Temporal TypeScript Hands-On

Four exercises for learning the Temporal TypeScript SDK. Each exercise builds on the previous one.

Prerequisites

• Node.js 18+
• Temporal CLI

Exercises

#	Topic	Concept
1	Converting to Temporal	Workflows, Activities, Workers
2	Child Workflows	Decomposing workflows into sub-workflows
3	Parallel Activities	Fan-out with Promise.all
4	Local Activities	Cost optimization for lightweight tasks

Running an Exercise

Each exercise has an exercise/ and a solution/ directory. Start in exercise/.

1. Start the Temporal dev server (one-time, leave running):

temporal server start-dev

2. Install dependencies:

cd <exercise_dir>
npm install

3. Start the worker (Terminal 2):

npm run worker

4. Run the starter (Terminal 3):

npm run starter

5. Open the Temporal UI:

Navigate to http://localhost:8233 to inspect workflow executions.

Domain

All exercises use an RFI (Request for Information) domain — a common construction project management workflow involving validation, reviewer assignment, and stakeholder notification.