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

core/modules/rest/config/schema/rest.schema.yml

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+# Schema for the configuration files of the REST module.
+
+rest.settings:
+  type: config_object
+  label: 'REST settings'
+  mapping:
+    resources:
+      type: sequence
+      label: 'Resources'
+      sequence:
+        type: rest_resource
+        label: 'Resource'
+    link_domain:
+      type: string
+      label: 'Domain of the relation'
+
+rest_resource:
+  type: mapping
+  mapping:
+    GET:
+      type: rest_request
+      label: 'GET method settings'
+    POST:
+      type: rest_request
+      label: 'POST method settings'
+    PATCH:
+      type: rest_request
+      label: 'PATCH method settings'
+    DELETE:
+      type: rest_request
+      label: 'DELETE method settings'
+
+rest_request:
+  type: mapping
+  mapping:
+    supported_formats:
+      type: sequence
+      label: 'Supported format'
+      sequence:
+        type: string
+        label: 'Format'
+    supported_auth:
+      type: sequence
+      label: 'Supported authentication'
+      sequence:
+        type: string
+        label: 'Authentication'

core/modules/rest/config/schema/rest.views.schema.yml

@@ -0,0 +1,34 @@
+# Schema for the views plugins of the REST module.
+
+views.display.rest_export:
+  type: views_display_path
+  label: 'REST display options'
+
+views.row.data_field:
+  type: views_row
+  label: 'Field row'
+  mapping:
+    field_options:
+      type: sequence
+      label: 'Options'
+      sequence:
+        type: mapping
+        label: 'Row'
+        mapping:
+          alias:
+            type: string
+            label: 'Alias for ID'
+          raw_output:
+            type: boolean
+            label: 'Raw output for ID'
+
+views.style.serializer:
+  type: views_style
+  label: 'Serialized output format'
+  mapping:
+    formats:
+      type: sequence
+      label: 'Formats'
+      sequence:
+        type: string
+        label: 'Format'