Index: frontend/node_modules/eslint-config-react-app/index.js
===================================================================
--- frontend/node_modules/eslint-config-react-app/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/eslint-config-react-app/index.js	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,291 @@
+/**
+ * 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';
+
+// Inspired by https://github.com/airbnb/javascript but less opinionated.
+
+// We use eslint-loader so even warnings are very visible.
+// This is why we prefer to use "WARNING" level for potential errors,
+// and we try not to use "ERROR" level at all.
+
+// In the future, we might create a separate list of rules for production.
+// It would probably be more strict.
+
+// The ESLint browser environment defines all browser globals as valid,
+// even though most people don't know some of them exist (e.g. `name` or `status`).
+// This is dangerous as it hides accidentally undefined variables.
+// We blacklist the globals that we deem potentially confusing.
+// To use them, explicitly reference them, e.g. `window.name` or `window.status`.
+const restrictedGlobals = require('confusing-browser-globals');
+
+module.exports = {
+  extends: [require.resolve('./base')],
+
+  plugins: ['import', 'flowtype', 'jsx-a11y', 'react-hooks'],
+
+  overrides: [
+    {
+      files: ['**/*.ts?(x)'],
+      parser: '@typescript-eslint/parser',
+      parserOptions: {
+        ecmaVersion: 2018,
+        sourceType: 'module',
+        ecmaFeatures: {
+          jsx: true,
+        },
+
+        // typescript-eslint specific options
+        warnOnUnsupportedTypeScriptVersion: true,
+      },
+      plugins: ['@typescript-eslint'],
+      // If adding a typescript-eslint version of an existing ESLint rule,
+      // make sure to disable the ESLint rule here.
+      rules: {
+        // TypeScript's `noFallthroughCasesInSwitch` option is more robust (#6906)
+        'default-case': 'off',
+        // 'tsc' already handles this (https://github.com/typescript-eslint/typescript-eslint/issues/291)
+        'no-dupe-class-members': 'off',
+        // 'tsc' already handles this (https://github.com/typescript-eslint/typescript-eslint/issues/477)
+        'no-undef': 'off',
+
+        // Add TypeScript specific rules (and turn off ESLint equivalents)
+        '@typescript-eslint/consistent-type-assertions': 'warn',
+        'no-array-constructor': 'off',
+        '@typescript-eslint/no-array-constructor': 'warn',
+        'no-redeclare': 'off',
+        '@typescript-eslint/no-redeclare': 'warn',
+        'no-use-before-define': 'off',
+        '@typescript-eslint/no-use-before-define': [
+          'warn',
+          {
+            functions: false,
+            classes: false,
+            variables: false,
+            typedefs: false,
+          },
+        ],
+        'no-unused-expressions': 'off',
+        '@typescript-eslint/no-unused-expressions': [
+          'error',
+          {
+            allowShortCircuit: true,
+            allowTernary: true,
+            allowTaggedTemplates: true,
+          },
+        ],
+        'no-unused-vars': 'off',
+        '@typescript-eslint/no-unused-vars': [
+          'warn',
+          {
+            args: 'none',
+            ignoreRestSiblings: true,
+          },
+        ],
+        'no-useless-constructor': 'off',
+        '@typescript-eslint/no-useless-constructor': 'warn',
+      },
+    },
+  ],
+
+  // NOTE: When adding rules here, you need to make sure they are compatible with
+  // `typescript-eslint`, as some rules such as `no-array-constructor` aren't compatible.
+  rules: {
+    // http://eslint.org/docs/rules/
+    'array-callback-return': 'warn',
+    'default-case': ['warn', { commentPattern: '^no default$' }],
+    'dot-location': ['warn', 'property'],
+    eqeqeq: ['warn', 'smart'],
+    'new-parens': 'warn',
+    'no-array-constructor': 'warn',
+    'no-caller': 'warn',
+    'no-cond-assign': ['warn', 'except-parens'],
+    'no-const-assign': 'warn',
+    'no-control-regex': 'warn',
+    'no-delete-var': 'warn',
+    'no-dupe-args': 'warn',
+    'no-dupe-class-members': 'warn',
+    'no-dupe-keys': 'warn',
+    'no-duplicate-case': 'warn',
+    'no-empty-character-class': 'warn',
+    'no-empty-pattern': 'warn',
+    'no-eval': 'warn',
+    'no-ex-assign': 'warn',
+    'no-extend-native': 'warn',
+    'no-extra-bind': 'warn',
+    'no-extra-label': 'warn',
+    'no-fallthrough': 'warn',
+    'no-func-assign': 'warn',
+    'no-implied-eval': 'warn',
+    'no-invalid-regexp': 'warn',
+    'no-iterator': 'warn',
+    'no-label-var': 'warn',
+    'no-labels': ['warn', { allowLoop: true, allowSwitch: false }],
+    'no-lone-blocks': 'warn',
+    'no-loop-func': 'warn',
+    'no-mixed-operators': [
+      'warn',
+      {
+        groups: [
+          ['&', '|', '^', '~', '<<', '>>', '>>>'],
+          ['==', '!=', '===', '!==', '>', '>=', '<', '<='],
+          ['&&', '||'],
