cssMinifier.js

const fs = require('fs');

//functional util
const pipe = (...fns) => (value) => fns.reduce((acc, fn) => fn(acc), value);
const reduceByFun = (data) => (fun) => (initValue) => data.reduce((p,n) => fun(p,n), initValue); 

//string utils
const trim = (s) => s.trim(s);
const removeNewLine = (s) => s.replace(/[\r\n]/g, '');

//main
fs.readFile('./target.css', { encoding: 'utf-8' }, (err, str) => {
    const gubuns = [',', ':', ';', '{', '}'];
    const result = CSSMinifier.run(str, gubuns);
    console.log(result);
});

//CSSMinifier Object
const CSSMinifier = {
    run(str, gubuns) {
        const removeSpaces = reduceByFun(gubuns)(this.removeSpaceAroudChar);
        const pipeSet = [removeNewLine, trim, removeSpaces];
        return this.executePipe(str, pipeSet);
    },

    removeSpaceAroudChar(s, gubun) {
        const reg = new RegExp(`\\s*${gubun}\\s*`, 'g');
        return s.replace(reg, `${gubun}`);
    },

    executePipe(str, pipeSet) {
        const result = pipe(...pipeSet)(str)
        return result;
    }
}

target.css

/* page-setup.css */
html {
    font-size: 62.5%;
    box-sizing: border-box;
  }
  
  html, body {
    height: 100%;
    width: 100%;
    padding: 0px;
    margin: 0px;
  }
  
  div, p, h1, h2, h3, h4, h5, h6, ul, ol, li, dl, dt, dd,
  table, th, td, form, fieldset, legend, input, textarea, blockquote, button {
    margin:0 auto;
    padding:0;
    border:1px solid  red;
  }
  
  *, *:before, *:after {
    box-sizing: inherit;
  }
  
  li {
    list-style: none;
  }