Why and When to Migrate — quiz

A QA team's Playwright test suite crashes at runtime with `TypeError: Cannot read properties of undefined (reading 'click')`. The variable `page` was passed as `null` due to a setup error — no editor warning appeared. With TypeScript's `strictNullChecks` enabled, this would have been:

• A runtime error regardless, since TypeScript compiles to JavaScript
• Caught at compile time — TypeScript would flag passing `null` where `Page` is expected, turning a 2am CI failure into an immediate editor error
• A lint error that TypeScript enables automatically without any configuration
• Prevented only by adding explicit runtime null checks in JavaScript