diff --git a/src/client/shared/eval.ts b/src/client/shared/eval.ts
new file mode 100644
index 0000000..742b02f
--- /dev/null
+++ b/src/client/shared/eval.ts
@@ -0,0 +1,28 @@
+import { rewriteJs } from "../../shared/rewriters/js";
+import { ScramjetClient } from "../client";
+import { config } from "../shared";
+
+export default function (client: ScramjetClient, self: Self) {
+	// used for proxying *direct eval*
+	// eval("...") -> eval($scramjet$rewrite("..."))
+	Object.defineProperty(self, config.rewritefn, {
+		value: function (js: any) {
+			if (typeof js !== "string") return js;
+
+			const rewritten = rewriteJs(js, client.url);
+
+			return rewritten;
+		},
+		writable: false,
+		configurable: false,
+	});
+}
+
+export function indirectEval(this: ScramjetClient, js: any) {
+	// > If the argument of eval() is not a string, eval() returns the argument unchanged
+	if (typeof js !== "string") return js;
+
+	const indirection = this.global.eval;
+
+	return indirection(rewriteJs(js, this.url) as string);
+}