Index: frontend/node_modules/babel-preset-react-app/create.js
===================================================================
--- frontend/node_modules/babel-preset-react-app/create.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/babel-preset-react-app/create.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,227 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+'use strict';
+
+const path = require('path');
+
+const validateBoolOption = (name, value, defaultValue) => {
+  if (typeof value === 'undefined') {
+    value = defaultValue;
+  }
+
+  if (typeof value !== 'boolean') {
+    throw new Error(`Preset react-app: '${name}' option must be a boolean.`);
+  }
+
+  return value;
+};
+
+module.exports = function (api, opts, env) {
+  if (!opts) {
+    opts = {};
+  }
+
+  var isEnvDevelopment = env === 'development';
+  var isEnvProduction = env === 'production';
+  var isEnvTest = env === 'test';
+
+  var useESModules = validateBoolOption(
+    'useESModules',
+    opts.useESModules,
+    isEnvDevelopment || isEnvProduction
+  );
+  var isFlowEnabled = validateBoolOption('flow', opts.flow, true);
+  var isTypeScriptEnabled = validateBoolOption(
+    'typescript',
+    opts.typescript,
+    true
+  );
+  var areHelpersEnabled = validateBoolOption('helpers', opts.helpers, true);
+  var useAbsoluteRuntime = validateBoolOption(
+    'absoluteRuntime',
+    opts.absoluteRuntime,
+    true
+  );
+
+  var absoluteRuntimePath = undefined;
+  if (useAbsoluteRuntime) {
+    absoluteRuntimePath = path.dirname(
+      require.resolve('@babel/runtime/package.json')
+    );
+  }
+
+  if (!isEnvDevelopment && !isEnvProduction && !isEnvTest) {
+    throw new Error(
+      'Using `babel-preset-react-app` requires that you specify `NODE_ENV` or ' +
+        '`BABEL_ENV` environment variables. Valid values are "development", ' +
+        '"test", and "production". Instead, received: ' +
+        JSON.stringify(env) +
+        '.'
+    );
+  }
+
+  return {
+    presets: [
+      isEnvTest && [
+        // ES features necessary for user's Node version
+        require('@babel/preset-env').default,
+        {
+          targets: {
+            node: 'current',
+          },
+        },
+      ],
+      (isEnvProduction || isEnvDevelopment) && [
+        // Latest stable ECMAScript features
+        require('@babel/preset-env').default,
+        {
+          // Allow importing core-js in entrypoint and use browserlist to select polyfills
+          useBuiltIns: 'entry',
+          // Set the corejs version we are using to avoid warnings in console
+          corejs: 3,
+          // Exclude transforms that make all code slower
+          exclude: ['transform-typeof-symbol'],
+        },
+      ],
+      [
+        require('@babel/preset-react').default,
+        {
+          // Adds component stack to warning messages
+          // Adds __self attribute to JSX which React will use for some warnings
+          development: isEnvDevelopment || isEnvTest,
+          // Will use the native built-in instead of trying to polyfill
+          // behavior for any plugins that require one.
+          ...(opts.runtime !== 'automatic' ? { useBuiltIns: true } : {}),
+          runtime: opts.runtime || 'classic',
+        },
+      ],
+      isTypeScriptEnabled && [require('@babel/preset-typescript').default],
+    ].filter(Boolean),
+    plugins: [
+      // Strip flow types before any other transform, emulating the behavior
+      // order as-if the browser supported all of the succeeding features
+      // https://github.com/facebook/create-react-app/pull/5182
+      // We will conditionally enable this plugin below in overrides as it clashes with
+      // @babel/plugin-proposal-decorators when using TypeScript.
+      // https://github.com/facebook/create-react-app/issues/5741
+      isFlowEnabled && [
+        require('@babel/plugin-transform-flow-strip-types').default,
+        false,
+      ],
+      // Experimental macros support. Will be documented after it's had some time
+      // in the wild.
