diff --git a/src/setup.ts b/src/setup.ts
new file mode 100644
index 0000000..8ba27a9
--- /dev/null
+++ b/src/setup.ts
@@ -0,0 +1,113 @@
+import { type Node } from "@babel/types";
+
+export const setupNodes: Node[] = [
+  {
+    type: "ExpressionStatement",
+    expression: {
+      type: "AssignmentExpression",
+      operator: "=",
+      left: {
+        type: "MemberExpression",
+        object: {
+          type: "Identifier",
+          name: "globalThis",
+        },
+        computed: false,
+        property: {
+          type: "Identifier",
+          name: "XMLHttpRequest",
+        },
+      },
+      right: {
+        type: "ObjectExpression",
+        properties: [
+          {
+            type: "ObjectProperty",
+            method: false,
+            key: {
+              type: "Identifier",
+              name: "prototype",
+            },
+            computed: false,
+            shorthand: false,
+            value: {
+              type: "ObjectExpression",
+              properties: [],
+            },
+          },
+        ],
+      },
+    },
+  },
+  {
+    type: "VariableDeclaration",
+    declarations: [
+      {
+        type: "VariableDeclarator",
+        id: {
+          type: "Identifier",
+          name: "window",
+        },
+        init: {
+          type: "CallExpression",
+          callee: {
+            type: "MemberExpression",
+            object: {
+              type: "Identifier",
+              name: "Object",
+            },
+            computed: false,
+            property: {
+              type: "Identifier",
+              name: "assign",
+            },
+          },
+          arguments: [
+            {
+              type: "CallExpression",
+              callee: {
+                type: "MemberExpression",
+                object: {
+                  type: "Identifier",
+                  name: "Object",
+                },
+                computed: false,
+                property: {
+                  type: "Identifier",
+                  name: "create",
+                },
+              },
+              arguments: [
+                {
+                  type: "NullLiteral",
+                },
+              ],
+            },
+            {
+              type: "Identifier",
+              name: "globalThis",
+            },
+          ],
+        },
+      },
+    ],
+    kind: "const",
+  },
+  {
+    type: "VariableDeclaration",
+    declarations: [
+      {
+        type: "VariableDeclarator",
+        id: {
+          type: "Identifier",
+          name: "document",
+        },
+        init: {
+          type: "ObjectExpression",
+          properties: [],
+        },
+      },
+    ],
+    kind: "const",
+  },
+];
diff --git a/src/solvers.ts b/src/solvers.ts
index 65867ef..3410ab3 100755
--- a/src/solvers.ts
+++ b/src/solvers.ts
@@ -4,15 +4,7 @@ import { type ArrowFunctionExpression } from "@babel/types";
 import { getFunctionNodes } from "./utils.ts";
 import { extract as extractSig } from "./sig.ts";
 import { extract as extractNsig } from "./nsig.ts";
-
-function setup() {
-  // @ts-ignore: This is used in the babel generated js
-  globalThis.XMLHttpRequest = { prototype: {} };
-  // deno-lint-ignore no-unused-vars
-  const window = Object.assign(Object.create(null), globalThis);
-  // deno-lint-ignore no-unused-vars
-  const document = {};
-}
+import { setupNodes } from "./setup.ts";
 
 export function preprocessPlayer(data: string): string {
   const ast = parse(data, {
@@ -109,7 +101,7 @@ export function preprocessPlayer(data: string): string {
     });
   }
 
-  ast.program.body.splice(0, 0, ...getFunctionNodes(setup));
+  ast.program.body.splice(0, 0, ...setupNodes);
 
   const { code } = generate(ast, {
     comments: false,