TypeScript: Fix linter configuration for test files (reduxjs#3518)

* Fix linter configuration for test files

* Add separate ESLint config to test/typescript

* Also lint TypeScript files in examples


Former-commit-id: 27bf970
Former-commit-id: 21540b4

Author: nickserv

.eslintrc.js

@@ -30,14 +30,5 @@ module.exports = {
         argsIgnorePattern: '^_' // ignore unused variables whose name is '_'
       }
     ]
-  },
-
-  overrides: [
-    {
-      files: 'test/**/*.js',
-      env: {
-        jest: true
-      }
-    }
-  ]
+  }
 }

package.json.REMOVED.git-id

@@ -1 +1 @@
-3f59918dd740a6ed21c273b014b65b206a7deac2
+a420204899b7d3f5cc906d995619a72d58d11b9c

test/typescript/.eslintrc.js

@@ -0,0 +1,7 @@
+module.exports = {
+  rules: {
+    'no-unused-expressions': 'off',
+    '@typescript-eslint/no-namespace': 'off',
+    '@typescript-eslint/no-unused-vars': 'off'
+  }
+}