TypeScript · Junior · Question 43 of 75

What does TypeScript do with `const el = document.getElementById('app')`?

✓Correct answer: Infers HTMLElement | null and requires a null check
2Infers HTMLDivElement automatically from the page markup
3Infers any, because DOM APIs aren't typed in TypeScript

Explanation

The element may not exist, so the type includes null. For a specific type, use querySelector<HTMLInputElement>('#email') or an instanceof HTMLInputElement check. DOM types are part of the standard library (lib: ['dom']).

What does TypeScript do with `const el = document.getElementById('app')`?

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What does TypeScript do with const el = document.getElementById('app')?

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What does TypeScript do with `const el = document.getElementById('app')`?