fix(js-client): Remove union with undefined of methods for getting random peer (#417)

Fix types

Author: Akim

packages/core/js-client/src/network.ts

@@ -165,21 +165,23 @@ export const kras: Relay[] = [
   },
 ];
 
-export const randomKras = () => {
+export const randomKras = (): Relay => {
   return randomItem(kras);
 };
 
-export const randomTestNet = () => {
+export const randomTestNet = (): Relay => {
   return randomItem(testNet);
 };
 
-export const randomStage = () => {
+export const randomStage = (): Relay => {
   return randomItem(stage);
 };
 
-function randomItem(arr: Relay[]) {
+function randomItem(arr: Relay[]): Relay {
   const index = randomInt(0, arr.length);
-  return arr[index];
+  // This array access always defined
+  // eslint-disable-next-line @typescript-eslint/consistent-type-assertions
+  return arr[index] as Relay;
 }
 
 function randomInt(min: number, max: number) {