
     foreach ($tokens as $name => $original) {
       preg_match('/^.*?:(.*?)(:(.*)$|$)/', $name, $matches);
-      $action = isset($matches[1]) ? $matches[1] : '';
+      $action = $matches[1] ?? '';
       $rest = isset($matches[2]) ? ltrim($matches[2], ':') : '';
 
       switch ($action) {

src/Form/TemplateWhispererSuggestionForm.php

@@ -55,7 +55,7 @@ public function form(array $form, FormStateInterface $form_state) {
     $form['name'] = [
       '#title'         => $this->t('Name'),
       '#type'          => 'textfield',
-      '#default_value' => isset($entity->name) ? $entity->name : NULL,
+      '#default_value' => $entity->name ?? NULL,
       '#description'   => $this->t('The human-readable name. Will appear in the field widget.'),
       '#size'          => 50,
       '#required'      => TRUE,
@@ -64,7 +64,7 @@ public function form(array $form, FormStateInterface $form_state) {
     $form['suggestion'] = [
       '#title'         => $this->t('Suggestion'),
       '#type'          => 'textfield',
-      '#default_value' => isset($entity->suggestion) ? $entity->suggestion : NULL,
+      '#default_value' => $entity->suggestion ?? NULL,
       '#description'   => $this->t('A unique suggestion for this template whisperer. It must only contain lowercase letters, numbers, and underscores. E.g. <code>news_list</code>'),
       '#required'      => TRUE,
       '#size'          => 50,

src/Plugin/Field/FieldType/TemplateWhispererFieldItem.php

@@ -111,7 +111,7 @@ public function fieldSettingsForm(array $form, FormStateInterface $form_state) {
       '#type'          => 'checkboxes',
       '#title'         => $this->t('Available Suggestions'),
       '#options'       => $whisperers,
-      '#default_value' => isset($settings['handler']['suggestions']) ? $settings['handler']['suggestions'] : [],
+      '#default_value' => $settings['handler']['suggestions'] ?? [],
       '#description'   => $this->t('The suggestion(s) that can be referenced through this field. Leave empty to allow all.'),
     ];