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[React + TypeScript ] HTMLSelectElementのつもりなのに、Property 'options' does not exist on type 'HTMLElement'.

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#課題
今日もTypeScriptから怒られた。

something.tsx
const months = document.getElementById('datetime_2i')
months ? (months.options[1].selected = true) : null
エラー
> Property 'options' does not exist on type 'HTMLElement'.

HTMLSelectElementのつもりなんだけどな。

#結論
つもりなら書けと言うことらしい。
地味に時間取られる。

something.tsx
const months = document.getElementById('datetime_2i') as HTMLSelectElement
months ? (months.options[1].selected = true) : null

TypeScript素人故怒られまくる。
エラー解決するたびに只管メモします。

#参考情報
Property 'selectedOptions','selectedIndex','options' does not exist on type 'HTMLElement'
https://sharepoint.stackexchange.com/questions/283252/property-selectedoptions-selectedindex-options-does-not-exist-on-type-htm

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