Add workflow-streams sample (#470)

* Add workflow-streams sample

Ports the five scenarios from samples-python/workflow_streams to TypeScript,
using the @temporalio/workflow-streams contrib package (currently on the
contrib/pubsub branch of sdk-typescript). Covers basic publish/subscribe,
reconnecting subscriber, external (non-Activity) publisher, bounded log via
truncate(), and LLM token streaming with retry handling.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* Use published Temporal SDK 1.18.0 for workflow-streams sample

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Add AI SDK team as code owners for AI samples

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Pin nanoid to ^3.3.8 and add workflow-streams to pnpm lockfile

Resolves semgrep supply-chain findings (CVE-2021-23566, CVE-2024-55565)
flagged on the workflow-streams sample, which was missing from the
workspace lockfile.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Register workflow-streams in shared-files sync; fix pre-push without TTY

- Add workflow-streams to list-of-samples.json so the pre-push hook's
  copy-shared-files script no longer prompts on every push.
- Exclude workflow-streams from .eslintrc.js sync (it adds
  src/llm-workflows.ts to the workflow lint rules) and from .post-create
  sync (its run command is `npm run workflow.publisher`).
- Skip the /dev/tty redirect in the pre-push hook when no terminal is
  attached, so pushes from IDE integrations and CI don't fail with
  "/dev/tty: Device not configured".

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Revert pre-push hook change

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Apply suggestion from @brianstrauch

* Apply suggestion from @brianstrauch

* Re-resolve next to 16.2.9 to fix lint-format-build

The lockfile had pinned next@16.3.0-preview.0 (briefly published as
"latest"), whose @next/swc-* binaries were never published, causing a
404 during next build in CI.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Don't number the scenarios in the workflow-streams README

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* Add tests for the workflow-streams sample

Mirrors the Go sample's coverage: time-skipping unit tests for the
order, pipeline, hub, ticker, and llmStreaming workflows, plus a
dev-server integration test that subscribes to the order workflow's
status and progress topics end to end. Runs in CI.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: brianstrauch

.github/CODEOWNERS

@@ -3,3 +3,5 @@
 # @temporalio/sdk will be requested for review when
 # someone opens a pull request.
 * @temporalio/sdk
+/ai-sdk/           @temporalio/sdk @temporalio/ai-sdk
+/workflow-streams/ @temporalio/sdk @temporalio/ai-sdk

.github/workflows/ci.yml

@@ -66,6 +66,7 @@ jobs:
             sleep-for-days
             standalone-activity
             timer-examples
+            workflow-streams
             message-passing/introduction
             message-passing/safe-message-handlers
             polling/infrequent

.scripts/copy-shared-files.mjs

@@ -49,6 +49,7 @@ const ESLINTRC_EXCLUDE = [
   'protobufs',
   'food-delivery',
   'nestjs-exchange-rates',
+  'workflow-streams',
 ];
 const ESLINTIGNORE_EXCLUDE = [
   'production',
@@ -80,6 +81,7 @@ const POST_CREATE_EXCLUDE = [
   'worker-versioning',
   'empty',
   'scratchpad',
+  'workflow-streams',
 ];
 
 const PRETTIERRC_EXCLUDE = ['food-delivery'];

.scripts/list-of-samples.json

@@ -51,6 +51,7 @@
     "vscode-debugger",
     "worker-specific-task-queues",
     "worker-versioning",
+    "workflow-streams",
     "message-passing/execute-update",
     "message-passing/introduction",
     "message-passing/safe-message-handlers",

pnpm-lock.yaml

@@ -0,0 +1,3 @@
+node_modules
+lib
+.eslintrc.js

workflow-streams/.eslintignore

@@ -0,0 +1,48 @@
+const { builtinModules } = require('module');
+
+const ALLOWED_NODE_BUILTINS = new Set(['assert']);
+
+module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    project: './tsconfig.json',
+    tsconfigRootDir: __dirname,
+  },
+  plugins: ['@typescript-eslint', 'deprecation'],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/eslint-recommended',
+    'plugin:@typescript-eslint/recommended',
+    'prettier',
+  ],
+  rules: {
+    // recommended for safety
+    '@typescript-eslint/no-floating-promises': 'error', // forgetting to await Activities and Workflow APIs is bad
+    'deprecation/deprecation': 'warn',
+
+    // code style preference
+    'object-shorthand': ['error', 'always'],
+
+    // relaxed rules, for convenience
+    '@typescript-eslint/no-unused-vars': [
+      'warn',
+      {
+        argsIgnorePattern: '^_',
+        varsIgnorePattern: '^_',
+      },
+    ],
+    '@typescript-eslint/no-explicit-any': 'off',
+  },
+  overrides: [
+    {
+      files: ['src/workflows.ts', 'src/workflows-*.ts', 'src/workflows/*.ts', 'src/llm-workflows.ts'],
+      rules: {
+        'no-restricted-imports': [
+          'error',
+          ...builtinModules.filter((m) => !ALLOWED_NODE_BUILTINS.has(m)).flatMap((m) => [m, `node:${m}`]),
+        ],
+      },
+    },
+  ],
+};

workflow-streams/.eslintrc.js

@@ -0,0 +1,2 @@
+lib
+node_modules

workflow-streams/.gitignore

@@ -0,0 +1 @@
+package-lock=false

workflow-streams/.npmrc

@@ -0,0 +1 @@
+22