Allow unused vars in args and fix more eslint issues

extra/beta/update-version.js

@@ -5,7 +5,6 @@ const util = require("../../src/util");
 
 util.polyfill();
 
-const oldVersion = pkg.version;
 const version = process.env.VERSION;
 
 console.log("Beta Version: " + version);
@@ -61,11 +60,3 @@ function tagExists(version) {
 
     return res.stdout.toString().trim() === version;
 }
-
-function safeDelete(dir) {
-    if (fs.existsSync(dir)) {
-        fs.rmdirSync(dir, {
-            recursive: true,
-        });
-    }
-}