refactor: remove webpack.prod.config now that postinstall script is a…

…dded

patches/@edx+frontend-build+13.0.14.patch

@@ -62,3 +62,39 @@ index 5ce7716..6828971 100644
      historyApiFallback: {
        index: path.join(PUBLIC_PATH, 'index.html'),
        disableDotRule: true,
+diff --git a/node_modules/@edx/frontend-build/config/webpack.prod.config.js b/node_modules/@edx/frontend-build/config/webpack.prod.config.js
+index 2879dd9..32af231 100644
+--- a/node_modules/@edx/frontend-build/config/webpack.prod.config.js
++++ b/node_modules/@edx/frontend-build/config/webpack.prod.config.js
+@@ -12,6 +12,7 @@ const NewRelicSourceMapPlugin = require('@edx/new-relic-source-map-webpack-plugi
+ const HtmlWebpackPlugin = require('html-webpack-plugin');
+ const MiniCssExtractPlugin = require('mini-css-extract-plugin');
+ const path = require('path');
++const fs = require('fs');
+ const PostCssAutoprefixerPlugin = require('autoprefixer');
+ const PostCssRTLCSS = require('postcss-rtlcss');
+ const PostCssCustomMediaCSS = require('postcss-custom-media');
+@@ -23,6 +24,23 @@ const HtmlWebpackNewRelicPlugin = require('../lib/plugins/html-webpack-new-relic
+ const commonConfig = require('./webpack.common.config');
+ const presets = require('../lib/presets');
+
++/** This condition confirms whether the configuration for the MFE has switched to a JS-based configuration
++ * as previously implemented in frontend-build and frontend-platform. If the environment variable exists, then
++ * an env.config.js file will be created at the root directory and its env variables can be accessed with getConfig().
++ *
++ * https://github.com/openedx/frontend-build/blob/master/docs/0002-js-environment-config.md
++ * https://github.com/openedx/frontend-platform/blob/master/docs/decisions/0007-javascript-file-configuration.rst
++ */
++
++const envConfigPath = process.env.JS_CONFIG_FILEPATH;
++
++if (envConfigPath) {
++  const envConfigFilename = envConfigPath.slice(envConfigPath.indexOf('env.config'));
++  fs.copyFile(envConfigPath, envConfigFilename, (err) => {
++    if (err) { throw err; }
++  });
++}
++
+ // Add process env vars. Currently used only for setting the PUBLIC_PATH.
+ dotenv.config({
+   path: path.resolve(process.cwd(), '.env'),