style: cherry-pick eslint-related change from 27fcc60...6925874

Author: SilentDepth

.eslintrc

@@ -0,0 +1,23 @@
+const __PROD__ = process.env.NODE_ENV === 'production'
+
+module.exports = {
+  root: true,
+  env: {
+    es2020: true,
+    node: true,
+  },
+  "parser": "babel-eslint",
+  extends: [
+    'eslint:recommended',
+  ],
+  rules: {
+    'no-var': 'error',
+    'quotes': ['error', 'single'],
+    'semi': ['error', 'never'],
+    'object-curly-spacing': ['error', 'never'],
+    'space-before-function-paren': ['error', 'always'],
+    'comma-dangle': [__PROD__ ? 'error' : 'warn', 'always-multiline'],
+    'no-debugger': __PROD__ ? 'error' : 'off',
+    'no-console': 'off',
+  },
+}