Make getDatabaseFile safer

src/client.ts

@@ -335,18 +335,25 @@ export class SQLocal {
 			.filter((part) => part !== '');
 		const fileName = path.pop();
 
+		const tempFileName = `backup-${Date.now()}--${fileName}`;
+		const tempFilePath = `${path.join('/')}/${tempFileName}`;
+
 		if (!fileName) {
 			throw new Error('Failed to parse the database file name.');
 		}
 
+		await this.exec('VACUUM INTO ?', [tempFilePath]);
+
 		let dirHandle = await navigator.storage.getDirectory();
 		for (let dirName of path)
 			dirHandle = await dirHandle.getDirectoryHandle(dirName);
 
-		const fileHandle = await dirHandle.getFileHandle(fileName);
+		const fileHandle = await dirHandle.getFileHandle(tempFileName);
 		const file = await fileHandle.getFile();
+		const fileBuffer = await file.arrayBuffer();
+		await dirHandle.removeEntry(tempFileName);
 
-		return new File([file], fileName, {
+		return new File([fileBuffer], fileName, {
 			type: 'application/x-sqlite3',
 		});
 	};

test/get-database-file.test.ts

@@ -31,10 +31,8 @@ describe('getDatabaseFile', () => {
 		}
 	});
 
-	it('should throw when requested database has not been created', async () => {
-		const { getDatabaseFile } = new SQLocal(fileName);
-		expect(async () => await getDatabaseFile()).rejects.toThrowError(
-			'A requested file or directory could not be found at the time an operation was processed.'
-		);
+	it('should not throw when requested database has not been created', async () => {
+		const { getDatabaseFile } = new SQLocal('blank.sqlite3');
+		expect(getDatabaseFile()).resolves.not.toThrow();
 	});
 });