[SDK-1576] Linting (auth0#4)

* Add prettier
* Add eslint

Author: adamjmcgrath

.eslintrc.js

@@ -0,0 +1,22 @@
+module.exports = {
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaVersion: 2020,
+    sourceType: 'module',
+    ecmaFeatures: {
+      jsx: true,
+    },
+  },
+  settings: {
+    react: {
+      version: 'detect',
+    },
+  },
+  extends: [
+    'plugin:react/recommended',
+    'plugin:@typescript-eslint/recommended',
+  ],
+  rules: {
+    '@typescript-eslint/camelcase': 'off',
+  },
+};

.prettierrc

@@ -0,0 +1,4 @@
+{
+  "singleQuote": true,
+  "printWidth": 80
+}

__tests__/helpers.tsx

@@ -7,7 +7,7 @@ export const createWrapper = ({
   domain = '__test_domain__',
 }: Partial<Auth0ClientOptions> = {}) => ({
   children,
-}: PropsWithChildren<{}>) => (
+}: PropsWithChildren<{}>): JSX.Element => (
   <Auth0Provider domain={domain} client_id={client_id}>
     {children}
   </Auth0Provider>

jest.config.js

@@ -5,7 +5,7 @@ module.exports = {
   preset: 'ts-jest',
   reporters: [
     'default',
-    ['jest-junit', { outputDirectory: 'test-results/jest' }]
+    ['jest-junit', { outputDirectory: 'test-results/jest' }],
   ],
-  testRegex: '/__tests__/.+test\.tsx?$'
+  testRegex: '/__tests__/.+test.tsx?$',
 };