Adds eslint config extends with only whitespace rules enabled

Adds a change to pull in the eslint config from the project root, turn off all rules except the whitespace rules explicitly listed in the array.

Author: sharmilajesupaul

packages/eslint-config-airbnb-base/package.json

@@ -66,6 +66,7 @@
     "node": ">= 4"
   },
   "dependencies": {
-    "eslint-restricted-globals": "^0.1.1"
+    "eslint-restricted-globals": "^0.1.1",
+    "object.entries": "^1.0.4"
   }
 }

packages/eslint-config-airbnb-base/whitespace.js

@@ -0,0 +1,73 @@
+const baseConfig = require('./');
+const entries = require('object.entries');
+const { CLIEngine } = require('eslint');
+
+function onlyErrorOnRules(rulesToError, config) {
+  const errorsOnly = { ...config };
+  const cli = new CLIEngine({ baseConfig: config, useEslintrc: false });
+  const baseRules = cli.getConfigForFile('./').rules;
+
+  entries(baseRules).forEach(([key, value]) => {
+    if (rulesToError.indexOf(key) === -1) {
+      if (Array.isArray(value)) {
+        errorsOnly.rules[key] = ['warn'].concat(value.slice(1));
+      } else if (typeof value === 'number') {
+        errorsOnly.rules[key] = 1;
+      } else {
+        errorsOnly.rules[key] = 'warn';
+      }
+    }
+  });
+
+  return errorsOnly;
+}
+
+module.exports = onlyErrorOnRules([
+  'array-bracket-newline',
+  'array-bracket-spacing',
+  'array-element-newline',
+  'arrow-spacing',
+  'block-spacing',
+  'comma-spacing',
+  'computed-property-spacing',
+  'dot-location',
+  'eol-last',
+  'func-call-spacing',
+  'function-paren-newline',
+  'generator-star-spacing',
+  'implicit-arrow-linebreak',
+  'indent',
+  'key-spacing',
+  'keyword-spacing',
+  'line-comment-position',
+  'linebreak-style',
+  'multiline-ternary',
+  'newline-per-chained-call',
+  'no-irregular-whitespace',
+  'no-mixed-spaces-and-tabs',
+  'no-multi-spaces',
+  'no-regex-spaces',
+  'no-spaced-func',
+  'no-trailing-spaces',
+  'no-whitespace-before-property',
+  'nonblock-statement-body-position',
+  'object-curly-newline',
+  'object-curly-spacing',
+  'object-property-newline',
+  'one-var-declaration-per-line',
+  'operator-linebreak',
+  'padded-blocks',
+  'padding-line-between-statements',
+  'rest-spread-spacing',
+  'semi-spacing',
+  'semi-style',
+  'space-before-blocks',
+  'space-before-function-paren',
+  'space-in-parens',
+  'space-infix-ops',
+  'space-unary-ops',
+  'spaced-comment',
+  'switch-colon-spacing',
+  'template-tag-spacing',
+  'import/newline-after-import',
+], baseConfig);

packages/eslint-config-airbnb/whitespace.js

@@ -0,0 +1 @@
+require('../eslint-config-airbnb-base/whitespace');