Add support for uniqueItems in convertAction

Author: nix6839

packages/to-json-schema/src/convertAction.test.ts

@@ -490,4 +490,55 @@ describe('convertAction', () => {
       'The "transform" action cannot be converted to JSON Schema.'
     );
   });
+
+  test('should convert unique items action for array', () => {
+    expect(
+      convertAction(
+        {
+          type: 'array',
+        },
+        v.uniqueItems<v.ArrayInput>(),
+        undefined
+      )
+    ).toStrictEqual({
+      type: 'array',
+      uniqueItems: true,
+    });
+  });
+
+  test('should throw error for unique items action with invalid type', () => {
+    expect(() =>
+      convertAction({}, v.uniqueItems<v.ArrayInput>(), undefined)
+    ).toThrowError(
+      'The "unique_items" action is not supported on type "undefined".'
+    );
+    expect(() =>
+      convertAction(
+        { type: 'string' },
+        v.uniqueItems<v.ArrayInput>(),
+        undefined
+      )
+    ).toThrowError(
+      'The "unique_items" action is not supported on type "string".'
+    );
+  });
+
+  test('should force conversion for unique items action with invalid type', () => {
+    expect(
+      convertAction({}, v.uniqueItems<v.ArrayInput>(), { force: true })
+    ).toStrictEqual({
+      uniqueItems: true,
+    });
+    expect(console.warn).toHaveBeenLastCalledWith(
+      'The "unique_items" action is not supported on type "undefined".'
+    );
+    expect(
+      convertAction({ type: 'string' }, v.uniqueItems<v.ArrayInput>(), {
+        force: true,
+      })
+    ).toStrictEqual({ type: 'string', uniqueItems: true });
+    expect(console.warn).toHaveBeenLastCalledWith(
+      'The "unique_items" action is not supported on type "string".'
+    );
+  });
 });

packages/to-json-schema/src/convertAction.ts

@@ -56,7 +56,11 @@ type Action =
       number,
       v.ErrorMessage<v.MultipleOfIssue<number, number>> | undefined
     >
-  | v.TitleAction<unknown, string>;
+  | v.TitleAction<unknown, string>
+  | v.UniqueItemsAction<
+      v.ArrayInput,
+      v.ErrorMessage<v.UniqueItemsIssue<v.ArrayInput>> | undefined
+    >;
 
 /**
  * Converts any supported Valibot action to the JSON Schema format.
@@ -191,6 +195,18 @@ export function convertAction(
       break;
     }
 
+    case 'unique_items': {
+      if (jsonSchema.type !== 'array') {
+        throwOrWarn(
+          `The "${valibotAction.type}" action is not supported on type "${jsonSchema.type}".`,
+          config
+        );
+      }
+      jsonSchema.uniqueItems = true;
+
+      break;
+    }
+
     default: {
       throwOrWarn(
         // @ts-expect-error