Comb for lines that create difficulty reading code.

linestyle.js

const readline = require('readline');
const colors = require('colors');

const rl = readline.createInterface({
  input: process.stdin,
});
let line = 1, warn = 0;

rl.on('line', (ln) => {
  if (ln.length > 80) console.warn(('#'+(++warn)+' ').red.bold
                                    +('Line '+line+': ').yellow
                                    +'Character limit exceeded ('
                                    +ln.length+' chars).');
  line++;
});

rl.on('close', () => {
  let str = warn+' warnings generated.';
  if (warn > 0) console.warn(str.yellow.bold);
  else console.log(str.green.bold);
});