Create a random theme with chalk: https://www.npmjs.com/package/chalk

create-random-chalk-theme.ts

import chalk, { Chalk } from 'chalk';

const modifiers: (keyof Chalk)[] = [
  'bold',
  'dim',
  'italic',
  'underline',
  'inverse',
];

const colors: (keyof Chalk)[] = [
  'black',
  'red',
  'green',
  'yellow',
  'blue',
  'magenta',
  'cyan',
  'white',
  'blackBright',
  'redBright',
  'greenBright',
  'yellowBright',
  'blueBright',
  'magentaBright',
  'cyanBright',
  'whiteBright',
];

const backgrounds: (keyof Chalk)[] = [
  'bgBlack',
  'bgRed',
  'bgGreen',
  'bgYellow',
  'bgBlue',
  'bgMagenta',
  'bgCyan',
  'bgWhite',
  'bgBlackBright',
  'bgRedBright',
  'bgGreenBright',
  'bgYellowBright',
  'bgBlueBright',
  'bgMagentaBright',
  'bgCyanBright',
  'bgWhiteBright',
];

export default (): Chalk => {
  const modifier = modifiers[Math.floor(Math.random() * modifiers.length)];
  const color = colors[Math.floor(Math.random() * colors.length)];
  const background =
    backgrounds[Math.floor(Math.random() * backgrounds.length)];

  let theme = chalk[modifier] as Chalk;
  theme = theme[color] as Chalk;
  theme = theme[background] as Chalk;

  return theme;
};