node.jsでcliツールをつくってるとき、ターミナルの幅を知りたい時があります。
以下で取得できます。
// 幅と高さ
process.stdout.getWindowSize()
// => [ 103, 27 ]
// 幅
process.stdout.columns
// => 103
// 高さ
process.stdout.rows
// => 27
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