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Initial value when typing Template Refs #1950

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FloEdelmann asked this question in Q&A
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In TypeScript with Composition API → Typing Template Refs, it is recommended to use an explicit initial value of null:

const el = ref<HTMLInputElement | null>(null) // type: Ref<HTMLInputElement | null>

Why not simplify it to leverage the implicit undefined instead?

const el = ref<HTMLInputElement>() // type: Ref<HTMLInputElement | undefined>
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