helper.js

const path = require('path');
const changeCase = require('change-case');
const packageJson = require(path.resolve(process.cwd(), 'package.json'));

/**
 * Reads info from the package.json file.
 * @see [docs.hbs](docs.hbs) for an example of how to use this function
 *
 * @function package
 *
 * @param {string} key - The package property you want returned
 *
 * @returns {*}
 */
exports.package = (key) => packageJson[key];

/**
 * Implements the library [change-case](https://github.com/blakeembrey/change-case).
 * @see _[docs.hbs](docs.hbs) for an example of how to use this function_
 *
 * @function changeCase
 *
 * @param {string} to - Shorthand or full name for the change-case function.
 * @param {string} string - The string to modify
 *
 * @returns {string}
 */
exports.changeCase = (to, string) => {
	if (to === 'title') {
		to = 'capitalCase';
	}
	if (to.indexOf('Case') === -1) {
		to += 'Case';
	}
	return changeCase[to](string);
};

/**
 * Prefixes a string to the beginning of each line in the first string
 *
 * @function prefixLines
 *
 * @param {string} string - The string to modify
 * @param {string} replacer - The string to prefix to each line
 *
 * @returns {string}
 */
exports.prefixLines = (string, replacer = '') => string ? replacer + string.replace(/[\r\n]/g, '$&' + replacer) : '';

/**
 * Finds an object in an array with a matching key: value
 *
 * @function findBy
 *
 * @param {array} array - The array to search
 * @param {string} key - The key to compare
 * @param {string} value - The value to find
 *
 * @returns {array}
 */
exports.findBy = (array, key, value) => [array.find((item) => item[key] === value)].filter(Boolean);

/**
 * Calls string.replace
 *
 * @function replace
 *
 * @param {string} string - The string to modify
 * @param {string} pattern - The first arg for string.replace
 * @param {string} newString - The second arg for string.replace
 *
 * @returns {string}
 */
exports.replace = (string = '', pattern, newString) => string.replace(pattern, newString);

/**
 * Determines if the provided string is truthy and is different than the string provided the previous time this function was called
 *
 * @function isNew
 *
 * @param {string} string
 *
 * @returns {boolean}
 */
let current = '';
exports.isNew = function(string) {
	const isNew = string !== current;
	current = string;
	return string && isNew;
};