write to file in node

write.js

var fs = require('fs');
fs.writeFile("list.js", JSON.stringify(list), function(err) {
    if(err) {
        return console.log(err);
    }

    console.log("The file was saved!");
}); 

const TEMP = require('./temp.js')

// temp.js has
exports.emails = ['a','b']