diff --git a/dev/build_index.mjs b/dev/build_index.mjs
index 96fc2cd08..50a440fef 100644
--- a/dev/build_index.mjs
+++ b/dev/build_index.mjs
@@ -1,28 +1,30 @@
-import fs from "node:fs/promises";
+import fs from "node:fs";
 import path from "node:path";
 
-(async () => {
-	const extensionFiles = await fs.readdir("Extensions");
-	const extensionIds = extensionFiles
-		.filter(fileName => fileName.endsWith(".js") && !fileName.endsWith(".icon.js"))
-		.map(fileName => path.parse(fileName).name);
+const extensionFiles = fs.readdirSync("Extensions");
+const extensionIds = extensionFiles
+	.filter(fileName => fileName.endsWith(".js") && !fileName.endsWith(".icon.js"))
+	.map(fileName => path.parse(fileName).name);
 
-	const extensionList = {};
-	extensionIds.forEach(id => {
-		extensionList[id] = {
-			icon: extensionFiles.includes(`${id}.icon.js`),
-			css: extensionFiles.includes(`${id}.css`),
-		};
-	});
+const extensionList = {};
+extensionIds.forEach(id => {
+	extensionList[id] = {
+		icon: extensionFiles.includes(`${id}.icon.js`),
+		css: extensionFiles.includes(`${id}.css`),
+	};
+});
 
-	await fs.writeFile("Extensions/_index.json", JSON.stringify(extensionList, null, 2), {
-		encoding: "utf8",
-		flag: "w+",
-	});
+fs.writeFileSync(
+	"Extensions/_index.json",
+	JSON.stringify(extensionList, null, 2),
+	{ encoding: "utf8", flag: "w+", }
+);
 
-	const themeList = (await fs.readdir("Themes")).filter(name => name.startsWith("_") === false);
-	await fs.writeFile("Themes/_index.json", JSON.stringify(themeList, null, 2), {
-		encoding: "utf8",
-		flag: "w+",
-	});
-})();
+const themeList = fs.readdirSync("Themes")
+  .filter(name => name.startsWith("_") === false);
+
+fs.writeFileSync(
+	"Themes/_index.json",
+	JSON.stringify(themeList, null, 2),
+	{ encoding: "utf8", flag: "w+", }
+);