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node_modules/eslint-config-airbnb-base/rules/variables.js

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+const confusingBrowserGlobals = require('confusing-browser-globals');
+
+module.exports = {
+  rules: {
+    // enforce or disallow variable initializations at definition
+    'init-declarations': 'off',
+
+    // disallow the catch clause parameter name being the same as a variable in the outer scope
+    'no-catch-shadow': 'off',
+
+    // disallow deletion of variables
+    'no-delete-var': 'error',
+
+    // disallow labels that share a name with a variable
+    // https://eslint.org/docs/rules/no-label-var
+    'no-label-var': 'error',
+
+    // disallow specific globals
+    'no-restricted-globals': [
+      'error',
+      {
+        name: 'isFinite',
+        message:
+          'Use Number.isFinite instead https://github.com/airbnb/javascript#standard-library--isfinite',
+      },
+      {
+        name: 'isNaN',
+        message:
+          'Use Number.isNaN instead https://github.com/airbnb/javascript#standard-library--isnan',
+      },
+    ].concat(confusingBrowserGlobals),
+
+    // disallow declaration of variables already declared in the outer scope
+    'no-shadow': 'error',
+
+    // disallow shadowing of names such as arguments
+    'no-shadow-restricted-names': 'error',
+
+    // disallow use of undeclared variables unless mentioned in a /*global */ block
+    'no-undef': 'error',
+
+    // disallow use of undefined when initializing variables
+    'no-undef-init': 'error',
+
+    // disallow use of undefined variable
+    // https://eslint.org/docs/rules/no-undefined
+    // TODO: enable?
+    'no-undefined': 'off',
+
+    // disallow declaration of variables that are not used in the code
+    'no-unused-vars': ['error', { vars: 'all', args: 'after-used', ignoreRestSiblings: true }],
+
+    // disallow use of variables before they are defined
+    'no-use-before-define': ['error', { functions: true, classes: true, variables: true }],
+  }
+};