From 3cd17070aba4d0f18d6b7b8ce76c76dbb3e05b01 Mon Sep 17 00:00:00 2001
From: Percs <83934299+Percslol@users.noreply.github.com>
Date: Sat, 15 Mar 2025 00:50:57 -0500
Subject: [PATCH] fix strict mode sourcemap handling

---
 src/worker/fetch.ts | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/worker/fetch.ts b/src/worker/fetch.ts
index 60e80cb..e0e568c 100644
--- a/src/worker/fetch.ts
+++ b/src/worker/fetch.ts
@@ -366,9 +366,16 @@ async function rewriteBody(
 				workertype === "module"
 			);
 			if (flagEnabled("sourcemaps", meta.base) && map) {
-				js =
-					`${globalThis.$scramjet.config.globals.pushsourcemapfn}([${map.join(",")}], "${tag}");` +
-					(js instanceof Uint8Array ? new TextDecoder().decode(js) : js);
+				if (js instanceof Uint8Array) {
+					js = new TextDecoder().decode(js);
+				}
+				const sourcemapfn = `${globalThis.$scramjet.config.globals.pushsourcemapfn}([${map.join(",")}], "${tag}");`;
+				const strictMode = /^\s*(['"])use strict\1;?/;
+				if (strictMode.test(js)) {
+					js = js.replace(strictMode, `$&\n${sourcemapfn}`);
+				} else {
+					js = `${sourcemapfn}\n${js}`;
+				}
 			}
 
 			return js as unknown as ArrayBuffer;