NodeJS: Shift_JISな半角カナのファイルを一行づつ読み込んで内容を正常に出力

ShiftJISHankakuKanaToUnicode.js

const fs = require("fs");
const readline = require('readline');
const iconv = require('iconv-lite');

const readStream = fs.createReadStream("./shift_jis.txt", { encoding: "binary" });
const rl = readline.createInterface(readStream, {});

rl.on('line', function(line) {
  // Shift_JIS => unicode:
  console.log("line:", iconv.decode(new Buffer(line, "binary"), "Shift_JIS"));
}).on('close', function() {
  console.log("close");
});