Workaround for CRA issue

- Add workaround for facebook/create-react-app#9929

.eslintrc.js

@@ -0,0 +1,53 @@
+const realConfig = {
+  extends: [
+    'airbnb-typescript',
+    'airbnb/hooks',
+    'plugin:@typescript-eslint/recommended',
+    'prettier',
+    'prettier/react',
+    'prettier/@typescript-eslint',
+  ],
+  env: {
+    node: true,
+    browser: true,
+    jest: true,
+  },
+  parserOptions: {
+    project: './tsconfig.json',
+  },
+  rules: {
+    '@typescript-eslint/explicit-function-return-type': [
+      'error',
+      { allowExpressions: true, allowTypedFunctionExpressions: true },
+    ],
+    '@typescript-eslint/no-unused-vars': ['error', { varsIgnorePattern: '_' }],
+    '@typescript-eslint/ban-types': 'off',
+    '@typescript-eslint/naming-convention': 'off',
+    'arrow-body-style': 'off',
+    'no-underscore-dangle': 'off',
+    'no-console': ['error', { allow: ['warn', 'error'] }],
+    'react/no-unescaped-entities': 'off',
+    'import/prefer-default-export': 'off',
+    'import/no-default-export': 'error',
+    'react/prop-types': 'off',
+    'no-nested-ternary': 'off',
+  },
+};
+
+const nopConfig = {
+  /*
+
+  This config is meant to do nothing.
+
+  It exists because there's no good way to disable ESLint in Create React App:
+  https://github.com/facebook/create-react-app/issues/9929
+
+  So the workaround here is to craft a config that does as little as possible,
+  and then conditionally use it.
+
+  */
+
+  ignorePatterns: ['**/*.ts', '**/*.tsx', './*.js', 'config/*.js'],
+};
+
+module.exports = process.env.DISABLE_ESLINT ? nopConfig : realConfig;

package.json

@@ -84,7 +84,7 @@
     "eject": "react-scripts eject",
     "lint": "yarn eslint './src/**/*.{ts,tsx}' --fix",
     "provision": "sh ./scripts/provision.sh",
-    "start": "react-scripts start",
+    "start": "DISABLE_ESLINT=true react-scripts start",
     "test:ropsten": "env-cmd -f .env.example.ropsten react-scripts test",
     "test": "react-scripts test",
     "script": "yarn ts-node --project ./scripts/tsconfig.json ./scripts/run.ts",