[BREAKING CHANGE] Upgrade ESLint to v6

config/eslintrc_core.js

@@ -1,5 +1,5 @@
 // XXX: To uniform the style of an object literals, we enable `quote-props`
-/*eslint quote-props: [2, "always"] no-magic-numbers: 0 */
+/* eslint quote-props: ['error', "always"] no-magic-numbers: 0 */
 
 'use strict';
 
@@ -55,7 +55,7 @@ module.exports = {
         // So we regard this rule as meaningless actually and disable this.
         'require-atomic-updates ': 0, // https://eslint.org/docs/rules/require-atomic-updates
         'use-isnan': 2, // Use `Number.isNaN`
-        'valid-typeof': [1, {'requireStringLiterals': true}],
+        'valid-typeof': [1, { 'requireStringLiterals': true }],
 
         // Best Practices
         'accessor-pairs': 0, // Allow only getter or setter to define a "read-only" or "write-only" object
@@ -116,7 +116,7 @@ module.exports = {
             'props': true
         }],
         'no-proto': 2,
-        'no-redeclare': 2,
+        'no-redeclare': ['error', { 'builtinGlobals': true }],
         'no-restricted-properties': 0, // https://eslint.org/docs/rules/no-restricted-properties
         'no-return-assign': 2, // This is a problem for readability.
         'no-return-await': 1, // Warn. Because this is not a serious problem which is same degree with `no-return-assign`.
@@ -180,7 +180,7 @@ module.exports = {
         'init-declarations': 'off',
         'no-delete-var': 2, // In a general case, we don't have to do this.
         'no-label-var': 2,
-        'no-restricted-globals' : [2, // https://eslint.org/docs/rules/no-restricted-globals
+        'no-restricted-globals': [2, // https://eslint.org/docs/rules/no-restricted-globals
             'name', 'top', 'event'
         ],
         'no-shadow': 0,
@@ -256,6 +256,8 @@ module.exports = {
             // but it would be good to allow both forms of declaration/expression.
             'allowArrowFunctions': true,
         }],
+        // Strictly, this should be handled by the formatter.
+        'function-paren-newline': ['error', 'multiline'],
         'id-blacklist': 0, // https://eslint.org/docs/rules/id-blacklist
         'id-length': 0, // https://eslint.org/docs/rules/id-length
         'id-match': 0, // https://eslint.org/docs/rules/id-match
@@ -333,7 +335,7 @@ module.exports = {
         'nonblock-statement-body-position': 0, // https://eslint.org/docs/rules/nonblock-statement-body-position
         'object-curly-newline': 0, // Just case by case! https://eslint.org/docs/rules/object-curly-newline
         'object-curly-spacing': 0, // https://eslint.org/docs/rules/object-curly-spacing
-        'object-property-newline' : 0, // Disable to allow many properties into single line.
+        'object-property-newline': 0, // Disable to allow many properties into single line.
         'one-var': [2, 'never'], // https://eslint.org/docs/rules/one-var
         'one-var-declaration-per-line': 1, // https://eslint.org/docs/rules/one-var-declaration-per-line
         'operator-assignment': 0, // Unlike `i++` or `++i`, this is not a problem
@@ -360,7 +362,7 @@ module.exports = {
         }],
         'quote-props': 0, // `bar-foo` without quote will be parse error if we disable this rules.
         'semi': [2, 'always'], // Enfoce semicolon.
-        'semi-spacing':[2, { // Ban a space char before semicolon.
+        'semi-spacing': [2, { // Ban a space char before semicolon.
             'before': false,
             'after': true
         }],

config/eslintrc_import.js

@@ -1,5 +1,5 @@
 // XXX: To uniform the style of an object literals, we enable `quote-props`
-/*eslint-enable quote-props: [2, "always"], no-magic-numbers: 0 */
+/*eslint quote-props: ['error', 'always'], no-magic-numbers: 0 */
 
 'use strict';
 
@@ -9,7 +9,7 @@
  *  or by chaning Node.js ES Module support.
  */
 
-/* eslint-enable sort-keys: 'error' */
+/* eslint sort-keys: 'error' */
 const possibleErrors = {
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/default.md
     'import/default': 'error',
@@ -136,14 +136,16 @@ const styleguide = {
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-default-export.md
     // default export is hard to find a usage of symbols.
     'import/no-default-export': 'error',
-    'import/no-named-export': 'off', // This is inverse of `no-default-export`.
 
