core&ui: enhanced template hot reload

packages/hydrooj/src/commands/addon.ts

@@ -18,7 +18,7 @@ export function register(cli: CAC) {
         let addons = JSON.parse(fs.readFileSync(addonPath).toString());
         if (operation === 'create') {
             const dir = `${addonDir}/${name || 'addon'}`;
-            fs.mkdirSync(dir);
+            fs.mkdirSync(dir, { recursive: true });
             child.execSync('yarn init -y', { cwd: dir });
             fs.mkdirSync(`${dir}/templates`);
             fs.mkdirSync(`${dir}/locales`);