Revert "removed fs test for plugin.main, use try/catch instead"

This reverts commit 1ff70a5.

Author: alMukaafih

src/lib/loadPlugin.js

@@ -12,16 +12,27 @@ export default async function loadPlugin(pluginId, justInstalled = false) {
 		Url.join(PLUGIN_DIR, pluginId, "plugin.json"),
 	).readFile("json");
 
+	let mainUrl;
+	if (
+		await fsOperation(Url.join(PLUGIN_DIR, pluginId, pluginJson.main)).exists()
+	) {
+		mainUrl = Url.join(baseUrl, pluginJson.main);
+	} else {
+		mainUrl = Url.join(baseUrl, "main.js");
+	}
+
 	return new Promise((resolve, reject) => {
-		const onerror = (error) => {
+		const $script = <script src={mainUrl}></script>;
+
+		$script.onerror = (error) => {
 			reject(
 				new Error(
 					`Failed to load script for plugin ${pluginId}: ${error.message || error}`,
 				),
 			);
 		};
 
-		const onload = async () => {
+		$script.onload = async () => {
 			const $page = Page("Plugin");
 			$page.show = () => {
 				actionStack.push({
@@ -53,17 +64,6 @@ export default async function loadPlugin(pluginId, justInstalled = false) {
 			}
 		};
 
-		const $script = <script src={Url.join(baseUrl, pluginJson.main)}></script>;
-		$script.onload = onload;
-		$script.onerror = onerror;
-
-		try {
-			document.head.append($script);
-		} catch (_) {
-			const $script = <script src={Url.join(baseUrl, "main.js")}></script>;
-			$script.onload = onload;
-			$script.onerror = onerror;
-			document.head.append($script);
-		}
+		document.head.append($script);
 	});
 }