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-duplicates.md
     'import/no-duplicates': 'warn',
 
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-named-default.md
     'import/no-named-default': 'off',
 
+    // This is inverse of `no-default-export`.
+    'import/no-named-export': 'off',
+
     // https://github.com/benmosher/eslint-plugin-import/blob/master/docs/rules/no-namespace.md
     'import/no-namespace': 'off',
 

config/eslintrc_node.js

@@ -1,5 +1,5 @@
 // XXX: To uniform the style of an object literals, we enable `quote-props`
-/*eslint quote-props: [2, "always"] no-magic-numbers: 0 */
+/* eslint quote-props: ['error', "always"] no-magic-numbers: 'off' */
 
 'use strict';
 

config/eslintrc_react.js

@@ -1,5 +1,5 @@
 // XXX: To uniform the style of an object literals, we enable `quote-props`
-/*eslint quote-props: [2, "always"] no-magic-numbers: 0 */
+/* eslint quote-props: ['error', "always"] no-magic-numbers: 'off' */
 
 'use strict';
 

config/eslintrc_react_hooks.js

@@ -1,5 +1,5 @@
 // XXX: To uniform the style of an object literals, we enable `quote-props`
-/*eslint quote-props: [2, "always"] no-magic-numbers: 0 */
+/* eslint quote-props: ['error', "always"] no-magic-numbers: 'off' */
 
 'use strict';
 

config/eslintrc_typescript.js

@@ -1,5 +1,5 @@
 // XXX: To uniform the style of an object literals, we enable `quote-props`
-/*eslint quote-props: [2, "always"] no-magic-numbers: 0 */
+/* eslint quote-props: ['error', "always"] no-magic-numbers: 'off' */
 
 'use strict';
 

config/eslintrc_typescript_react.js

@@ -1,5 +1,5 @@
 // XXX: To uniform the style of an object literals, we enable `quote-props`
-/*eslint quote-props: [2, "always"] no-magic-numbers: 0 */
+/* eslint quote-props: ['error', "always"] no-magic-numbers: 'off' */
 
 'use strict';
 

package.json

@@ -19,7 +19,7 @@
   },
   "homepage": "https://github.com/cats-oss/eslint-config-abema",
   "peerDependencies": {
-    "eslint": "^5.15.3"
+    "eslint": "^6.0.0"
   },
   "optionalDependencies": {
     "@typescript-eslint/eslint-plugin": "^1.11.0",
@@ -31,7 +31,7 @@
   "devDependencies": {
     "@typescript-eslint/eslint-plugin": "^1.11.0",
     "@typescript-eslint/parser": "^1.11.0",
-    "eslint": "^5.16.0",
+    "eslint": "^6.0.0",
     "eslint-plugin-import": "^2.17.3",
     "eslint-plugin-markdown": "^1.0.0",
     "eslint-plugin-node": "^9.1.0",

test/import/.eslintrc.js

@@ -1,5 +1,5 @@
 // XXX: To uniform the style of an object literals, we enable `quote-props`
-/*eslint quote-props: [2, "always"] no-magic-numbers: 0 */
+/* eslint quote-props: ['error', "always"] no-magic-numbers: 'off' */
 
 // eslint-disable-next-line strict
 'use strict';

test/react/.eslintrc.js

@@ -1,5 +1,5 @@
 // XXX: To uniform the style of an object literals, we enable `quote-props`
-/*eslint quote-props: [2, "always"] no-magic-numbers: 0 */
+/* eslint quote-props: ['error', "always"] no-magic-numbers: 'off' */
 
 'use strict';
 

test/typescript/.eslintrc.js

@@ -1,5 +1,5 @@
 // XXX: To uniform the style of an object literals, we enable `quote-props`
-/*eslint quote-props: [2, "always"] no-magic-numbers: 0 */
+/* eslint quote-props: ['error', "always"] no-magic-numbers: 'off' */
 /* eslint-env node */
 
 // eslint-disable-next-line strict