diff --git a/playground/examples/HTMLRewriter.E1.FindAllLinks.js b/playground/examples/HTMLRewriter.E1.FindAllLinks.js
index 12e3fef..39581a6 100644
--- a/playground/examples/HTMLRewriter.E1.FindAllLinks.js
+++ b/playground/examples/HTMLRewriter.E1.FindAllLinks.js
@@ -15,11 +15,11 @@ function findInternalLinks(html) {
               }
               
             })
-        }).transform(new Response(html, undefined));
+        }).transform(new Response(html));
   return internalLinks;
 }
 
-var content = await fetch("https://bun.sh", undefined);
+var content = await fetch("https://bun.sh");
 
 var html = await content.text();
 
diff --git a/playground/examples/HTMLRewriter.E2.RewriteDivs.js b/playground/examples/HTMLRewriter.E2.RewriteDivs.js
index 139fcfd..1166727 100644
--- a/playground/examples/HTMLRewriter.E2.RewriteDivs.js
+++ b/playground/examples/HTMLRewriter.E2.RewriteDivs.js
@@ -11,7 +11,7 @@ var rewriter = new HTMLRewriter().on("*", {
         })
     });
 
-var response = await fetch("https://bun.sh", undefined);
+var response = await fetch("https://bun.sh");
 
 var transformedResponse = rewriter.transform(response);
 
diff --git a/playground/examples/HTTP.E1.SimpleServer.js b/playground/examples/HTTP.E1.SimpleServer.js
index 219d440..47cf6d7 100644
--- a/playground/examples/HTTP.E1.SimpleServer.js
+++ b/playground/examples/HTTP.E1.SimpleServer.js
@@ -3,8 +3,16 @@
 
 var server = Bun.serve({
       port: 3000,
-      fetch: (async function (_request, _server) {
-          return new Response("Welcome to Bun!", undefined);
+      fetch: (async function (request, _server) {
+          var url = new URL(request.url);
+          var match = url.pathname;
+          if (match === "/") {
+            return Response.json({
+                        test: 1
+                      });
+          } else {
+            return new Response("404!");
+          }
         })
     });
 
@@ -13,14 +21,14 @@ console.log("Listening on localhost: " + server.port.toString());
 var tlsServer = Bun.serve({
       tls: {
         ca: [
-          Bun.file("ca1.pem", undefined),
-          Bun.file("ca2.pem", undefined)
+          Bun.file("ca1.pem"),
+          Bun.file("ca2.pem")
         ],
-        cert: [Bun.file("cert.pem", undefined)],
-        key: [Bun.file("key.pem", undefined)]
+        cert: [Bun.file("cert.pem")],
+        key: [Bun.file("key.pem")]
       },
       fetch: (async function (_request, _server) {
-          return new Response("Welcome to Bun!", undefined);
+          return new Response("Welcome to Bun!");
         })
     });
 
diff --git a/playground/examples/HTTP.E2.Fetch.js b/playground/examples/HTTP.E2.Fetch.js
index cedad01..ef37571 100644
--- a/playground/examples/HTTP.E2.Fetch.js
+++ b/playground/examples/HTTP.E2.Fetch.js
@@ -2,7 +2,7 @@
 
 import * as Core__Option from "@rescript/core/src/Core__Option.js";
 
-var response = await fetch("https://bun.sh", undefined);
+var response = await fetch("https://bun.sh");
 
 var html = await response.text();
 
diff --git a/playground/examples/HTTP.E3.StreamFile.js b/playground/examples/HTTP.E3.StreamFile.js
index 99355b7..db535da 100644
--- a/playground/examples/HTTP.E3.StreamFile.js
+++ b/playground/examples/HTTP.E3.StreamFile.js
@@ -5,7 +5,7 @@ import * as Caml_option from "rescript/lib/es6/caml_option.js";
 
 var path = Nodepath.resolve(import.meta.dir, "test.txt");
 
