Migrating JavaScript to TypeScript
Comes up in: Hiring manager, Behavioural
This concept is being written. It gets the full five steps — explanation, predict, interview angle, practice with tests, and review cards. Here is exactly what it will cover, so you can study it elsewhere in the meantime.
What it covers
allowJs+checkJs- JSDoc types
- incremental strictness
- tracking
anycount - codemods
- getting team buy-in (staff-level story)
Words you will know
What you will practise
- migration plan for a 200-file app
Interview questions this answers
- How would you migrate a large JavaScript codebase to TypeScript?
- What changed in TypeScript 7 and what should a team watch out for when upgrading?