Lesson 1329 of 1570
Letting AI Add TypeScript to a JavaScript File
Hand Claude a .js file and ask for a fully typed .ts version.
Lesson map
What this lesson covers
Learning path
The main moves in order
- 1The big idea
- 2gradual typing
- 3strict mode
- 4any
Concept cluster
Terms to connect while reading
Section 1
The big idea
gradual typing works best when AI infers types from how the code is used
Some examples
- Sharing a 50-line utility file
- Asking for strict mode types
- Reviewing every any it adds
Try it!
Open your favorite AI tool and try one of the examples above. Pick the one that matches what you are actually working on this week. Spend 10 minutes, no more. Notice what worked and what did not — that's the real lesson.
Key terms in this lesson
End-of-lesson quiz
Check what stuck
15 questions · Score saves to your progress.
Tutor
Curious about “Letting AI Add TypeScript to a JavaScript File”?
Ask anything about this lesson. I’ll answer using just what you’re reading — short, friendly, grounded.
Progress saved locally in this browser. Sign in to sync across devices.
Related lessons
Keep going
Creators · 11 min
Migrating a JS codebase to TypeScript strict with Claude
Phase a strict-mode TypeScript migration with Claude proposing types one module at a time.
Creators · 11 min
AI and TypeScript strict mode migration
Migrate a JS/loose-TS codebase to strict TypeScript with LLM help.
Builders · 35 min
Tests as Prompts — an Unexpected Superpower
Writing a test first is not just good engineering. It is the clearest possible prompt for an AI. Let's use tests to make AI code reliable.