feat(zod-mock): add support for readonly fields

packages/zod-mock/src/lib/zod-mock.spec.ts

@@ -32,6 +32,7 @@ describe('zod-mock', () => {
         z.object({ discriminator: z.literal('a'), a: z.boolean() }),
         z.object({ discriminator: z.literal('b'), b: z.string() }),
       ]),
+      readonly: z.boolean().readonly(),
     });
 
     const mockData = generateMock(schema);
@@ -58,6 +59,7 @@ describe('zod-mock', () => {
     expect(mockData.set).toBeTruthy();
     expect(mockData.map).toBeTruthy();
     expect(mockData.discriminatedUnion).toBeTruthy();
+    expect(typeof mockData.readonly).toEqual('boolean');
   });
 
   it('should generate mock data of the appropriate type when the field names overlap Faker properties that are not valid functions', () => {

packages/zod-mock/src/lib/zod-mock.ts

@@ -536,6 +536,13 @@ function parseLazy(
   return generateMock(zodRef._def.getter(), options);
 }
 
+function parseReadonly(
+  zodRef: z.ZodReadonly<ZodTypeAny>,
+  options?: GenerateMockOptions
+) {
+  return generateMock(zodRef._def.innerType, options);
+}
+
 const workerMap = {
   ZodObject: parseObject,
   ZodRecord: parseRecord,
@@ -565,6 +572,7 @@ const workerMap = {
   ZodBranded: parseBranded,
   ZodNull: () => null,
   ZodNaN: () => NaN,
+  ZodReadonly: parseReadonly,
 };
 
 type WorkerKeys = keyof typeof workerMap;