change data of a file which contain an array using node - node.js

Question

I have created a file called config.js which looks like below:
const config = {
staticFiles:{
name:[
'./',
'./index.html',
'./script.js',
'./icon.jpg'
]
},
outputFolderName: "D:\\DemoApp",
sourceApplicationParentPath: "D:\\DemoApp\\"
};
Now I am reading list of files from sourceApplicationParentPath folder using node and have to update staticFiles array of above file. I am not sure how should I do it. Can someone please help.
Thanks in advance.

Answer 1

config.js
const config = {
staticFiles: {
name: ['./',
'./index.html',
'./script.js',
'./icon.jpg',
]
},
outputFolderName: 'D:\\DemoApp',
sourceApplicationParentPath: 'D:\\DemoApp'
};
module.exports = config;
index.js
var fs = require('fs'),
config = require('./config'),
util = require('util');
fs.readdir(config.sourceApplicationParentPath, function(err, files) {
if (err) console.log(err.message);
for (var i = 0; i < files.length; i++) {
if (config.staticFiles.name.indexOf(`./${files[i]}`) == -1) {
config.staticFiles.name.push('./' + files[i]);
}
if (i == (files.length - 1)) {
var buffer = `const config = \n ${util.inspect(config, false, 2, false)}; \n module.exports = config;`;
fs.writeFile('./config.js', buffer, function(err) {
err || console.log('Data replaced \n');
})
}
}
});
The Above code is tested and working fine.
You can add or change the object or an array or value in config.js without duplicate entry.

Answer 2

config.js
const config = {
staticFiles:{
name:[
'./',
'./index.html',
'./script.js',
'./icon.jpg'
]
},
outputFolderName: "D:\\DemoApp",
sourceApplicationParentPath: "D:\\DemoApp\\"
};
exports.config = config;
code for the file from where you want to change the data
var fs = require('fs');
var bodyparser = require('body-parser');
var config = require('./config.js')
//path of directory
var directoryPath = "D:\\DemoApp\\"
var data = config.config;
//passsing directoryPath and callback function
fs.readdir(directoryPath, function (err, files) {
//handling error
if (err) {
return console.log('Unable to scan directory: ' + err);
}
var dataToUpdate = data.staticFiles.name;
//listing all files using forEach
files.forEach(function (file) {
// Do whatever you want to do with the file
console.log(file)
dataToUpdate.push(file)
});
data.staticFiles.name = dataToUpdate;
var value = 'const config = ' + JSON.stringify(data) + ';' + '\n' + 'exports.config = config';
fs.writeFile('./config.js',value, er => {
if(er){
throw er;
}
else{console.log('success')}
});
});