Declare ambient properties from Dexie base class

When targeting ES2022 our old fields were emitted as class fields and thereby shadowing the base class fields. The `declare` modifier lets us tell TS to expect these fields to exist but not emit them.

app/src/lib/databases/github-user-database.ts

@@ -60,8 +60,8 @@ export interface IMentionableCacheEntry {
 }
 
 export class GitHubUserDatabase extends BaseDatabase {
-  public mentionables!: Dexie.Table<IDBMentionableUser, number>
-  public mentionableCache!: Dexie.Table<IMentionableCacheEntry, number>
+  public declare mentionables: Dexie.Table<IDBMentionableUser, number>
+  public declare mentionableCache: Dexie.Table<IMentionableCacheEntry, number>
 
   public constructor(name: string, schemaVersion?: number) {
     super(name, schemaVersion)

app/src/lib/databases/issues-database.ts

@@ -10,7 +10,7 @@ export interface IIssue {
 }
 
 export class IssuesDatabase extends BaseDatabase {
-  public issues!: Dexie.Table<IIssue, number>
+  public declare issues: Dexie.Table<IIssue, number>
 
   public constructor(name: string, schemaVersion?: number) {
     super(name, schemaVersion)

app/src/lib/databases/pull-request-database.ts

@@ -77,8 +77,11 @@ interface IPullRequestsLastUpdated {
 export type PullRequestKey = [number, number]
 
 export class PullRequestDatabase extends BaseDatabase {
-  public pullRequests!: Dexie.Table<IPullRequest, PullRequestKey>
-  public pullRequestsLastUpdated!: Dexie.Table<IPullRequestsLastUpdated, number>
+  public declare pullRequests: Dexie.Table<IPullRequest, PullRequestKey>
+  public declare pullRequestsLastUpdated: Dexie.Table<
+    IPullRequestsLastUpdated,
+    number
+  >
 
   public constructor(name: string, schemaVersion?: number) {
     super(name, schemaVersion)

app/src/lib/databases/repositories-database.ts

@@ -77,16 +77,22 @@ type BranchKey = [number, string]
 /** The repositories database. */
 export class RepositoriesDatabase extends BaseDatabase {
   /** The local repositories table. */
-  public repositories!: Dexie.Table<IDatabaseRepository, number>
+  public declare repositories: Dexie.Table<IDatabaseRepository, number>
 
   /** The GitHub repositories table. */
-  public gitHubRepositories!: Dexie.Table<IDatabaseGitHubRepository, number>
+  public declare gitHubRepositories: Dexie.Table<
+    IDatabaseGitHubRepository,
+    number
+  >
 
   /** A table containing the names of protected branches per repository. */
-  public protectedBranches!: Dexie.Table<IDatabaseProtectedBranch, BranchKey>
+  public declare protectedBranches: Dexie.Table<
+    IDatabaseProtectedBranch,
+    BranchKey
+  >
 
   /** The GitHub repository owners table. */
-  public owners!: Dexie.Table<IDatabaseOwner, number>
+  public declare owners: Dexie.Table<IDatabaseOwner, number>
 
   /**
    * Initialize a new repository database.

app/src/lib/stats/stats-database.ts

@@ -523,8 +523,8 @@ export interface IDailyMeasures {
 }
 
 export class StatsDatabase extends Dexie {
-  public launches!: Dexie.Table<ILaunchStats, number>
-  public dailyMeasures!: Dexie.Table<IDailyMeasures, number>
+  public declare launches: Dexie.Table<ILaunchStats, number>
+  public declare dailyMeasures: Dexie.Table<IDailyMeasures, number>
 
   public constructor(name: string) {
     super(name)