Simple template-literal colorized logger --- log.info`The only thing that will highlight is ${thisVariableHere}`

log.js

/**
 * Example usage:
  log.warn`Some message with ${variables} highlighted`;
  log.blue`Some message everything highlighted`;
  log.info`Some message with ${variables} highlighted`;
  log.blueBG`Some message everything highlighted`;
 */

const colours = {
  reset: '\x1b[0m',

  fx: {
    bright: '\x1b[1m',
    dim: '\x1b[2m',
    underscore: '\x1b[4m',
    blink: '\x1b[5m',
    reverse: '\x1b[7m',
    hidden: '\x1b[8m'
  },

  font: {
    black: '\x1b[30m',
    red: '\x1b[31m',
    green: '\x1b[32m',
    yellow: '\x1b[33m',
    blue: '\x1b[34m',
    magenta: '\x1b[35m',
    cyan: '\x1b[36m',
    white: '\x1b[37m'
  },

  bg: {
    black: '\x1b[40m',
    red: '\x1b[41m',
    green: '\x1b[42m',
    yellow: '\x1b[43m',
    blue: '\x1b[44m',
    magenta: '\x1b[45m',
    cyan: '\x1b[46m',
    white: '\x1b[47m'
  }
};

const loggy = {
  theme: {
    info: 'cyan',
    warn: 'red',
    success: 'green'
  },

  _raw(...args) {
    console.log(
      `${this.colour}${[]
        .concat(...args)
        .filter(a => a)
        .join('')}${colours.reset}`
    );
  },

  _keys(tag = '', strings, ...keys) {
    console.log(
      `${colours.bg[this.colourKey]}[${tag}]:${colours.reset}`,
      strings.reduce((acc, id, i) => {
        acc += id;

        if (keys[i]) {
          acc += `${this.colour}${keys[i]}`;
        }

        acc += colours.reset;

        return acc;
      }, '')
    );
  },

  set colour(v) {
    const group = /bg/.test(v.toLowerCase()) ? 'bg' : 'font';
    const key = v.replace(/bg/i, '');
    const value = colours[group][key];

    this._colour = { key, value };
  },

  get colour() {
    return this._colour.value;
  },

  get colourKey() {
    return this._colour.key;
  }
};

module.exports = new Proxy(loggy, {
  get(target, key) {
    if (key in target) {
      return target[key];
    } else if (Object.keys(colours.font).includes(key.replace(/bg/i, ''))) {
      target.colour = key;
      return (...args) => target._raw(...args);
    } else if (key in target.theme) {
      target.colour = target.theme[key];

      return (...args) => target._keys(key, ...args);
    }

    return target;
  }
});

/**
 * Example usage:
  log.warn`Some message with ${variables} highlighted`;
  log.blue`Some message everything highlighted`;
  log.info`Some message with ${variables} highlighted`;
  log.blueBG`Some message everything highlighted`;
 */