diff --git a/.gitignore b/.gitignore
index 68942c6b..22c2bb2b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,7 @@ commit.patch
 commit.template
 .wireit
 target/
+*.tsbuildinfo
 
 # todo: we should figure out a good way to sync these with the internal repo instead of having to generate them with the init script
 Cargo.lock
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 6d845b8c..b587be8f 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -13,6 +13,11 @@
       "changeProcessCWD": true
     }
   ],
+  "[javascript]": {
+    "editor.defaultFormatter": "vscode.typescript-language-features",
+    "editor.insertSpaces": false,
+    "editor.formatOnSave": true
+  },
   "[typescript]": {
     "editor.defaultFormatter": "vscode.typescript-language-features",
     "editor.insertSpaces": false,
diff --git a/priompt-preview/scripts/serve.cjs b/priompt-preview/scripts/serve.cjs
index f39ba51b..b52fc42d 100755
--- a/priompt-preview/scripts/serve.cjs
+++ b/priompt-preview/scripts/serve.cjs
@@ -61,7 +61,7 @@ const requestListener = (req, res) => {
 				data = data.toString().replace(/PRIOMPT_PREVIEW_OPENAI_KEY/g, `${process.env.PRIOMPT_PREVIEW_OPENAI_KEY}`);
 			}
 			if ((extname === '.html' || extname === '.js') && data.toString().includes('PRIOMPT_PREVIEW_OSS_ENDPOINTS_JSON_STRING')) {
-				data = data.toString().replace(/PRIOMPT_PREVIEW_OSS_ENDPOINTS_JSON_STRING/g, `${process.env.PRIOMPT_PREVIEW_OSS_ENDPOINTS_JSON_STRING}`);
+				data = data.toString().replace(/PRIOMPT_PREVIEW_OSS_ENDPOINTS_JSON_STRING/g, `${process.env.PRIOMPT_PREVIEW_OSS_ENDPOINTS_JSON_STRING ?? "PRIOMPT_PREVIEW_OSS_ENDPOINTS_JSON_STRING"}`);
 			}
 			res.end(data);
 		}