Switch to using import type

We were previously using `type Foo = import('bar').Foo` which works
actually equally well, because sucrase didn't support `import type`,
but now it does!

build

@@ -61,7 +61,7 @@ try {
 	var sucraseVersion = require('sucrase').getVersion().split('.');
 	if (
 		parseInt(sucraseVersion[0]) < 3 ||
-		(parseInt(sucraseVersion[0]) === 3 && parseInt(sucraseVersion[1]) < 12)
+		(parseInt(sucraseVersion[0]) === 3 && parseInt(sucraseVersion[1]) < 15)
 	) {
 		throw new Error("Sucrase version too old");
 	}

package.json

@@ -6,7 +6,7 @@
   "dependencies": {
     "probe-image-size": "^5.0.0",
     "sockjs": "0.3.20",
-    "sucrase": "^3.13.0"
+    "sucrase": "^3.15.0"
   },
   "optionalDependencies": {
     "cloud-env": "^0.2.3",
@@ -74,6 +74,6 @@
     "husky": "^4.2.3",
     "mocha": "^7.1.1",
     "smogon": "^1.1.1",
-    "typescript": "^3.8.3"
+    "typescript": "^3.9.7"
   }
 }

server/chat-commands/core.ts

@@ -15,7 +15,7 @@
 
 /* eslint no-else-return: "error" */
 import {Utils} from '../../lib/utils';
-type UserSettings = import('../users').User['settings'];
+import type {UserSettings} from '../users';
 
 const avatarTable = new Set([
 	'aaron',

server/chat.ts

@@ -23,8 +23,7 @@ To reload chat commands:
 
 */
 
-type RoomPermission = import('./user-groups').RoomPermission;
-type GlobalPermission = import('./user-groups').GlobalPermission;
+import type {RoomPermission, GlobalPermission} from './user-groups';
 
 export type PageHandler = (this: PageContext, query: string[], user: User, connection: Connection)
 => Promise<string | null | void> | string | null | void;

server/config-loader.ts

@@ -6,8 +6,7 @@
  */
 
 import * as defaults from '../config/config-example';
-type GroupInfo = import('./user-groups').GroupInfo;
-type EffectiveGroupSymbol = import('./user-groups').EffectiveGroupSymbol;
+import type {GroupInfo, EffectiveGroupSymbol} from './user-groups';
 
 export type ConfigType = typeof defaults & {
 	groups: {[symbol: string]: GroupInfo},

server/ladders.ts

@@ -16,7 +16,7 @@ const LadderStore: typeof LadderStoreT = (typeof Config === 'object' && Config.r
 const SECONDS = 1000;
 const PERIODIC_MATCH_INTERVAL = 60 * SECONDS;
 
-type ChallengeType = import('./room-battle').ChallengeType;
+import type {ChallengeType} from './room-battle';
 
 /**
  * This represents a user's search for a battle under a format.

server/rooms.ts

@@ -118,12 +118,10 @@ export interface RoomSettings {
 	isMultichannel?: boolean;
 }
 export type Room = GameRoom | ChatRoom;
-type Poll = import('./chat-plugins/poll').Poll;
-type Announcement = import('./chat-plugins/announcements').Announcement;
-type RoomEvent = import('./chat-plugins/room-events').RoomEvent;
-type RoomEventAlias = import('./chat-plugins/room-events').RoomEventAlias;
-type RoomEventCategory = import('./chat-plugins/room-events').RoomEventCategory;
-type Tournament = import('./tournaments/index').Tournament;
+import type {Poll} from './chat-plugins/poll';
+import type {Announcement} from './chat-plugins/announcements';
+import type {RoomEvent, RoomEventAlias, RoomEventCategory} from './chat-plugins/room-events';
+import type {Tournament} from './tournaments/index';
 
 export abstract class BasicRoom {
 	roomid: RoomID;

server/tournaments/generator-elimination.ts

@@ -6,7 +6,7 @@ interface ElimTree {
 	nextLayerLeafNodes: ElimNode[];
 }
 
-type TournamentPlayer = import('./index').TournamentPlayer;
+import type {TournamentPlayer} from './index';
 
 /**
  * There are two types of elim nodes, player nodes

server/tournaments/generator-round-robin.ts

@@ -4,7 +4,7 @@ interface Match {
 	result?: string;
 }
 
-type TournamentPlayer = import('./index').TournamentPlayer;
+import type {TournamentPlayer} from './index';
 
 export class RoundRobin {
 	readonly name: string;

server/users.ts

@@ -50,7 +50,7 @@ const MINUTES = 60 * 1000;
 const IDLE_TIMER = 60 * MINUTES;
 const STAFF_IDLE_TIMER = 30 * MINUTES;
 
-type StreamWorker = import('../lib/process-manager').StreamWorker;
+import type {StreamWorker} from '../lib/process-manager';
 
 /*********************************************************
  * Utility functions
@@ -305,6 +305,13 @@ export class Connection {
 
 type ChatQueueEntry = [string, RoomID, Connection];
 
+export interface UserSettings {
+	blockChallenges: boolean;
+	blockPMs: boolean | AuthLevel;
+	ignoreTickets: boolean;
+	hideBattlesFromTrainerCard: boolean;
+}
+
 // User
 export class User extends Chat.MessageContext {
 	readonly user: User;
@@ -341,12 +348,7 @@ export class User extends Chat.MessageContext {
 	lastMatch: string;
 	forcedPublic: string | null;
 
-	settings: {
-		blockChallenges: boolean,
-		blockPMs: boolean | AuthLevel,
-		ignoreTickets: boolean,
-		hideBattlesFromTrainerCard: boolean,
-	};
+	settings: UserSettings;
 
 	battleSettings: {
 		team: string,