output.filename is required webpack - node.js

Question

I tried to do the webpack exports in the following way. I tried to convert the async to sync ( regarding fs.readdir) to get the total files within directory.
const webpack = require('webpack');
const async = require('async');
const path = require('path');
const fs = require('fs');
var fileList = [];
var promiso = new Promise(function(res, rej) {
fs.readdir(__dirname + "/imports/components", function(err, files) {
files.forEach(function(file) {
console.log("file", file);
fileList.push(file);
});
let config = {
entry: {
'myPages': fileList[0]
},
module: {
loaders: [
// Javascript: js, jsx
{
test: /\.jsx?$/,
loader: 'babel-loader',
query: {
presets: ['es2015', 'react']
}
}
]
},
output: {
path: path.resolve(__dirname, 'dist'),
filename: './bundler.js'
},
}
res(config)
})
});
promiso.then(function(mess) {
console.log("-------------------------mess", mess);
module.exports = mess;
});
I am getting following error
'output.filename' is required, either in config file or as --output-filename

Answer 1

Here you should return promise itself and then use it anywhere else. Because the require cannot work your way. Modules in Node that you load with require() are loaded synchronously and it is not possible for require to return any value that is loaded asynchronously.
module.exports = promise
And in another file use it as follows
require('path-to-file').then( (mess) => {
// Use mess
}).then(null, (err) => {
// Error handling
})