Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/editor/config/schema/editor.schema.yml

@@ -0,0 +1,40 @@
+# Schema for the configuration files of the Editor module.
+
+editor.editor.*:
+  type: config_entity
+  label: 'Text editor'
+  mapping:
+    format:
+      type: string
+      label: 'Name'
+    editor:
+      type: string
+      label: 'Text editor'
+    settings:
+      type: editor.settings.[%parent.editor]
+    image_upload:
+      type: mapping
+      label: 'Image upload settings'
+      mapping:
+        status:
+          type: boolean
+          label: 'Status'
+        scheme:
+          type: string
+          label: 'File storage'
+        directory:
+          type: string
+          label: 'Upload directory'
+        max_size:
+          type: string
+          label: 'Maximum file size'
+        max_dimensions:
+          type: mapping
+          label: 'Maximum dimensions'
+          mapping:
+            width:
+              type: integer
+              label: 'Maximum width'
+            height:
+              type: integer
+              label: 'Maximum height'