fix(checkbox): Support optional boolean type for v0

v0/package.json

@@ -82,4 +82,4 @@
   "engines": {
     "node": ">=18.14.0"
   }
-}
+}

v0/src/helpers.js

@@ -579,7 +579,7 @@ export function extractParametersFromNode(schemaNode) {
       ...(presentation?.inputType === 'checkbox' && { checkboxValue: node.const }),
       // - For checkboxes with boolean value
       ...(presentation?.inputType === 'checkbox' &&
-        node.type === 'boolean' && {
+        hasType(node.type, 'boolean') && {
           // true is what describes this checkbox as a boolean, regardless if its required or not
           checkboxValue: true,
         }),

v0/src/tests/createHeadlessForm.test.js

@@ -2327,6 +2327,28 @@ describe('createHeadlessForm', () => {
           // Explained at "Given values from hidden fields, it does not thrown an error"
           expect(handleValidation({ has_pet: false, pet_is_cat: true }).formErrors).toBeUndefined();
         });
+
+        it('should set checkboxValue: true for optional boolean type', () => {
+          const schema = {
+            type: 'object',
+            properties: {
+              boolean_checkbox: {
+                title: 'Boolean Checkbox Test',
+                type: ['boolean', 'null'],
+                'x-jsf-presentation': {
+                  inputType: 'checkbox',
+                },
+              },
+            },
+            required: [],
+          };
+
+          const result = createHeadlessForm(schema);
+
+          const [optionalCheckbox] = result.fields;
+          expect(optionalCheckbox?.inputType).toBe('checkbox');
+          expect(optionalCheckbox?.checkboxValue).toBe(true);
+        });
       });
     });