convert eslint configuration file to .eslintrc.js (#3669)

Author: crashuniverse

.eslintrc

@@ -0,0 +1,30 @@
+/**
+ * Copyright (c) 2016-present, Facebook, Inc. All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+module.exports = {
+  'extends': [
+    './packages/eslint-config-fb-strict/index.js',
+    'plugin:import/errors'
+  ],
+  'parser': 'babel-eslint',
+  'rules': {
+    'computed-property-spacing': 0,
+    'flowtype/boolean-style': 2,
+    'flowtype/no-primitive-constructor-types': 2,
+    'flowtype/require-valid-file-annotation': 2,
+    'max-len': 0,
+    'no-multiple-empty-lines': 1,
+    'import/order': 2,
+    'import/no-duplicates': 2,
+    'import/no-unresolved': [2, { 'ignore': ['^types/'] }]
+  },
+  'plugins': [
+    'markdown',
+    'import'
+  ]
+};