refactor: enable an eslint rule, @typescript-eslint/strict-boolean-expressions
#633
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Sequel of #292
lintに危なげなboolean expressionsを起こってくれるルールを追加しました。
レビューの際は、以下のメリデメ吟味して良さそうか悪そうか判断いただければ幸いです。
pros
0
の誤falsyがあり得るnumber | undefined
の使用を禁止してくれます""
も同様cons
boolean | undefined
が怒られるのは若干うるさいか?boolean | undefined
の後ろに?? false
が付きました""
の確認をさせられるのは少しうるさいです