diff --git a/.eslintignore b/.eslintignore
index 900b426..610e2be 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1,4 +1,9 @@
build/
-public/gameoflife/
-*.test.js
+config/
+scripts/
+
registerServiceWorker.js
+*.test.js
+
+public/gameoflife/
+
diff --git a/config/env.js b/config/env.js
new file mode 100644
index 0000000..8b39b6c
--- /dev/null
+++ b/config/env.js
@@ -0,0 +1,90 @@
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+const paths = require('./paths');
+
+// Make sure that including paths.js after env.js will read .env variables.
+delete require.cache[require.resolve('./paths')];
+
+const NODE_ENV = process.env.NODE_ENV;
+if (!NODE_ENV) {
+ throw new Error(
+ 'The NODE_ENV environment variable is required but was not specified.'
+ );
+}
+
+// https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use
+var dotenvFiles = [
+ `${paths.dotenv}.${NODE_ENV}.local`,
+ `${paths.dotenv}.${NODE_ENV}`,
+ // Don't include `.env.local` for `test` environment
+ // since normally you expect tests to produce the same
+ // results for everyone
+ NODE_ENV !== 'test' && `${paths.dotenv}.local`,
+ paths.dotenv,
+].filter(Boolean);
+
+// Load environment variables from .env* files. Suppress warnings using silent
+// if this file is missing. dotenv will never modify any environment variables
+// that have already been set.
+// https://github.com/motdotla/dotenv
+dotenvFiles.forEach(dotenvFile => {
+ if (fs.existsSync(dotenvFile)) {
+ require('dotenv').config({
+ path: dotenvFile,
+ });
+ }
+});
+
+// We support resolving modules according to `NODE_PATH`.
+// This lets you use absolute paths in imports inside large monorepos:
+// https://github.com/facebookincubator/create-react-app/issues/253.
+// It works similar to `NODE_PATH` in Node itself:
+// https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders
+// Note that unlike in Node, only *relative* paths from `NODE_PATH` are honored.
+// Otherwise, we risk importing Node.js core modules into an app instead of Webpack shims.
+// https://github.com/facebookincubator/create-react-app/issues/1023#issuecomment-265344421
+// We also resolve them to make sure all tools using them work consistently.
+const appDirectory = fs.realpathSync(process.cwd());
+process.env.NODE_PATH = (process.env.NODE_PATH || '')
+ .split(path.delimiter)
+ .filter(folder => folder && !path.isAbsolute(folder))
+ .map(folder => path.resolve(appDirectory, folder))
+ .join(path.delimiter);
+
+// Grab NODE_ENV and REACT_APP_* environment variables and prepare them to be
+// injected into the application via DefinePlugin in Webpack configuration.
+const REACT_APP = /^REACT_APP_/i;
+
+function getClientEnvironment(publicUrl) {
+ const raw = Object.keys(process.env)
+ .filter(key => REACT_APP.test(key))
+ .reduce(
+ (env, key) => {
+ env[key] = process.env[key];
+ return env;
+ },
+ {
+ // Useful for determining whether we’re running in production mode.
+ // Most importantly, it switches React into the correct mode.
+ NODE_ENV: process.env.NODE_ENV || 'development',
+ // Useful for resolving the correct path to static assets in `public`.
+ // For example, 
.
+ // This should only be used as an escape hatch. Normally you would put
+ // images into the `src` and `import` them in code to get their paths.
+ PUBLIC_URL: publicUrl,
+ }
+ );
+ // Stringify all values so we can feed into Webpack DefinePlugin
+ const stringified = {
+ 'process.env': Object.keys(raw).reduce((env, key) => {
+ env[key] = JSON.stringify(raw[key]);
+ return env;
+ }, {}),
+ };
+
+ return { raw, stringified };
+}
+
+module.exports = getClientEnvironment;
diff --git a/config/jest/cssTransform.js b/config/jest/cssTransform.js
new file mode 100644
index 0000000..f1534f6
--- /dev/null
+++ b/config/jest/cssTransform.js
@@ -0,0 +1,14 @@
+'use strict';
+
+// This is a custom Jest transformer turning style imports into empty objects.
+// http://facebook.github.io/jest/docs/tutorial-webpack.html
+
+module.exports = {
+ process() {
+ return 'module.exports = {};';
+ },
+ getCacheKey() {
+ // The output is always the same.
+ return 'cssTransform';
+ },
+};
diff --git a/config/jest/fileTransform.js b/config/jest/fileTransform.js
new file mode 100644
index 0000000..ffce0da
--- /dev/null
+++ b/config/jest/fileTransform.js
@@ -0,0 +1,12 @@
+'use strict';
+
+const path = require('path');
+
+// This is a custom Jest transformer turning file imports into filenames.
+// http://facebook.github.io/jest/docs/tutorial-webpack.html
+
+module.exports = {
+ process(src, filename) {
+ return `module.exports = ${JSON.stringify(path.basename(filename))};`;
+ },
+};
diff --git a/config/paths.js b/config/paths.js
new file mode 100644
index 0000000..6d16efc
--- /dev/null
+++ b/config/paths.js
@@ -0,0 +1,55 @@
+'use strict';
+
+const path = require('path');
+const fs = require('fs');
+const url = require('url');
+
+// Make sure any symlinks in the project folder are resolved:
+// https://github.com/facebookincubator/create-react-app/issues/637
+const appDirectory = fs.realpathSync(process.cwd());
+const resolveApp = relativePath => path.resolve(appDirectory, relativePath);
+
+const envPublicUrl = process.env.PUBLIC_URL;
+
+function ensureSlash(path, needsSlash) {
+ const hasSlash = path.endsWith('/');
+ if (hasSlash && !needsSlash) {
+ return path.substr(path, path.length - 1);
+ } else if (!hasSlash && needsSlash) {
+ return `${path}/`;
+ } else {
+ return path;
+ }
+}
+
+const getPublicUrl = appPackageJson =>
+ envPublicUrl || require(appPackageJson).homepage;
+
+// We use `PUBLIC_URL` environment variable or "homepage" field to infer
+// "public path" at which the app is served.
+// Webpack needs to know it to put the right