fix: enforce string value for feel: required

packages/zeebe-element-templates-json-schema/src/defs/properties.json

@@ -254,6 +254,25 @@
             }
           }
         }
+      },
+      {
+        "if": {
+          "properties": {
+            "feel": {
+                "const": "required"
+            }
+          },
+          "required": [
+            "feel"
+          ]
+        },
+        "then": {
+          "properties": {
+            "value": {
+              "type": "string"
+            }
+          }
+        }
       }
     ],
     "properties": {

packages/zeebe-element-templates-json-schema/test/fixtures/feel-value-mismatch.js

@@ -0,0 +1,81 @@
+export const template = {
+  name: 'Pattern Template',
+  id: 'com.example.PatternTemplate',
+  appliesTo: [
+    'bpmn:Task'
+  ],
+  properties: [
+    {
+      type: 'Text',
+      binding: {
+        type: 'zeebe:property',
+        name: 'prop'
+      },
+      feel: 'required',
+      value: 'valid'
+    },
+    {
+      type: 'Boolean',
+      binding: {
+        type: 'zeebe:property',
+        name: 'prop'
+      },
+      feel: 'required',
+      value: true
+    },
+    {
+      type: 'Number',
+      binding: {
+        type: 'zeebe:property',
+        name: 'prop'
+      },
+      feel: 'required',
+      value: 123
+    },
+  ]
+};
+
+export const errors = [
+  {
+    keyword: 'type',
+    dataPath: '/properties/1/value',
+    schemaPath: '#/allOf/1/items/allOf/9/then/properties/value/type',
+    params: { type: 'string' },
+    message: 'should be string'
+  },
+  {
+    keyword: 'if',
+    dataPath: '/properties/1',
+    schemaPath: '#/allOf/1/items/allOf/9/if',
+    params: { failingKeyword: 'then' },
+    message: 'should match "then" schema'
+  },
+  {
+    keyword: 'type',
+    dataPath: '/properties/2/value',
+    schemaPath: '#/allOf/1/items/allOf/9/then/properties/value/type',
+    params: { type: 'string' },
+    message: 'should be string'
+  },
+  {
+    keyword: 'if',
+    dataPath: '/properties/2',
+    schemaPath: '#/allOf/1/items/allOf/9/if',
+    params: { failingKeyword: 'then' },
+    message: 'should match "then" schema'
+  },
+  {
+    keyword: 'type',
+    dataPath: '',
+    schemaPath: '#/oneOf/1/type',
+    params: { type: 'array' },
+    message: 'should be array'
+  },
+  {
+    keyword: 'oneOf',
+    dataPath: '',
+    schemaPath: '#/oneOf',
+    params: { passingSchemas: null },
+    message: 'should match exactly one schema in oneOf'
+  }
+];

packages/zeebe-element-templates-json-schema/test/spec/validationSpec.js

@@ -145,6 +145,9 @@ describe('validation', function() {
     testTemplate('feel-type-mismatch');
 
 
+    testTemplate('feel-value-mismatch');
+
+
     testTemplate('language');