Setup eslint and enforce rules

src/util/support/timeout.ts

@@ -31,10 +31,10 @@ export interface TimeoutSubscriber<T> {
  * @param {number} timeout - timeout in milliseconds
  * @param {Promise} promise - the promise to subscribe to
  */
-export function withTimeout<T>(timeout: number, promise: Promise<T>) {
-    let onTimeHandler: (arg: T) => any = (arg) => {}
-    let lateHandler: (arg: T) => any = (arg) => {}
-    let timeoutHandler: () => any = () => {}
+export function withTimeout<T>(timeout: number, promise: Promise<T>): TimeoutSubscriber<T> {
+    let onTimeHandler: (arg: T) => any = () => {}  // eslint-disable-line @typescript-eslint/no-empty-function
+    let lateHandler: (arg: T) => any = () => {}  // eslint-disable-line @typescript-eslint/no-empty-function
+    let timeoutHandler: () => any = () => {}  // eslint-disable-line @typescript-eslint/no-empty-function
 
     const sub = {
         onTime: handler => {
@@ -54,7 +54,9 @@ export function withTimeout<T>(timeout: number, promise: Promise<T>) {
             let resolved = false
             setTimeout(() => {
                 expired = true
-                if ( !resolved ) timeoutHandler()
+                if ( !resolved ) {
+                    timeoutHandler()
+                }
             }, timeout)
 
             const result: T = await promise
@@ -67,7 +69,7 @@ export function withTimeout<T>(timeout: number, promise: Promise<T>) {
             }
 
             return result
-        }
+        },
     } as TimeoutSubscriber<T>
 
     return sub