fix: circular ref json serialization (#29)

* feat: implement safeStringify to handle circular references in JSON serialization

* update and test

* test update

* chore: add ref

* chore: lint

* chore: fix types

* fix: tests

* remove only modifier

* chore: fix types

---------

Co-authored-by: Rikhi Singh <114336052+RikhiSingh@users.noreply.github.com>
Co-authored-by: Bereket Engida <86073083+Bekacru@users.noreply.github.com>
Co-authored-by: Bereket Engida <Bekacru@gmail.com>

Author: 3 people

package.json

@@ -34,7 +34,7 @@
     "typescript": "^5.6.0-beta",
     "valibot": "1.0.0-beta.15",
     "vitest": "^3.1.1",
-    "zod": "^3.24.1"
+    "zod": "^4.0.1"
   },
   "dependencies": {
     "@better-fetch/fetch": "^1.1.4",

pnpm-lock.yaml

@@ -143,7 +143,7 @@ describe("types", async () => {
 			"/path",
 			{
 				method: "POST",
-				body: z.record(z.string()),
+				body: z.record(z.string(), z.string()),
 				metadata: {
 					$Infer: {
 						body: {} as {
@@ -206,7 +206,7 @@ describe("types", async () => {
 			"/path",
 			{
 				method: "POST",
-				body: z.record(z.string()),
+				body: z.record(z.string(), z.string()),
 				metadata: {
 					$Infer: {
 						query: {} as {

src/endpoint.test.ts

@@ -1,4 +1,4 @@
-import { ZodObject, ZodOptional, ZodSchema } from "zod";
+import { ZodObject, ZodOptional, ZodType } from "zod";
 import type { Endpoint, EndpointOptions } from "./endpoint";
 
 export type OpenAPISchemaType = "string" | "number" | "integer" | "boolean" | "array" | "object";
@@ -82,7 +82,7 @@ export interface Path {
 }
 const paths: Record<string, Path> = {};
 
-function getTypeFromZodType(zodType: ZodSchema) {
+function getTypeFromZodType(zodType: ZodType<any>) {
 	switch (zodType.constructor.name) {
 		case "ZodString":
 			return "string";
@@ -107,7 +107,7 @@ function getParameters(options: EndpointOptions) {
 	}
 	if (options.query instanceof ZodObject) {
 		Object.entries(options.query.shape).forEach(([key, value]) => {
-			if (value instanceof ZodSchema) {
+			if (value instanceof ZodObject) {
 				parameters.push({
 					name: key,
 					in: "query",
@@ -139,7 +139,7 @@ function getRequestBody(options: EndpointOptions): any {
 		const properties: Record<string, any> = {};
 		const required: string[] = [];
 		Object.entries(shape).forEach(([key, value]) => {
-			if (value instanceof ZodSchema) {
+			if (value instanceof ZodObject) {
 				properties[key] = {
 					type: getTypeFromZodType(value),
 					description: value.description,