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Custom webpack entry

Hello,

I have this problem, I made a custom entry for my Webpack.
The Webpack file and the one that is installed by default with sage, I just added the object config.entry.

'use strict'; // eslint-disable-line

const webpack = require('webpack');
const merge = require('webpack-merge');
const CleanPlugin = require('clean-webpack-plugin');
const ExtractTextPlugin = require('extract-text-webpack-plugin');
//const StyleLintPlugin = require('stylelint-webpack-plugin');
const CopyGlobsPlugin = require('copy-globs-webpack-plugin');
const FriendlyErrorsWebpackPlugin = require('friendly-errors-webpack-plugin');

const desire = require('./util/desire');
const config = require('./config');


config.entry =  { 
  main: [ 
    './scripts/main.js', 
    './styles/main.scss' 
  ],
  _awards: [
    './styles/components/_awards.scss',
    './scripts/components/_awards.js',
  ],
  grid: [ 
    './styles/components/_grid.scss' 
  ]
}

const assetsFilenames = (config.enabled.cacheBusting) ? config.cacheBusting : '[name]';

let webpackConfig = {
  context: config.paths.assets,
  entry: config.entry,
  devtool: (config.enabled.sourceMaps ? '#source-map' : undefined),
  output: {
    path: config.paths.dist,
    publicPath: config.publicPath,
    filename: `scripts/${assetsFilenames}.js`,
  },
 ........

as you can see it generates a css file for each element of the config.entry object, so css for main, awards, and grid, the problem is for javascritp, because I should have the javascritp file only for main and awards, but for some reason it also generates a javascritp file for grid and inside the file there is this

!function(t){var e={};function n(r){if(e[r])return e[r].exports;var o=e[r]={i:r,l:!1,exports:{}};return t[r].call(o.exports,o,o.exports,n),o.l=!0,o.exports}n.m=t,n.c=e,n.d=function(t,e,r){n.o(t,e)||Object.defineProperty(t,e,{configurable:!1,enumerable:!0,get:r})},n.n=function(t){var e=t&&t.__esModule?function(){return t.default}:function(){return t};return n.d(e,"a",e),e},n.o=function(t,e){return Object.prototype.hasOwnProperty.call(t,e)},n.p="/app/themes/test/dist/",n(n.s=55)}({55:function(t,e,n){t.exports=n(56)},56:function(t,e){}});

How can I tell webpack that I only need the files that I have inside the config.entry?