Issue 4993 - Apply operator-linebreak ESLint rule consistently

eslint-config-eyeo/index.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2017 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 66 matching lines @@
     "no-var": "error",
     "no-warning-comments": "error",
     "no-whitespace-before-property": "error",
     "no-with": "error",
     "object-curly-spacing": "error",
     "object-shorthand": ["error", "always", {
       avoidExplicitReturnArrows: true
     }],
     "one-var": ["error", "never"],
     "operator-assignment": "error",
-    "operator-linebreak": "error",
+    "operator-linebreak": ["error", "after"],
     "padded-blocks": ["error", "never"],
     "prefer-arrow-callback": "error",
     "prefer-destructuring": ["error", {array: false}],
     "prefer-numeric-literals": "error",
     "prefer-rest-params": "error",
     "prefer-spread": "error",
     "quote-props": ["error", "consistent-as-needed"],
     "quotes": ["error", "double", {avoidEscape: true}],
     "radix": "error",
     "rest-spread-spacing": "error",
     "semi": "error",
     "semi-spacing": "error",
     "space-before-function-paren": ["error", "never"],
     "space-in-parens": "error",
     "space-infix-ops": "error",
     "space-unary-ops": "error",
     "spaced-comment": "error",
     "strict": ["error", "global"],
     "valid-jsdoc": ["error", {
       requireParamDescription: false,
       requireReturn: false,
       requireReturnDescription: false
     }],
     "yield-star-spacing": "error",
     "yoda": "error"
   }
 };