Letting AI Add TypeScript to a JavaScript File

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.

Practice this safely

Try this with a school, hobby, or family example where the stakes are low. Use the AI output as a draft you can question, not as the final answer.

1. 1Ask AI to explain gradual typing in plain language, then underline anything that sounds uncertain or too broad.
2. 2Give it one detail from "Letting AI Add TypeScript to a JavaScript File" and ask for two possible next steps plus one reason each step might be wrong.
3. 3Check strict mode against a trusted source, teacher, adult, expert, or original document before you use it.