【TypeScript】型エラーで泣いた人の末路 🎯 60秒でnullチェックの大切さを理解！ ・getElementById は null を返す可能性あり ・感嘆符（!）で黙らせると痛い目に ・正しい対処法を解説 📝 こんな方におすすめ ・Object is possibly 'null' に悩んでいる方 ・型エラーを感嘆符で無視してしまう方 🔗 詳しい解説 ・TypeScript公式: https://www.typescriptlang.org/
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