chore: configure eslint to warn only on ts files

Author: josephgregoryii

.eslintrc.js

@@ -2,26 +2,45 @@ module.exports = {
   extends: [
     'plugin:@newrelic/eslint-plugin-newrelic/react',
     'plugin:@newrelic/eslint-plugin-newrelic/prettier',
-    'plugin:@typescript-eslint/recommended',
     'plugin:jsx-a11y/recommended',
     'plugin:react-hooks/recommended',
   ],
-  plugins: ['react', 'jsx-a11y', '@typescript-eslint', 'graphql'],
+  plugins: ['react', 'jsx-a11y', 'graphql'],
   settings: {
     react: {
       version: 'detect',
     },
   },
-
-  parser: '@typescript-eslint/parser',
+  overrides: [
+    {
+      files: ['*.ts', '*.tsx'],
+      extends: [
+        'plugin:@typescript-eslint/recommended',
+        'plugin:@typescript-eslint/recommended-requiring-type-checking',
+      ],
+      parserOptions: {
+        project: ['./tsconfig.json'],
+        tsconfigRootDir: __dirname,
+      },
+      rules: {
+        '@typescript-eslint/no-var-requires': 2,
+        '@typescript-eslint/no-empty-function': 2,
+        '@typescript-eslint/explicit-module-boundary-types': 2,
+        '@typescript-eslint/explicit-function-return-type': 2,
+        '@typescript-eslint/no-unsafe-argument': 2,
+        '@typescript-eslint/no-use-before-define': 2,
+        '@typescript-eslint/no-explicit-any': 2,
+        '@typescript-eslint/camelcase': 2,
+      },
+    },
+  ],
   parserOptions: {
-    files: ['*.ts', '*.tsx', '*.js', '*.jsx'],
+    files: ['*.js', '*.jsx'],
     ecmaFeatures: {
       jsx: true,
     },
     ecmaVersion: 2018,
     sourceType: 'module',
-    project: ['./tsconfig.json'],
   },
   env: {
     browser: true,
@@ -46,16 +65,5 @@ module.exports = {
     'jsx-a11y/no-onchange': 'off',
     'react/react-in-jsx-scope': 'off',
     'react/prop-types': 'off',
-    '@typescript-eslint/no-var-requires': 'off',
-    '@typescript-eslint/no-empty-function': 'off',
-    '@typescript-eslint/explicit-module-boundary-types': 1,
-    '@typescript-eslint/explicit-function-return-type': 1,
-    '@typescript-eslint/no-unsafe-argument': 1,
-    '@typescript-eslint/no-use-before-define': 'off',
-    '@typescript-eslint/no-explicit-any': 1,
-
-    // As typescript continuously gets added, we should
-    // turn this back on.
-    '@typescript-eslint/camelcase': 'off',
   },
 };

tsconfig.json

@@ -1,23 +1,23 @@
 {
-    "compilerOptions": {
-        "outDir": "./built",
-        "allowJs": true,
-        "jsx": "react-jsx",
-        "jsxImportSource": "@emotion/react",
-        "target": "es6",
-        "moduleResolution": "node",
-        "sourceMap": true,
-        "allowSyntheticDefaultImports": true,
-        "noImplicitAny": true,
-        "plugins": [
-            {
-              "name": "ts-graphql-plugin",
-              "schema": "src/__generated__/gatsby-schema.graphql",
-              "tag": "graphql"
-            }
-          ]
-    },
-    // add/remove file paths to include typescript configuration
-    "include": ["src/**/*", "scripts/**/*", "gatsby/**/*", "gatsby-*.js"],
-    "exclude": ["node_modules"]
-}
+  "compilerOptions": {
+    "outDir": "./built",
+    "allowJs": true,
+    "jsx": "react-jsx",
+    "jsxImportSource": "@emotion/react",
+    "target": "es6",
+    "moduleResolution": "node",
+    "sourceMap": true,
+    "allowSyntheticDefaultImports": true,
+    "noImplicitAny": true,
+    "plugins": [
+      {
+        "name": "ts-graphql-plugin",
+        "schema": "src/__generated__/gatsby-schema.graphql",
+        "tag": "graphql"
+      }
+    ]
+  },
+  "include": ["src/**/*", "scripts/**/*", "gatsby/**/*", "gatsby-*.js"],
+  "exclude": ["node_modules"]
+}
+