Use TypeScript interface for websocket calllback

src/api.js

@@ -1,12 +1,6 @@
 import { log, logLevels } from "@/logging";
 import { getApiUrl } from "@/util";
 
-/**
- * Callback for new WebSocket location messages.
- *
- * @callback webSocketLocationCallback
- */
-
 /**
  * Fetch an API resource.
  *
@@ -145,7 +139,7 @@ export const getLocationHistory = async (devices, start, end) => {
  * Connect to the WebSocket API, reconnect when necessary and handle received
  * messages.
  *
- * @param {webSocketLocationCallback} [callback] Callback for location messages
+ * @param {WebSocketLocationCallback} [callback] Callback for location messages
  */
 export const connectWebsocket = async callback => {
   let url = getApiUrl("/ws/last");

src/index.d.ts

@@ -201,6 +201,9 @@ interface QueryParams {
     layers?: string;
 }
 
+/** Callback for new WebSocket location messages. */
+interface WebSocketLocationCallback { (): void }
+
 /** A CSS color. */
 type Color = string;