How to read a file in NodeJS from a relative path

read-file.js

const fs = require('fs')
const path = require('path')
const html1 = fs.readFileSync(path.join(__dirname, '../test/fixtures/page1.html'), 'utf-8')

// in one line
const html2 = require('fs').readFileSync(require('path').join(__dirname, '../test/fixtures/page2.html'), 'utf-8')

// with a function
const readFile = relativePath => require('fs').readFileSync(require('path').join(__dirname, relativePath), 'utf-8')
const html3 = readFile('../test/fixtures/page3.html')
const html4 = readFile('../test/fixtures/page4.html')