Mixed support

packages/core/src/mappers/renderer.ts

@@ -592,11 +592,12 @@ export const mapStateToControlProps = (
   const required =
     controlElement.scope !== undefined &&
     isRequired(ownProps.schema, controlElement.scope, rootSchema);
-  const resolvedSchema = Resolve.schema(
-    ownProps.schema || rootSchema,
-    controlElement.scope,
-    rootSchema
-  );
+  const resolvedSchema =
+    Resolve.schema(
+      ownProps.schema || rootSchema,
+      controlElement.scope,
+      rootSchema
+    ) ?? ownProps.schema; // if resolve fails then rely that the ownProps.schema if exist
   const errors = getErrorAt(path, resolvedSchema)(state);
 
   const description =
@@ -871,7 +872,21 @@ export const mapStateToArrayControlProps = (
   const { path, schema, uischema, label, ...props } =
     mapStateToControlWithDetailProps(state, ownProps);
 
-  const resolvedSchema = Resolve.schema(schema, 'items', props.rootSchema);
+  let resolvedSchema = Resolve.schema(schema, 'items', props.rootSchema);
+  if ((resolvedSchema as any) === true) {
+    // help the testers to determine the mixed control
+    resolvedSchema = {
+      type: [
+        'array',
+        'boolean',
+        'integer',
+        'null',
+        'number',
+        'object',
+        'string',
+      ],
+    };
+  }
   const childErrors = getSubErrorsAt(path, resolvedSchema)(state);
 
   return {

packages/core/src/util/resolvers.ts

@@ -123,6 +123,14 @@ const resolveSchemaWithSegments = (
   pathSegments: string[],
   rootSchema: JsonSchema
 ): JsonSchema => {
+  if (
+    typeof schema === 'boolean' &&
+    (!pathSegments || pathSegments.length === 0)
+  ) {
+    // add the case where the schema can be true value for example: items: true or additionalProperties: false
+    return schema;
+  }
+
   if (isEmpty(schema)) {
     return undefined;
   }

packages/examples/src/examples/json-editor.ts

@@ -0,0 +1,50 @@
+/*
+  The MIT License
+
+  Copyright (c) 2017-2019 EclipseSource Munich
+  https://github.com/eclipsesource/jsonforms
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files (the "Software"), to deal
+  in the Software without restriction, including without limitation the rights
+  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  copies of the Software, and to permit persons to whom the Software is
+  furnished to do so, subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be included in
+  all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+  THE SOFTWARE.
+*/
+import { registerExamples } from '../register';
+
+export const schema = {
+  type: ['array', 'boolean', 'integer', 'null', 'number', 'object', 'string'],
+  additionalProperties: true,
+  items: {
+    type: ['array', 'boolean', 'integer', 'null', 'number', 'object', 'string'],
+  },
+};
+
+export const uischema = {
+  type: 'Control',
+  scope: '#/',
+};
+
+const data = undefined as any;
+
+registerExamples([
+  {
+    name: 'json-editor',
+    label: 'JSON Editor',
+    data,
+    schema,
+    uischema,
+  },
+]);