-var file = Bun.file(path, undefined);
+var file = Bun.file(path);
 
 var resp = new Response(file);
 
@@ -13,7 +13,7 @@ console.log(Caml_option.nullable_to_opt(resp.headers.get("Content-Type")));
 
 var _server = Bun.serve({
       fetch: (async function (req, _server) {
-          return new Response(Bun.file(new URL(req.url).pathname, undefined));
+          return new Response(Bun.file(new URL(req.url).pathname));
         })
     });
 
diff --git a/playground/examples/HTTP.E4.FileUploads.js b/playground/examples/HTTP.E4.FileUploads.js
index fb53b55..c8470b7 100644
--- a/playground/examples/HTTP.E4.FileUploads.js
+++ b/playground/examples/HTTP.E4.FileUploads.js
@@ -9,7 +9,7 @@ var server = Bun.serve({
           var match = url.pathname;
           switch (match) {
             case "/" :
-                return new Response(Bun.file("index.html", undefined));
+                return new Response(Bun.file("index.html"));
             case "/action" :
                 var formData = await req.formData();
                 formData.get("name");
@@ -20,8 +20,8 @@ var server = Bun.serve({
                 if (typeof profilePicture === "string") {
                   return RescriptCore.panic("Must upload a profile picture");
                 }
-                await Bun.write("profilePicture.png", Bun.file(profilePicture, undefined));
-                return new Response("Success", undefined);
+                await Bun.write("profilePicture.png", Bun.file(profilePicture));
+                return new Response("Success");
             default:
               return new Response("Not Found", {
                           status: 404
diff --git a/playground/examples/Utils.E1.HashPassword.js b/playground/examples/Utils.E1.HashPassword.js
index 8e36b35..816639d 100644
--- a/playground/examples/Utils.E1.HashPassword.js
+++ b/playground/examples/Utils.E1.HashPassword.js
@@ -3,7 +3,7 @@
 
 var password = "super-secure-pa$$word";
 
-var hash = await Bun.password.hash(password, undefined);
+var hash = await Bun.password.hash(password);
 
 console.log(hash);
 
@@ -22,7 +22,7 @@ var bcryptHash = await Bun.password.hash(password, {
 
 console.log(bcryptHash);
 
-var isMatch = await Bun.password.verify(password, hash, undefined);
+var isMatch = await Bun.password.verify(password, hash);
 
 console.log(isMatch);
 
diff --git a/playground/examples/Utils.E5.DeepEquals.js b/playground/examples/Utils.E5.DeepEquals.js
index e733f49..36a6a6a 100644
--- a/playground/examples/Utils.E5.DeepEquals.js
+++ b/playground/examples/Utils.E5.DeepEquals.js
@@ -17,7 +17,7 @@ var b = {
   }
 };
 
-var equals = Bun.deepEquals(a, b, undefined);
+var equals = Bun.deepEquals(a, b);
 
 console.log(equals);
 
