Fix 4448: preserve empty string titles in oneOf/anyOf options list

CHANGELOG.md

@@ -86,6 +86,7 @@ should change the heading of the (upcoming) version to include a major version b
 - Updated `Experimental_DefaultFormStateBehavior` to add a new `nestedDefaultsPrecedence` option
 - Updated `getDefaultFormState()` to use the new `nestedDefaultsPrecedence` option to control how defaults defined on multiple levels are merged together, fixing [#5089](https://github.com/rjsf-team/react-jsonschema-form/issues/5089)
 - Updated `omitExtraData()` to better handle `allOf`s containing multiple `if/then/else` blocks, matching fix in `SJSF`, fixing [#5142](https://github.com/rjsf-team/react-jsonschema-form/issues/5142)
+- Fixed `optionsList()` to preserve an explicitly empty string `title` on `oneOf`/`anyOf` options instead of falling back to the option's value, fixing [#4448](https://github.com/rjsf-team/react-jsonschema-form/issues/4448)
 
 ## @rjsf/validator-ajv8
 

packages/utils/src/optionsList.ts

@@ -87,10 +87,11 @@ export default function optionsList<T = any, S extends StrictRJSFSchema = RJSFSc
     if (selectorField) {
       const innerSchema: S = get(aSchema, [PROPERTIES_KEY, selectorField], {}) as S;
       value = get(innerSchema, DEFAULT_KEY, get(innerSchema, CONST_KEY));
-      label = label || innerSchema?.title || aSchema.title || String(value);
+      // Use nullish coalescing so that an explicitly empty string title is preserved
+      label = label ?? innerSchema?.title ?? aSchema.title ?? String(value);
     } else {
       value = toConstant(aSchema);
-      label = label || aSchema.title || String(value);
+      label = label ?? aSchema.title ?? String(value);
     }
     return {
       schema: aSchema,

packages/utils/test/optionsList.test.ts

@@ -242,6 +242,44 @@ describe('optionsList()', () => {
         })),
       );
     });
+    it('should keep an empty string title for a oneOf option instead of falling back to the value', () => {
+      const oneOfSchema: RJSFSchema = {
+        type: 'string',
+        oneOf: [
+          {
+            const: 'empty',
+            title: '',
+          },
+          {
+            const: 'active',
+          },
+        ],
+      };
+      expect(optionsList(oneOfSchema)).toEqual([
+        { schema: oneOfSchema.oneOf![0], label: '', value: 'empty' },
+        { schema: oneOfSchema.oneOf![1], label: 'active', value: 'active' },
+      ]);
+    });
+    it('should keep an empty string title for a discriminator option instead of falling back to the value', () => {
+      const anyOfSchema: RJSFSchema = {
+        discriminator: {
+          propertyName: 'animal',
+        },
+        anyOf: [
+          {
+            type: 'object',
+            title: '',
+            properties: {
+              animal: {
+                type: 'string',
+                const: 'dog',
+              },
+            },
+          },
+        ],
+      };
+      expect(optionsList(anyOfSchema)).toEqual([{ schema: anyOfSchema.anyOf![0], label: '', value: 'dog' }]);
+    });
     it('should generate options for an anyOf object schema with a discriminator, titles in object', () => {
       const anyOfSchema: RJSFSchema = {
         title: 'string',