TypeScript update to 6.0.3 (#3806)

## Description:

Updating TypeScript to 6.0.3.
Updating TypeScript-eslint to 8.59.1 for TS6 support.
Concurrently needed to get updated as well to remove deprecated warning.

Most things deleted are now just defaults.

## Please complete the following:

- [X] I have added screenshots for all UI updates
- [X] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [X] I have added relevant tests to the test directory
- [X] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

Babyboucher

src/core/game/GameImpl.ts

@@ -40,6 +40,7 @@ import {
 } from "./Game";
 import { GameMap, TileRef } from "./GameMap";
 import { GameUpdate, GameUpdateType } from "./GameUpdates";
+import { UnitView } from "./GameView";
 import { MotionPlanRecord, packMotionPlans } from "./MotionPlans";
 import { PlayerImpl } from "./PlayerImpl";
 import { RailNetwork } from "./RailNetwork";
@@ -1002,7 +1003,7 @@ export class GameImpl implements Game {
       tile,
       searchRange,
       types,
-      predicate,
+      predicate as (unit: Unit | UnitView) => boolean,
       playerId,
       includeUnderConstruction,
     );

src/core/game/GameView.ts

@@ -25,6 +25,7 @@ import {
   Tick,
   TrainType,
   TransportShipState,
+  Unit,
   UnitInfo,
   UnitType,
   WarshipState,
@@ -1151,7 +1152,7 @@ export class GameView implements GameMap {
       tile,
       searchRange,
       types,
-      predicate,
+      predicate as (unit: Unit | UnitView) => boolean,
       playerId,
       includeUnderConstruction,
     );

src/core/game/RailNetworkImpl.ts

@@ -113,7 +113,8 @@ export class RailNetworkImpl implements RailNetwork {
     for (const cluster of this.dirtyClusters) {
       const allOriginalStations = new Set(cluster.stations);
       while (allOriginalStations.size > 0) {
-        const nextStation = allOriginalStations.values().next().value;
+        const nextStation = allOriginalStations.values().next()
+          .value as TrainStation;
         const allConnectedStations = this.computeCluster(nextStation);
         // Filter stations that are connected to the current cluster
         for (const connectedStation of allConnectedStations) {

src/core/game/Stats.ts

@@ -106,5 +106,5 @@ export interface Stats {
   trainSelfTrade(player: Player, gold: number | bigint): void;
 
   // Another player's train arrives at own station
-  trainExternalTrade(player: Player, goldPlayer: number | bigint);
+  trainExternalTrade(player: Player, goldPlayer: number | bigint): void;
 }

src/core/utilities/DebugSpan.ts

@@ -9,6 +9,11 @@ type Span = {
 
 const stack: Span[] = [];
 
+declare global {
+  var __DEBUG_SPAN_ENABLED__: boolean | undefined;
+  var __DEBUG_SPANS__: Span[];
+}
+
 function isEnabled(): boolean {
   return globalThis.__DEBUG_SPAN_ENABLED__ === true;
 }
@@ -82,7 +87,10 @@ export const DebugSpan = {
       );
     };
 
-    const properties = {
+    const properties: {
+      timings: Record<string, number | undefined>;
+      data: Record<string, any>;
+    } = {
       timings: { total: span.duration },
       data: extractData(span),
     };