Migrate service-config module to TS

src/sidebar/config/build-settings.ts

@@ -13,7 +13,7 @@ import { hostPageConfig } from './host-config';
 /**
  * Ascend `levels` from `window_` to find the designated embedder frame.
  *
- * @param levels - Number of ancestors levels to ascend
+ * @param levels - Number of ancestor levels to ascend
  */
 function getEmbedderFrame(levels: number, window_: Window = window): Window {
   let ancestorWindow = window_;

src/sidebar/config/service-config.js → src/sidebar/config/service-config.ts

-/**
- * @typedef {import('../../types/config').SidebarSettings} SidebarSettings
- * @typedef {import('../../types/config').Service} Service
- */
+import type { SidebarSettings, Service } from '../../types/config';
 
 /**
  * Return the configuration for the annotation service which the client would retrieve
  * annotations from which may contain the authority, grantToken and icon.
- *
- * @param {SidebarSettings} settings
- * @return {Service|null}
  */
 
-export function serviceConfig({ services }) {
+export function serviceConfig({ services }: SidebarSettings): Service | null {
   if (Array.isArray(services) && services[0]) {
     return services[0];
   }