+      require('babel-plugin-macros'),
+      // Disabled as it's handled automatically by preset-env, and `selectiveLoose` isn't
+      // yet merged into babel: https://github.com/babel/babel/pull/9486
+      // Related: https://github.com/facebook/create-react-app/pull/8215
+      // [
+      //   require('@babel/plugin-transform-destructuring').default,
+      //   {
+      //     // Use loose mode for performance:
+      //     // https://github.com/facebook/create-react-app/issues/5602
+      //     loose: false,
+      //     selectiveLoose: [
+      //       'useState',
+      //       'useEffect',
+      //       'useContext',
+      //       'useReducer',
+      //       'useCallback',
+      //       'useMemo',
+      //       'useRef',
+      //       'useImperativeHandle',
+      //       'useLayoutEffect',
+      //       'useDebugValue',
+      //     ],
+      //   },
+      // ],
+      // Turn on legacy decorators for TypeScript files
+      isTypeScriptEnabled && [
+        require('@babel/plugin-proposal-decorators').default,
+        false,
+      ],
+      // class { handleClick = () => { } }
+      // Enable loose mode to use assignment instead of defineProperty
+      // See discussion in https://github.com/facebook/create-react-app/issues/4263
+      // Note:
+      // 'loose' mode configuration must be the same for
+      // * @babel/plugin-proposal-class-properties
+      // * @babel/plugin-proposal-private-methods
+      // * @babel/plugin-proposal-private-property-in-object
+      // (when they are enabled)
+      [
+        require('@babel/plugin-proposal-class-properties').default,
+        {
+          loose: true,
+        },
+      ],
+      [
+        require('@babel/plugin-proposal-private-methods').default,
+        {
+          loose: true,
+        },
+      ],
+      [
+        require('@babel/plugin-proposal-private-property-in-object').default,
+        {
+          loose: true,
+        },
+      ],
+      // Adds Numeric Separators
+      require('@babel/plugin-proposal-numeric-separator').default,
+      // Polyfills the runtime needed for async/await, generators, and friends
+      // https://babeljs.io/docs/en/babel-plugin-transform-runtime
+      [
+        require('@babel/plugin-transform-runtime').default,
+        {
+          corejs: false,
+          helpers: areHelpersEnabled,
+          // By default, babel assumes babel/runtime version 7.0.0-beta.0,
+          // explicitly resolving to match the provided helper functions.
+          // https://github.com/babel/babel/issues/10261
+          version: require('@babel/runtime/package.json').version,
+          regenerator: true,
+          // https://babeljs.io/docs/en/babel-plugin-transform-runtime#useesmodules
+          // We should turn this on once the lowest version of Node LTS
+          // supports ES Modules.
+          useESModules,
+          // Undocumented option that lets us encapsulate our runtime, ensuring
+          // the correct version is used
+          // https://github.com/babel/babel/blob/090c364a90fe73d36a30707fc612ce037bdbbb24/packages/babel-plugin-transform-runtime/src/index.js#L35-L42
+          absoluteRuntime: absoluteRuntimePath,
+        },
+      ],
+      isEnvProduction && [
+        // Remove PropTypes from production build
+        require('babel-plugin-transform-react-remove-prop-types').default,
+        {
+          removeImport: true,
+        },
+      ],
+      // Optional chaining and nullish coalescing are supported in @babel/preset-env,
+      // but not yet supported in webpack due to support missing from acorn.
+      // These can be removed once webpack has support.
+      // See https://github.com/facebook/create-react-app/issues/8445#issuecomment-588512250
+      require('@babel/plugin-proposal-optional-chaining').default,
+      require('@babel/plugin-proposal-nullish-coalescing-operator').default,
+    ].filter(Boolean),
+    overrides: [
+      isFlowEnabled && {
+        exclude: /\.tsx?$/,
+        plugins: [require('@babel/plugin-transform-flow-strip-types').default],
+      },
+      isTypeScriptEnabled && {
+        test: /\.tsx?$/,
+        plugins: [
+          [
+            require('@babel/plugin-proposal-decorators').default,
+            { legacy: true },
+          ],
+        ],
+      },
+    ].filter(Boolean),
+  };
+};