feat: make abusing eslint-disable more difficult

This changeset adds `eslint-plugin-eslint-comments` and a [set of
rules](https://github.com/mysticatea/eslint-plugin-eslint-comments/blob/d2d21f2496232248370da851d7dbd634e2a37d87/lib/configs/recommended.js)
intended to help prevent abuse of `eslint-disable` comments and to provide
feedback when `eslint-disable`s can be removed.

Closes #204.

package.json

@@ -35,6 +35,7 @@
     "eslint-config-prettier": "^6.5.0",
     "eslint-config-problems": "^3.0.1",
     "eslint-plugin-babel": "^5.3.0",
+    "eslint-plugin-eslint-comments": "^3.1.2",
     "eslint-plugin-flowtype": "^3.13.0",
     "eslint-plugin-goodeggs": "file:.",
     "eslint-plugin-import": "^2.18.2",
@@ -57,6 +58,7 @@
     "eslint-config-prettier": "^6.5.0",
     "eslint-config-problems": "^3.0.1",
     "eslint-plugin-babel": "^5.3.0",
+    "eslint-plugin-eslint-comments": "^3.1.2",
     "eslint-plugin-flowtype": "^3.13.0",
     "eslint-plugin-import": "^2.18.2",
     "eslint-plugin-jest": "^23.0.3",

src/config/recommended.js

@@ -5,6 +5,8 @@ export default {
   plugins: [
     // https://github.com/babel/eslint-plugin-babel
     'babel',
+    // https://github.com/mysticatea/eslint-plugin-eslint-comments
+    'eslint-comments',
     // https://github.com/benmosher/eslint-plugin-import
     'import',
     // https://github.com/wix/eslint-plugin-lodash
@@ -19,6 +21,7 @@ export default {
     'eslint:recommended',
     // https://github.com/RyanZim/eslint-config-problems
     'problems',
+    'plugin:eslint-comments/recommended',
     'plugin:import/recommended',
     'plugin:lodash/recommended',
     'prettier',
@@ -29,6 +32,9 @@ export default {
     es6: true,
   },
   rules: {
+    /*
+     * Built-in rules
+     */
     eqeqeq: ['error', 'always', {null: 'ignore'}],
     'global-require': 'error',
     'guard-for-in': 'error',
@@ -63,7 +69,37 @@ export default {
     'operator-assignment': ['error', 'always'],
     'spaced-comment': ['error', 'always'],
 
-    // eslint-plugin-import
+    /*
+     * eslint-plugin-eslint-comments
+     */
+    // Allow `eslint-disable`s at the top of a file, but prevent users from forgetting to close an
+    // `eslint-disable` in the middle of a file. We should consider whether or not we actually want
+    // to allow whole-file `eslint-disable`s, but in practice we do it frequently for somtimes-
+    // legitimate reasons.
+    'eslint-comments/disable-enable-pair': ['error', {allowWholeFile: true}],
+    // Restrict the use of eslint directives in files. ESLint rules should be specified in the
+    // ESLint configuration as much as possible; this prevents, for example, users from changing
+    // rules for a specific file (e.g. `/* eslint no-undef: warn */`), but allows users to disable
+    // rules for a region of a file.
+    'eslint-comments/no-use': [
+      'error',
+      {
+        allow: [
+          'eslint-disable',
+          'eslint-disable-line',
+          'eslint-disable-next-line',
+          'eslint-enable',
+          // Eventually, we should force users to specify all globals in their project's ESLint
+          // configuration file(s).
+          'global',
+          'globals',
+        ],
+      },
+    ],
+
+    /*
+     * eslint-plugin-import
+     */
     'import/first': 'error',
     'import/newline-after-import': 'error',
     'import/no-absolute-path': 'error',
@@ -82,7 +118,9 @@ export default {
       },
     ],
 
-    // eslint-plugin-lodash
+    /*
+     * eslint-plugin-lodash
+     */
     'lodash/chaining': ['error', 'always', 2],
     'lodash/import-scope': ['error', 'full'],
     'lodash/matches-prop-shorthand': ['error', 'never'],
@@ -98,9 +136,6 @@ export default {
     'lodash/prefer-thru': 'off',
     'lodash/preferred-alias': 'error',
     'lodash/prop-shorthand': ['error', 'never'],
-
-    // eslint-plugin-unicorn
-    'unicorn/no-abusive-eslint-disable': 'error',
   },
   overrides: [
     // Configuration files (e.g. webpack.config.js) that are *not* transpiled through Babel.

yarn.lock

@@ -1785,14 +1785,21 @@ eslint-plugin-babel@^5.3.0:
   dependencies:
     eslint-rule-composer "^0.3.0"
 
+eslint-plugin-eslint-comments@^3.1.2:
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-eslint-comments/-/eslint-plugin-eslint-comments-3.1.2.tgz#4ef6c488dbe06aa1627fea107b3e5d059fc8a395"
+  dependencies:
+    escape-string-regexp "^1.0.5"
+    ignore "^5.0.5"
+
 eslint-plugin-flowtype@^3.13.0:
   version "3.13.0"
   resolved "https://registry.npmjs.org/eslint-plugin-flowtype/-/eslint-plugin-flowtype-3.13.0.tgz#e241ebd39c0ce519345a3f074ec1ebde4cf80f2c"
   dependencies:
     lodash "^4.17.15"
 
 "eslint-plugin-goodeggs@file:./.":
-  version "8.0.0-beta.7"
+  version "8.0.0-beta.9"
   dependencies:
     "@goodeggs/prettier-config" "^1.0.0"
 
@@ -2403,6 +2410,10 @@ ignore@^4.0.6:
   version "4.0.6"
   resolved "https://registry.npmjs.org/ignore/-/ignore-4.0.6.tgz#750e3db5862087b4737ebac8207ffd1ef27b25fc"
 
+ignore@^5.0.5:
+  version "5.1.4"
+  resolved "https://registry.yarnpkg.com/ignore/-/ignore-5.1.4.tgz#84b7b3dbe64552b6ef0eca99f6743dbec6d97adf"
+
 import-fresh@^3.0.0:
   version "3.0.0"
   resolved "https://registry.npmjs.org/import-fresh/-/import-fresh-3.0.0.tgz#a3d897f420cab0e671236897f75bc14b4885c390"