[eslint config] [*] [new] add eslint v5 support

Author: ljharb

.travis.yml

@@ -18,20 +18,37 @@ script:
 sudo: false
 env:
   matrix:
-    - 'TEST=true ESLINT=4 PACKAGE=eslint-config-airbnb'
+    - 'TEST=true ESLINT=5 PACKAGE=eslint-config-airbnb-base'
+    - 'TEST=true ESLINT=5 PACKAGE=eslint-config-airbnb'
     - 'TEST=true ESLINT=4 PACKAGE=eslint-config-airbnb-base'
+    - 'TEST=true ESLINT=4 PACKAGE=eslint-config-airbnb'
 matrix:
   fast_finish: true
   include:
     - node_js: "lts/*"
-      env: PREPUBLISH=true ESLINT=4 PACKAGE=eslint-config-airbnb
+      env: PREPUBLISH=true ESLINT=5 PACKAGE=eslint-config-airbnb-base
+    - node_js: "lts/*"
+      env: PREPUBLISH=true ESLINT=5 PACKAGE=eslint-config-airbnb
     - node_js: "lts/*"
       env: PREPUBLISH=true ESLINT=4 PACKAGE=eslint-config-airbnb-base
+    - node_js: "lts/*"
+      env: PREPUBLISH=true ESLINT=4 PACKAGE=eslint-config-airbnb
     - node_js: "lts/*"
       env: LINT=true
+  exclude:
+    - node_js: "5"
+      env: TEST=true ESLINT=5 PACKAGE=eslint-config-airbnb-base
+    - node_js: "5"
+      env: TEST=true ESLINT=5 PACKAGE=eslint-config-airbnb
+    - node_js: "4"
+      env: TEST=true ESLINT=5 PACKAGE=eslint-config-airbnb-base
+    - node_js: "4"
+      env: TEST=true ESLINT=5 PACKAGE=eslint-config-airbnb
   allow_failures:
     - node_js: "9"
     - node_js: "7"
     - node_js: "5"
-    - env: PREPUBLISH=true ESLINT=4 PACKAGE=eslint-config-airbnb
+    - env: PREPUBLISH=true ESLINT=5 PACKAGE=eslint-config-airbnb-base
+    - env: PREPUBLISH=true ESLINT=5 PACKAGE=eslint-config-airbnb
     - env: PREPUBLISH=true ESLINT=4 PACKAGE=eslint-config-airbnb-base
+    - env: PREPUBLISH=true ESLINT=4 PACKAGE=eslint-config-airbnb

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

@@ -56,15 +56,15 @@
     "babel-preset-airbnb": "^2.5.1",
     "babel-tape-runner": "^2.0.1",
     "editorconfig-tools": "^0.1.1",
-    "eslint": "^4.19.1",
+    "eslint": "^4.19.1 || ^5.0.1",
     "eslint-find-rules": "^3.3.1",
     "eslint-plugin-import": "^2.13.0",
     "in-publish": "^2.0.0",
     "safe-publish-latest": "^1.1.1",
     "tape": "^4.9.1"
   },
   "peerDependencies": {
-    "eslint": "^4.19.1",
+    "eslint": "^4.19.1 || ^5.0.1",
     "eslint-plugin-import": "^2.13.0"
   },
   "engines": {

packages/eslint-config-airbnb-base/rules/best-practices.js

@@ -42,6 +42,11 @@ module.exports = {
     // make sure for-in loops have an if statement
     'guard-for-in': 'error',
 
+    // enforce a maximum number of classes per file
+    // https://eslint.org/docs/rules/max-classes-per-file
+    // TODO: semver-major (eslint 5): enable
+    'max-classes-per-file': ['off', 1],
+
     // disallow the use of alert, confirm, and prompt
     'no-alert': 'warn',
 
@@ -243,7 +248,10 @@ module.exports = {
 
     // disallow self assignment
     // https://eslint.org/docs/rules/no-self-assign
-    'no-self-assign': 'error',
+    // TODO: semver-major: props -> true
+    'no-self-assign': ['error', {
+      props: false,
+    }],
 
     // disallow comparisons where both sides are exactly the same
     'no-self-compare': 'error',

packages/eslint-config-airbnb-base/rules/style.js

@@ -21,6 +21,7 @@ module.exports = {
     'brace-style': ['error', '1tbs', { allowSingleLine: true }],
 
     // require camel case names
+    // TODO: semver-major (eslint 5): add ignoreDestructuring: false option
     camelcase: ['error', { properties: 'never' }],
 
     // enforce or disallow capitalization of the first letter of a comment
@@ -83,6 +84,7 @@ module.exports = {
     // requires function names to match the name of the variable or property to which they are
     // assigned
     // https://eslint.org/docs/rules/func-name-matching
+    // TODO: semver-major (eslint 5): add considerPropertyDescriptor: true
     'func-name-matching': ['off', 'always', {
       includeCommonJSModuleExports: false
     }],
@@ -208,6 +210,15 @@ module.exports = {
       skipComments: true
     }],
 
+    // enforce a maximum function length
+    // https://eslint.org/docs/rules/max-lines-per-function
+    'max-lines-per-function': ['off', {
+      max: 50,
+      skipBlankLines: true,
+      skipComments: true,
+      IIFEs: true,
+    }],
+
     // specify the maximum depth callbacks can be nested
     'max-nested-callbacks': 'off',
 
@@ -416,6 +427,11 @@ module.exports = {
     // https://eslint.org/docs/rules/padding-line-between-statements
     'padding-line-between-statements': 'off',
 
+    // Prefer use of an object spread over Object.assign
+    // https://eslint.org/docs/rules/prefer-object-spread
+    // TODO: semver-major (eslint 5): enable
+    'prefer-object-spread': 'off',
+
     // require quotes around object literal property names
     // https://eslint.org/docs/rules/quote-props.html
     'quote-props': ['error', 'as-needed', { keywords: false, unnecessary: true, numbers: false }],

packages/eslint-config-airbnb/package.json

@@ -62,7 +62,7 @@
     "babel-preset-airbnb": "^2.5.1",
     "babel-tape-runner": "^2.0.1",
     "editorconfig-tools": "^0.1.1",
-    "eslint": "^4.19.1",
+    "eslint": "^4.19.1 || ^5.0.1",
     "eslint-find-rules": "^3.3.1",
     "eslint-plugin-import": "^2.13.0",
     "eslint-plugin-jsx-a11y": "^6.1.0",
@@ -73,7 +73,7 @@
     "tape": "^4.9.1"
   },
   "peerDependencies": {
-    "eslint": "^4.19.1",
+    "eslint": "^4.19.1 || ^5.0.1",
     "eslint-plugin-import": "^2.13.0",
     "eslint-plugin-jsx-a11y": "^6.1.0",
     "eslint-plugin-react": "^7.10.0"