Add typescript

(cherry picked from commit 910511dba03196f14bb238c8e15f060c12183c08)

frontend/.eslintrc.js

@@ -1,5 +1,9 @@
+// eslint-disable-next-line @typescript-eslint/no-var-requires
 const fs = require('fs');
+// eslint-disable-next-line @typescript-eslint/no-var-requires
 const path = require('path');
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const typescriptEslintRecommended = require('@typescript-eslint/eslint-plugin').configs.recommended;
 
 const frontendFolder = __dirname;
 
@@ -44,7 +48,8 @@ module.exports = {
     'react',
     'react-hooks',
     'simple-import-sort',
-    'import'
+    'import',
+    '@typescript-eslint'
   ],
 
   settings: {
@@ -227,7 +232,7 @@ module.exports = {
     'consistent-this': ['error', 'self'],
     'eol-last': 'error',
     'func-names': 'off',
-    'func-style': ['error', 'declaration'],
+    'func-style': ['error', 'declaration', { allowArrowFunctions: true }],
     indent: ['error', 2, { SwitchCase: 1 }],
     'key-spacing': ['error', { beforeColon: false, afterColon: true }],
     'keyword-spacing': ['error', { before: true, after: true }],
@@ -318,7 +323,9 @@ module.exports = {
   },
   overrides: [
     {
-      files: ['*.js'],
+      files: [
+        '*.js'
+      ],
       rules: {
         'simple-import-sort/imports': [
           'error',
@@ -333,6 +340,47 @@ module.exports = {
           }
         ]
       }
+    },
+    {
+      files: [
+        '*.ts',
+        '*.tsx'
+      ],
+
+      parser: '@typescript-eslint/parser',
+      parserOptions: {
+        project: './tsconfig.json'
+      },
+
+      rules: Object.assign(typescriptEslintRecommended.rules, {
+        'no-shadow': 'off',
+        // These should be enabled after cleaning things up
+        '@typescript-eslint/no-unused-vars': 'warn',
+        '@typescript-eslint/explicit-function-return-type': 'off',
+        'react/prop-types': 'off',
+        'simple-import-sort/imports': [
+          'error',
+          {
+            groups: [
+              // Packages
+              // Absolute Paths
+              // Relative Paths
+              // Css
+              ['^@?\\w', `^(${dirs})(/.*|$)`, '^\\.', '^\\..*css$']
+            ]
+          }
+        ]
+      })
+    },
+    {
+      files: [
+        '*.css.d.ts'
+      ],
+      rules: {
+        'filenames/match-exported': 'off',
+        'init-declarations': 'off',
+        'prettier/prettier': 'off'
+      }
     }
   ]
 };