index.js

/* eslint-disable indent */
import gradient from 'gradient-string';
import boxen from 'boxen';
import stripAnsi from 'strip-ansi';
import { stripIndents } from 'common-tags';

const ALLOWED_GRADIENTS = [
  'cristal',
  'teen',
  'mind',
  'morning',
  'vice',
  'passion',
  'fruit',
  'instagram',
  'atlas',
  'retro',
  'summer',
  'pastel',
  'rainbow',
];

// Type checking in JS is a mess.
// Warning: real bad code ahead
function handleAllErrors(boxText, boxOptions, gradientOptions) {
  if (typeof boxText !== 'string') {
    throw new Error('No box text provided');
  }

  if (!boxOptions) {
    throw new Error('No box options provided');
  }

  if (Object.prototype.toString.call(boxOptions) !== '[object Object]') {
    throw new Error('Box options must be an object');
  }

  if (!gradientOptions) {
    throw new Error('No gradient specified');
  }

  if (gradientOptions) {
    if (
      !(
        typeof gradientOptions === 'string' ||
        (Array.isArray(gradientOptions) &&
          gradientOptions.every(
            (gradientOption) => typeof gradientOption === 'string'
          ))
      )
    ) {
      throw new TypeError(
        stripIndents`Gradient must be a string or an array of valid color codes
        Received type: ${typeof gradientOptions}. Expected type: 'string' or 'array'`
      );
    }

    if (
      typeof gradientOptions === 'string' &&
      !ALLOWED_GRADIENTS.includes(gradientOptions)
    ) {
      throw new Error(
        stripIndents`Gradient name must be one of the following: ${ALLOWED_GRADIENTS.join(
          ', '
        )}. Received gradient name: '${gradientOptions}'`
      );
    }
  }
}

// eslint-disable-next-line consistent-return
/**
 * Creates a box with a gradient border in the terminal
 * @param {string} boxText - The text to be displayed in the box
 * @param {Object} boxOptions - The configuration options for the box as per the boxen package
 * @param {string|string[]} gradientOptions - The gradient to be used for the box. Can be a string or an array of valid color codes
 * @returns {string} - The boxen text with the gradient border
 * @example
 * console.log(
 *  gradientBox('Hello World',
 *    {
 *      padding: 2,
 *      margin: 1,
 *      borderStyle: 'round',
 *    },
 *    'instagram',
 *  })
 * );
 */
function gradientBox(
  boxText,
  boxOptions = { borderStyle: 'round', padding: 0.75, marging: 0.75 },
  gradientOptions = ['#11998e', '#38ef7d']
) {
  handleAllErrors(boxText, boxOptions, gradientOptions);

  if (typeof gradientOptions === 'string') {
    const box = gradient[gradientOptions].multiline(
      stripAnsi(boxen(boxText, boxOptions))
    );

    return `${box}\u001b[0m`;
  }
  if (gradientOptions instanceof Array) {
    const box = gradient([...gradientOptions]).multiline(
      stripAnsi(boxen(boxText, boxOptions))
    );

    return `${box}\u001b[0m`;
  }

  return '';
}

export default gradientBox;