build: update platform and implement env.config (#281)

* build: update paltform and implement env.config

* refactor: remove fallback.config file and update jest.config, env.config file

* refactor: update gatsby-config file

Author: Mashal-m

env.config.js

@@ -0,0 +1 @@
+module.exports = {};

gatsby-config.js

@@ -3,6 +3,7 @@
 // eg.
 // $ ACTIVE_ENV=<env_name> npm run build
 const activeEnv = process.env.ACTIVE_ENV || process.env.NODE_ENV || 'development';
+const path = require('path');
 
 require('dotenv').config({
   path: `.env.${activeEnv}`,
@@ -19,6 +20,16 @@ if (process.env.UNBRANDED_LANDING_PAGE === 'True') {
 module.exports = {
   pathPrefix: `${process.env.ENABLE_PATH_PREFIX ? process.env.HOSTNAME : '/'}`,
   plugins: [
+    {
+      resolve: 'gatsby-plugin-alias-imports',
+      options: {
+        alias: {
+          'env.config': path.join(__dirname, './env.config.js'),
+        },
+
+        extensions: ['.js', '.jsx'],
+      },
+    },
     {
       resolve: '@edx/gatsby-source-portal-designer',
       options: {

jest.config.js

@@ -1,10 +1,14 @@
+const path = require('path');
+
+const envConfigPath = path.join(__dirname, 'env.config.js');
 module.exports = {
   transform: {
     '^.+\\.jsx?$': '<rootDir>/jest-preprocess.js',
   },
   moduleNameMapper: {
     '.+\\.(css|styl|less|sass|scss)$': 'identity-obj-proxy',
     '.+\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$': '<rootDir>/fileTransformer.js',
+    'env.config': envConfigPath,
   },
   testPathIgnorePatterns: ['node_modules', '.cache'],
   transformIgnorePatterns: ['node_modules/(?!(gatsby|@edx/paragon|@edx/frontend-platform|@edx/frontend-component-footer-edx))'],