removed async from synchronous functions

src/serve_style.js

@@ -12,7 +12,6 @@ import {
   allowedSpriteFormats,
   fixUrl,
   readFile,
-  isValidHttpUrl,
 } from './utils.js';
 
 const httpTester = /^https?:\/\//i;
@@ -200,9 +199,9 @@ export const serve_style = {
    * @param {object} style pre-fetched/read StyleJSON object.
    * @param {Function} reportTiles Function for reporting tile sources.
    * @param {Function} reportFont Function for reporting font usage
-   * @returns {Promise<boolean>} true if add is successful
+   * @returns {boolean} true if add is successful
    */
-  add: async function (
+  add: function (
     options,
     repo,
     params,

src/server.js

@@ -202,7 +202,7 @@ async function start(opts) {
     }
 
     if (item.serve_data !== false) {
-      success = await serve_style.add(
+      success = serve_style.add(
         options,
         serving.styles,
         item,