Lesson 5: TypeScript setup and compile workflow: Testing focus

Concept Explanation

"TypeScript setup and compile workflow: Testing focus" gives you a practical way to strengthen one key idea through building and checking a small TypeScript solution. You will write, run, and refine code while using strongly typed JavaScript and compile-time safety to keep your work reliable. The lesson centers on the Beginner TypeScript skill: testing focus in TypeScript setup and compile workflow. You will also practice using precise type contracts and safe refactoring boundaries so your tests support confident changes. Lesson fingerprint: typescript:TypeScript Beginner:TypeScript setup and compile workflow:beginner-typescript-setup-and-compile-workflow-5:5.

Where to Put the Code

1. Define color and position variables at the top.
2. Create shape drawing or placement logic in the middle.
3. Render output (print, canvas, SVG, or styled block) at the end.

Command Reference

• Modify the baseline implementation and compare the results before and after the change.
• Identify where this pattern appears in real development work.
• Connect the code in this lesson to the main testing focus concept in the TypeScript workflow.
• Use a quick verification checkpoint to confirm the expected behavior.

Step-by-step Guide

1. Write a short note explaining what changed and why.
2. Refactor the code for readability while keeping the type contracts clear and safe to change.
3. Summarize the target skill in one sentence.
4. Type the starter code yourself and run it without changes.
5. Test one normal case and one edge case to confirm the behavior.

Practice Exercises

• Create a short output report that shows the solution works.
• Build a new TypeScript solution for this lesson with a different set of inputs.
• Extend the solution to fit a realistic TypeScript workflow scenario.

Coding Challenges

• Apply one quality rule about precise type contracts and safe refactoring across all code blocks.
• Scale the solution to handle a larger input set and review the results.

Mini Practice Tasks

• Add one guard clause for a known failure case.
• Run one quick test or use a short manual checklist.
• Write a one-line summary of what the code does.