node-jsonfile: TypeError: fs.readFile is not a function

I am using your example to read data and getting an error with the following Error on line 26 of index.js 26 | fs.readFile(file, options, function (err, data) {

using the following example:

var jsonfile = require('jsonfile')
var file = '/tmp/data.json'
jsonfile.readFile(file, function(err, obj) {
  console.dir(obj)
})