misc: remove more unused create-react-app stuff

Part of #10.

config/env.js

@@ -2,10 +2,6 @@
 
 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) {
@@ -14,32 +10,6 @@ if (!NODE_ENV) {
   );
 }
 
-// https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use
-const dotenvFiles = [
-  `${paths.dotenv}.${NODE_ENV}.local`,
-  // 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}.${NODE_ENV}`,
-  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.  Variable expansion is supported in .env files.
-// https://github.com/motdotla/dotenv
-// https://github.com/motdotla/dotenv-expand
-dotenvFiles.forEach(dotenvFile => {
-  if (fs.existsSync(dotenvFile)) {
-    require('dotenv-expand')(
-      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/facebook/create-react-app/issues/253.

config/paths.js

@@ -56,14 +56,8 @@ module.exports = {
   appPublic: resolveApp('public'),
   appHtml: resolveApp('public/index.html'),
   appIndexJs: resolveModule(resolveApp, 'src/index'),
-  appPackageJson: resolveApp('package.json'),
   appSrc: resolveApp('src'),
-  appTsConfig: resolveApp('tsconfig.json'),
-  appJsConfig: resolveApp('jsconfig.json'),
-  yarnLockFile: resolveApp('yarn.lock'),
   testsSetup: resolveModule(resolveApp, 'src/setupTests'),
-  proxySetup: resolveApp('src/setupProxy.js'),
-  appNodeModules: resolveApp('node_modules'),
   swSrc: resolveModule(resolveApp, 'src/service-worker'),
   publicUrlOrPath,
 };