diff --git a/playground/package-lock.json b/playground/package-lock.json
index d064bb5..50ecdc8 100644
--- a/playground/package-lock.json
+++ b/playground/package-lock.json
@@ -9,21 +9,21 @@
       "version": "0.1.0",
       "license": "ISC",
       "dependencies": {
-        "@rescript/core": "1.0.0",
-        "rescript": "11.1.0-rc.2",
+        "@rescript/core": "1.3.0",
+        "rescript": "11.1.1",
         "rescript-bun": "../"
       }
     },
     "..": {
-      "version": "0.3.1",
+      "version": "0.5.0",
       "license": "MIT",
       "devDependencies": {
-        "@rescript/core": "1.0.0",
-        "rescript": "11.1.0-rc.2"
+        "@rescript/core": "1.3.0",
+        "rescript": "11.1.1"
       },
       "peerDependencies": {
-        "@rescript/core": ">=1.0.0",
-        "rescript": ">=11.0.0 || ^11.1.0-rc.2"
+        "@rescript/core": ">=1.3.0",
+        "rescript": ">=11.1.0"
       }
     },
     "../node_modules/@rescript/core": {
@@ -49,16 +49,18 @@
       }
     },
     "node_modules/@rescript/core": {
-      "version": "1.0.0",
-      "license": "MIT",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/@rescript/core/-/core-1.3.0.tgz",
+      "integrity": "sha512-wNZOZ63sYcaIYZCmTZeIPCeLa3HCGgPbIOR8zjyNkoBYUlxNV8Nb2ZyqlXR5Mb9ttvv8fTV56JbKhyVEZEYo8g==",
       "peerDependencies": {
-        "rescript": ">=11.0.0 || ^11.1.0-rc.2"
+        "rescript": "^11.1.0-rc.7"
       }
     },
     "node_modules/rescript": {
-      "version": "11.1.0-rc.2",
+      "version": "11.1.1",
+      "resolved": "https://registry.npmjs.org/rescript/-/rescript-11.1.1.tgz",
+      "integrity": "sha512-FMELeoiR1n3LzBdBt+k7U4l0vsz5Xh0HBSHf+0NhyhzZkMRLkEKEDNrcqZc6RIux9bxmxoO+zEa9qFM01VOXAw==",
       "hasInstallScript": true,
-      "license": "SEE LICENSE IN LICENSE",
       "bin": {
         "bsc": "bsc",
         "bstracing": "lib/bstracing",
diff --git a/playground/package.json b/playground/package.json
index b863bee..e6ed3e9 100644
--- a/playground/package.json
+++ b/playground/package.json
@@ -11,8 +11,8 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "@rescript/core": "1.0.0",
-    "rescript": "11.1.0-rc.2",
+    "@rescript/core": "1.3.0",
+    "rescript": "11.1.1",
     "rescript-bun": "../"
   }
 }
diff --git a/playground/rescript.json b/playground/rescript.json
index 1337af6..0cfa3f2 100644
--- a/playground/rescript.json
+++ b/playground/rescript.json
@@ -13,7 +13,7 @@
     }
   ],
   "package-specs": {
-    "module": "es6",
+    "module": "esmodule",
     "in-source": true
   },
   "suffix": ".js",
diff --git a/playground/src/Playground.js b/playground/src/Playground.js
index 90a9d2e..8b89edb 100644
--- a/playground/src/Playground.js
+++ b/playground/src/Playground.js
@@ -9,7 +9,7 @@ rewriter.on("*", {
         })
     });
 
-var transformedResponse = rewriter.transform(new Response("<html><head></head><body><div>hellO!</div></body></html>", undefined));
+var transformedResponse = rewriter.transform(new Response("<html><head></head><body><div>hellO!</div></body></html>"));
 
 var html = await transformedResponse.text();
 
diff --git a/playground/tests/TestingPlayground.test.js b/playground/tests/TestingPlayground.test.js
index 5dd113c..b923f7b 100644
--- a/playground/tests/TestingPlayground.test.js
+++ b/playground/tests/TestingPlayground.test.js
@@ -5,7 +5,7 @@ import * as Buntest from "bun:test";
 Buntest.describe("Playing around with tests", (function () {
         Buntest.test("addition works", (function () {
                 Buntest.expect(2).toBe(2);
-              }), undefined);
+              }));
       }));
 
 export {
diff --git a/test/Shell.test.js b/test/Shell.test.js
deleted file mode 100644
index ef4f7ae..0000000
--- a/test/Shell.test.js
+++ /dev/null
@@ -1,16 +0,0 @@
-// Generated by ReScript, PLEASE EDIT WITH CARE
-
-import * as $$Bun from "bun";
-import * as Buntest from "bun:test";
-
-Buntest.describe("shell", (function () {
-        Buntest.test("basic commands work", (async function () {
-                var res = await $$Bun.$`echo "HELLO"`;
-                Buntest.expect(res.stdout.toString()).toBe("HELLO\n");
-              }));
-      }));
-
-export {
-  
-}
-/*  Not a pure module */