[eslint config] [base] [breaking] lines-between-class-members: set to “always”

Author: ljharb

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

@@ -155,8 +155,7 @@ module.exports = {
 
     // require or disallow an empty line between class members
     // https://eslint.org/docs/rules/lines-between-class-members
-    // TODO: semver-major: enable
-    'lines-between-class-members': ['off', 'always', { exceptAfterSingleLine: false }],
+    'lines-between-class-members': ['error', 'always', { exceptAfterSingleLine: false }],
 
     // enforces empty lines around comments
     'lines-around-comment': 'off',