Run SQL initialize in parallel with createWindow

ts/sql/initialize.ts

@@ -8,7 +8,18 @@ import sql from './Server';
 
 const getRealPath = pify(fs.realpath);
 
-export async function initialize(): Promise<void> {
+// Called from renderer.
+export async function initialize(isTesting = false): Promise<void> {
+  if (!isTesting) {
+    ipc.send('database-ready');
+
+    await new Promise<void>(resolve => {
+      ipc.once('database-ready', () => {
+        resolve();
+      });
+    });
+  }
+
   const configDir = await getRealPath(ipc.sendSync('get-user-data-path'));
   const key = ipc.sendSync('user-config-key');
 

ts/sql/main.ts

@@ -44,6 +44,10 @@ type PromisePair<T> = {
 export class MainSQL {
   private readonly worker: Worker;
 
+  private isReady = false;
+
+  private onReady: Promise<void> | undefined;
+
   private readonly onExit: Promise<void>;
 
   private seq = 0;
@@ -81,16 +85,37 @@ export class MainSQL {
   }
 
   public async initialize(options: InitializeOptions): Promise<void> {
-    return this.send({ type: 'init', options });
+    if (this.isReady || this.onReady) {
+      throw new Error('Already initialized');
+    }
+
+    this.onReady = this.send({ type: 'init', options });
+
+    await this.onReady;
+
+    this.onReady = undefined;
+    this.isReady = true;
   }
 
   public async close(): Promise<void> {
+    if (!this.isReady) {
+      throw new Error('Not initialized');
+    }
+
     await this.send({ type: 'close' });
     await this.onExit;
   }
 
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   public async sqlCall(method: string, args: ReadonlyArray<any>): Promise<any> {
+    if (this.onReady) {
+      await this.onReady;
+    }
+
+    if (!this.isReady) {
+      throw new Error('Not initialized');
+    }
+
     return this.send({ type: 'sqlCall', method, args });
   }