diff --git a/src/shared/rewriters/js.ts b/src/shared/rewriters/js.ts
index aa1eeb3..dcd58fa 100644
--- a/src/shared/rewriters/js.ts
+++ b/src/shared/rewriters/js.ts
@@ -23,10 +23,36 @@ initSync(new WebAssembly.Module(
 	Uint8Array.from(atob(self.WASM), c => c.charCodeAt(0))
 ))
 
-export function rewriteJs(js: string) {
-	const f = rewrite_js(js);
+export function rewriteJs(js: string | ArrayBuffer) {
+	let rewrites;
 
-	return f
+	let before = performance.now();
+	if (typeof js === "string") {
+		rewrites = rewrite_js(js);
+	} else {
+		js = new TextDecoder().decode(js);
+		rewrites = rewrite_js(js);
+	}
+	let after = performance.now();
+
+	console.log("Rewrite took", Math.floor((after - before) * 10) / 10, "ms");
+
+	let offset = 0;
+
+	for (const rewrite of rewrites) {
+		if (rewrite.genericchange) {
+			let change = rewrite.genericchange;
+			let start = change.span.start + offset;
+			let end = change.span.end + offset;
+			let len = end - start;
+
+			js = js.slice(0, start) + change.text + js.slice(end);
+
+			offset += change.text.length - len;
+		}
+	}
+
+	return js;
 
 	// console.log(f)
 	//