Issue #2912961 by dawehner, droplet, drpal: Step 0 JS codestyle: Exclude non passing eslint rules

core/.eslintrc.passing.json

@@ -0,0 +1,30 @@
+{
+  "extends": "./.eslintrc.json",
+  "rules": {
+    "no-var": "off",
+    "no-useless-escape": "off",
+    "no-useless-concat": "off",
+    "no-use-before-define": "off",
+    "no-throw-literal": "off",
+    "no-shadow": "off",
+    "no-restricted-syntax": "off",
+    "no-new": "off",
+    "no-multi-assign": "off",
+    "no-mixed-operators": "off",
+    "no-lonely-if": "off",
+    "no-empty": "off",
+    "no-continue": "off",
+    "no-confusing-arrow": "off",
+    "newline-per-chained-call": "off",
+    "new-cap": "off",
+    "max-len": "off",
+    "default-case": "off",
+    "comma-dangle": "off",
+    "camelcase": "off",
+    "array-callback-return": "off",
+    "vars-on-top": "off",
+    "prefer-rest-params": "off",
+    "padded-blocks": "off",
+    "prefer-const": "off"
+  }
+}

core/package.json

@@ -9,6 +9,8 @@
     "watch:js": "node ./scripts/js/babel-es6-watch.js",
     "watch:js-dev": "cross-env NODE_ENV=development node ./scripts/js/babel-es6-watch.js",
     "lint:core-js": "node ./node_modules/eslint/bin/eslint.js --ext=.es6.js . || exit 0",
+    "lint:core-js-passing": "node ./node_modules/eslint/bin/eslint.js --quiet --config=.eslintrc.passing.json --ext=.es6.js . || exit 0",
+    "lint:core-js-stats": "node ./node_modules/eslint/bin/eslint.js --format=./scripts/js/eslint-stats-by-type.js --ext=.es6.js . || exit 0",
     "lint:css": "stylelint \"**/*.css\" || exit 0",
     "lint:css-checkstyle": "stylelint \"**/*.css\" --custom-formatter ./node_modules/stylelint-checkstyle-formatter/index.js || exit 0"
   },

core/scripts/js/eslint-stats-by-type.js

@@ -0,0 +1,35 @@
+module.exports = function (results) {
+  results = results || [];
+
+  const errorType = {
+    warnings: {},
+    errors: {},
+  };
+
+  results.reduce((result, current) => {
+    current.messages.forEach((msg) => {
+      if (msg.severity === 1) {
+        errorType.warnings[msg.ruleId] = errorType.warnings[msg.ruleId] + 1 || 1
+      }
+      if (msg.severity === 2) {
+        errorType.errors[msg.ruleId] = errorType.errors[msg.ruleId] + 1 || 1
+      }
+    });
+    return result;
+  });
+
+  const reduceErrorCounts = (errorType) => Object.entries(errorType).sort((a, b) => b[1] - a[1])
+    .reduce((result, current) => result.concat([`${current[0]}: ${current[1]}`]), []).join('\n');
+
+  const warnings = reduceErrorCounts(errorType.warnings);
+  const errors = reduceErrorCounts(errorType.errors);
+
+  return `
+Errors:
+${'='.repeat(30)}
+${errors}
+${'\n'.repeat(4)}
+Warnings:
+${'='.repeat(30)}
+${warnings}`;
+};