https://blog.leko.jp/post/special-chars-for-cli

.gitignore

node_modules/

hello-world.js

const chalk = require('chalk')

console.log(
  chalk.red('H')
  + chalk.magenta('e')
  + chalk.yellow('l')
  + chalk.green('l')
  + chalk.blue('o')
  + ' '
  + chalk.cyan('w')
  + chalk.white('o')
  + chalk.yellowBright('r')
  + chalk.greenBright('l')
  + chalk.blueBright('d')
  + chalk.cyanBright('!')
  + chalk.whiteBright('!')
)

package.json

{
  "name": "cli",
  "version": "0.0.1",
  "description": "https://blog.leko.jp/post/special-chars-for-cli",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "git+ssh://git@gist.github.com/76727c0c4634b57de7231ba4427d5ed1.git"
  },
  "author": "Leko <leko.noor@gmail.com>",
  "license": "MIT",
  "bugs": {
    "url": "https://gist.github.com/76727c0c4634b57de7231ba4427d5ed1"
  },
  "homepage": "https://gist.github.com/76727c0c4634b57de7231ba4427d5ed1",
  "dependencies": {
    "chalk": "^2.0.1",
    "ink": "^0.3.0"
  }
}

powerline-spaced.js

const chalk = require('chalk')

console.log(
  chalk.white.bgRed(' Hello ')
  + ' '
  + chalk.red.bgBlack('')
  + ' '
  + chalk.bgBlack(' world!! ')
  + ' '
  + chalk.black('')
)

powerline.js

const chalk = require('chalk')

const ucfirst = str => str.slice(0, 1).toUpperCase() + str.slice(1)
const toBgColor = color => `bg${ucfirst(color)}`
const width = () => process.stdout.columns
const eraser = () => `\r${' '.repeat(width())}\r`

class Indicator {
  constructor ({ text, icon, color, backgroundColor }) {
    this.text = text
    this.icon = icon
    this.color = color
    this.backgroundColor = backgroundColor
  }

  getColor () {
    return this.color
  }

  getBackgroundColor () {
    return this.backgroundColor
  }

  render () {
    let str = this.text
    if (this.icon) {
      str = `${this.icon} ${str}`
    }

    return chalk[this.getColor()][toBgColor(this.getBackgroundColor())](` ${str} `)
  }
}

class IndicatorGlue {
  constructor (componentA, componentB, chr = '') {
    this.componentA = componentA
    this.componentB = componentB
    this.chr = chr
  }

  render () {
    let decorator = chalk[this.componentA.getBackgroundColor()]
    if (this.componentB) {
      decorator = decorator[toBgColor(this.componentB.getBackgroundColor())]
    }

    return decorator(this.chr)
  }
}

class IndicatorStack {
  constructor () {
    this.indicators = []
  }

  getComponents () {
    return this.indicators
  }

  add (indicator) {
    this.indicators.push(indicator)
  }

  render () {
    const components = this.indicators.reduce((acc, indicator, i) => acc.concat([
      indicator,
      new IndicatorGlue(indicator, this.indicators[i + 1])
    ]), [])

    return components.map(component => component.render()).join('')
  }
}

class Powerline {
  constructor () {
    this.stacks = []
  }

  add (stack) {
    this.stacks.push(stack)
  }

  render () {
    return eraser() + this.stacks.map(stack => stack.render()).join('')
  }
}

const powerline = new Powerline()
const stack = new IndicatorStack()

stack.add(new Indicator({ text: 'White',   color: 'red',   backgroundColor: 'white',   icon: '✉' }))
stack.add(new Indicator({ text: 'Cyan',    color: 'white', backgroundColor: 'cyan',    icon: '' }))
stack.add(new Indicator({ text: 'Blue',    color: 'white', backgroundColor: 'blue' }))
stack.add(new Indicator({ text: 'Magenta', color: 'white', backgroundColor: 'magenta', icon: '♥' }))
stack.add(new Indicator({ text: 'Red',     color: 'white', backgroundColor: 'red',     icon: '' }))
stack.add(new Indicator({ text: 'Yellow',  color: 'white', backgroundColor: 'yellow',  icon: '⚡︎' }))
stack.add(new Indicator({ text: 'Green',   color: 'white', backgroundColor: 'green' }))

powerline.add(stack)

console.log('\n\n\n')
console.log(powerline.render())
console.log('\n\n\n')

spinner.js

const chalk = require('chalk')

const FPS = 20
const colors = [
  'red',
  'magenta',
  'yellow',
  'green',
  'blue',
  'cyan',
  'white',
  'yellowBright',
  'greenBright',
  'blueBright',
  'cyanBright',
  'whiteBright',
]
const frames = '⠋⠙⠹⠸⠼⠴⠦⠧⠇⠏'.split('')
let cursor = 0

setInterval(() => {
  cursor = (cursor + 1) % frames.length
  process.stdout.write(`\r \r${chalk[colors[cursor]](frames[cursor])}`)
}, 1000 / FPS)