Migrating Files Incrementally — quiz

You rename `login.helper.js` to `login.helper.ts` and immediately see 12 TypeScript errors. What is the correct first action?

• Rename it back to .js — this file is not ready for TypeScript migration
• Categorise the errors: fix safety-critical ones first (null dereferences, wrong return types), and use `// @ts-ignore` temporarily on lower-priority errors to keep the file compilable while work continues
• Add `// @ts-nocheck` at the top to suppress all errors and come back to them later
• Delete the file and rewrite it from scratch in TypeScript