docs: add TypeScript external storage snipsync snippets

features/snippets/external_storage/gcs_setup/gcs_driver_create.ts

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+/* eslint-disable @typescript-eslint/no-unused-vars */
+// @@@SNIPSTART typescript-gcs-driver-create
+import { Storage } from '@google-cloud/storage';
+import { GcsStorageDriver } from '@temporalio/external-storage-gcs';
+import { GoogleCloudGcsStorageDriverClient } from '@temporalio/external-storage-gcs-google-sdk';
+
+const storage = new Storage();
+
+const driver = new GcsStorageDriver({
+  client: new GoogleCloudGcsStorageDriverClient(storage),
+  bucket: 'my-temporal-payloads',
+});
+// @@@SNIPEND

features/snippets/external_storage/multiple_drivers/multiple_drivers.ts

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+import type { S3Client } from '@aws-sdk/client-s3';
+import { ExternalStorage, type StorageDriver } from '@temporalio/common';
+import { S3StorageDriver } from '@temporalio/external-storage-s3';
+import { AwsSdkS3StorageDriverClient } from '@temporalio/external-storage-s3-aws-sdk';
+/* eslint-disable @typescript-eslint/no-unused-vars */
+
+declare const s3Client: S3Client;
+declare const LegacyStorageDriver: new () => StorageDriver;
+
+{
+  // @@@SNIPSTART typescript-external-storage-multiple-drivers
+  const preferredDriver = new S3StorageDriver({
+    client: new AwsSdkS3StorageDriverClient(s3Client),
+    bucket: 'my-bucket',
+  });
+  const legacyDriver = new LegacyStorageDriver();
+
+  const externalStorage = new ExternalStorage({
+    drivers: [preferredDriver, legacyDriver],
+    driverSelector: () => preferredDriver,
+  });
+  // @@@SNIPEND
+}

features/snippets/external_storage/s3_setup/s3_driver_create.ts

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+/* eslint-disable @typescript-eslint/no-unused-vars */
+// @@@SNIPSTART typescript-s3-driver-create
+import { S3Client } from '@aws-sdk/client-s3';
+import { S3StorageDriver } from '@temporalio/external-storage-s3';
+import { AwsSdkS3StorageDriverClient } from '@temporalio/external-storage-s3-aws-sdk';
+
+const s3Client = new S3Client({ region: 'us-east-2' });
+
+const driver = new S3StorageDriver({
+  client: new AwsSdkS3StorageDriverClient(s3Client),
+  bucket: 'my-temporal-payloads',
+});
+// @@@SNIPEND

features/snippets/external_storage/s3_setup/s3_external_storage_setup.ts

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+/* eslint-disable @typescript-eslint/no-unused-vars */
+// @@@SNIPSTART typescript-s3-external-storage-setup
+import { Client, Connection } from '@temporalio/client';
+import { ExternalStorage } from '@temporalio/common';
+import { Worker } from '@temporalio/worker';
+
+async function createClientAndWorker() {
+  const dataConverter = {
+    externalStorage: new ExternalStorage({ drivers: [driver] }),
+  };
+
+  const connection = await Connection.connect();
+  const client = new Client({ connection, dataConverter });
+
+  const worker = await Worker.create({
+    workflowsPath: require.resolve('./workflows'),
+    taskQueue: 'my-task-queue',
+    dataConverter,
+  });
+}
+// @@@SNIPEND
+
+declare const driver: import('@temporalio/common').StorageDriver;

features/snippets/external_storage/threshold/threshold_config.ts

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+import { ExternalStorage, type StorageDriver } from '@temporalio/common';
+/* eslint-disable @typescript-eslint/no-unused-vars */
+
+declare const driver: StorageDriver;
+
+{
+  // @@@SNIPSTART typescript-external-storage-threshold
+  const dataConverter = {
+    externalStorage: new ExternalStorage({
+      drivers: [driver],
+      payloadSizeThreshold: 0,
+    }),
+  };
+  // @@@SNIPEND
+}