fs.existsSyncを使う。node.jsのバージョンは、"v10.15.3"を使用する。
https://nodejs.org/api/fs.html#fs_fs_existssync_path
例
$ node
> fs = require('fs')
（出力は省略）
> fs.existsSync('foo.txt')
true
> fs.existsSync('bar.txt')
false
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