+          ['in', 'instanceof'],
+        ],
+        allowSamePrecedence: false,
+      },
+    ],
+    'no-multi-str': 'warn',
+    'no-global-assign': 'warn',
+    'no-unsafe-negation': 'warn',
+    'no-new-func': 'warn',
+    'no-new-object': 'warn',
+    'no-new-symbol': 'warn',
+    'no-new-wrappers': 'warn',
+    'no-obj-calls': 'warn',
+    'no-octal': 'warn',
+    'no-octal-escape': 'warn',
+    'no-redeclare': 'warn',
+    'no-regex-spaces': 'warn',
+    'no-restricted-syntax': ['warn', 'WithStatement'],
+    'no-script-url': 'warn',
+    'no-self-assign': 'warn',
+    'no-self-compare': 'warn',
+    'no-sequences': 'warn',
+    'no-shadow-restricted-names': 'warn',
+    'no-sparse-arrays': 'warn',
+    'no-template-curly-in-string': 'warn',
+    'no-this-before-super': 'warn',
+    'no-throw-literal': 'warn',
+    'no-undef': 'error',
+    'no-restricted-globals': ['error'].concat(restrictedGlobals),
+    'no-unreachable': 'warn',
+    'no-unused-expressions': [
+      'error',
+      {
+        allowShortCircuit: true,
+        allowTernary: true,
+        allowTaggedTemplates: true,
+      },
+    ],
+    'no-unused-labels': 'warn',
+    'no-unused-vars': [
+      'warn',
+      {
+        args: 'none',
+        ignoreRestSiblings: true,
+      },
+    ],
+    'no-use-before-define': [
+      'warn',
+      {
+        functions: false,
+        classes: false,
+        variables: false,
+      },
+    ],
+    'no-useless-computed-key': 'warn',
+    'no-useless-concat': 'warn',
+    'no-useless-constructor': 'warn',
+    'no-useless-escape': 'warn',
+    'no-useless-rename': [
+      'warn',
+      {
+        ignoreDestructuring: false,
+        ignoreImport: false,
+        ignoreExport: false,
+      },
+    ],
+    'no-with': 'warn',
+    'no-whitespace-before-property': 'warn',
+    'react-hooks/exhaustive-deps': 'warn',
+    'require-yield': 'warn',
+    'rest-spread-spacing': ['warn', 'never'],
+    strict: ['warn', 'never'],
+    'unicode-bom': ['warn', 'never'],
+    'use-isnan': 'warn',
+    'valid-typeof': 'warn',
+    'no-restricted-properties': [
+      'error',
+      {
+        object: 'require',
+        property: 'ensure',
+        message:
+          'Please use import() instead. More info: https://facebook.github.io/create-react-app/docs/code-splitting',
+      },
+      {
+        object: 'System',
+        property: 'import',
+        message:
+          'Please use import() instead. More info: https://facebook.github.io/create-react-app/docs/code-splitting',
+      },
+    ],
+    'getter-return': 'warn',
+
+    // https://github.com/benmosher/eslint-plugin-import/tree/master/docs/rules
+    'import/first': 'error',
+    'import/no-amd': 'error',
+    'import/no-anonymous-default-export': 'warn',
+    'import/no-webpack-loader-syntax': 'error',
+
+    // https://github.com/yannickcr/eslint-plugin-react/tree/master/docs/rules
+    'react/forbid-foreign-prop-types': ['warn', { allowInPropTypes: true }],
+    'react/jsx-no-comment-textnodes': 'warn',
+    'react/jsx-no-duplicate-props': 'warn',
+    'react/jsx-no-target-blank': 'warn',
+    'react/jsx-no-undef': 'error',
+    'react/jsx-pascal-case': [
+      'warn',
+      {
+        allowAllCaps: true,
+        ignore: [],
+      },
+    ],
+    'react/no-danger-with-children': 'warn',
+    // Disabled because of undesirable warnings
+    // See https://github.com/facebook/create-react-app/issues/5204 for
+    // blockers until its re-enabled
+    // 'react/no-deprecated': 'warn',
+    'react/no-direct-mutation-state': 'warn',
+    'react/no-is-mounted': 'warn',
+    'react/no-typos': 'error',
+    'react/require-render-return': 'error',
+    'react/style-prop-object': 'warn',
+
+    // https://github.com/evcohen/eslint-plugin-jsx-a11y/tree/master/docs/rules
+    'jsx-a11y/alt-text': 'warn',
+    'jsx-a11y/anchor-has-content': 'warn',
+    'jsx-a11y/anchor-is-valid': [
+      'warn',
+      {
+        aspects: ['noHref', 'invalidHref'],
+      },
+    ],
+    'jsx-a11y/aria-activedescendant-has-tabindex': 'warn',
+    'jsx-a11y/aria-props': 'warn',
+    'jsx-a11y/aria-proptypes': 'warn',
+    'jsx-a11y/aria-role': ['warn', { ignoreNonDOM: true }],
+    'jsx-a11y/aria-unsupported-elements': 'warn',
+    'jsx-a11y/heading-has-content': 'warn',
+    'jsx-a11y/iframe-has-title': 'warn',
+    'jsx-a11y/img-redundant-alt': 'warn',
+    'jsx-a11y/no-access-key': 'warn',
+    'jsx-a11y/no-distracting-elements': 'warn',
+    'jsx-a11y/no-redundant-roles': 'warn',
+    'jsx-a11y/role-has-required-aria-props': 'warn',
+    'jsx-a11y/role-supports-aria-props': 'warn',
+    'jsx-a11y/scope': 'warn',
+
+    // https://github.com/facebook/react/tree/main/packages/eslint-plugin-react-hooks
+    'react-hooks/rules-of-hooks': 'error',
+
+    // https://github.com/gajus/eslint-plugin-flowtype
+    'flowtype/define-flow-type': 'warn',
+    'flowtype/require-valid-file-annotation': 'warn',
+    'flowtype/use-flow-type': 'warn',
+  },
+};