fix: ensure html content variables are included in getSchemaVariables

Closes #1047

packages/form-js-viewer/src/util/getSchemaVariables.js

@@ -32,6 +32,7 @@ const TEMPLATE_PROPERTIES = [
   'label',
   'source',
   'text',
+  'content',
   'url'
 ];
 

packages/form-js-viewer/test/spec/html.json

@@ -0,0 +1,10 @@
+{
+  "$schema": "../../../form-json-schema/resources/schema.json",
+  "type": "default",
+  "components": [
+    {
+      "type": "html",
+      "content": "<h1>{{heading}}</h1>\n<p>{{description}}</p>"
+    }
+  ]
+}

packages/form-js-viewer/test/spec/util/GetSchemaVariables.spec.js

@@ -19,6 +19,7 @@ import validateSchema from '../validate.json';
 import groupsSchema from '../groups.json';
 import shipsExampleSchema from '../ships-example.json';
 import iframesSchema from '../iframes.json';
+import htmlSchema from '../html.json';
 
 describe('util/getSchemaVariables', () => {
 
@@ -199,6 +200,18 @@ describe('util/getSchemaVariables', () => {
   });
 
 
+  it('should include variables in html', () => {
+
+    const variables = getSchemaVariables(htmlSchema);
+
+    expect(variables).to.eql([
+      'heading',
+      'description'
+    ]);
+
+  });
+
+
   it('should include variables in ships example', () => {
 
     const variables = getSchemaVariables(shipsExampleSchema);