diff --git a/core/.eslintrc.passing.json b/core/.eslintrc.passing.json
index 449ec7030895d3d66f8400d15ad4e1637982ecc2..3e526794834e86f70c3f06a170c90aa2619bd5ae 100644
--- a/core/.eslintrc.passing.json
+++ b/core/.eslintrc.passing.json
@@ -11,7 +11,6 @@
     "operator-linebreak": "off",
     "react/no-this-in-sfc": "off",
     "react/destructuring-assignment": "off",
-    "implicit-arrow-linebreak": "off",
     "import/named": "off"
   }
 }
diff --git a/core/misc/form.es6.js b/core/misc/form.es6.js
index 9afc7a11adc5441897078eaa822e0c290ade6933..ac5903957516d24129860e7c8e973ccd290590d1 100644
--- a/core/misc/form.es6.js
+++ b/core/misc/form.es6.js
@@ -154,10 +154,11 @@
    *   Array of IDs for form fields.
    */
   function fieldsList(form) {
-    const $fieldList = $(form).find('[name]').map((index, element) =>
+    const $fieldList = $(form).find('[name]').map(
       // We use id to avoid name duplicates on radio fields and filter out
       // elements with a name but no id.
-      element.getAttribute('id'));
+      (index, element) => element.getAttribute('id'),
+    );
     // Return a true array.
     return $.makeArray($fieldList);
   }
diff --git a/core/modules/block/js/block.es6.js b/core/modules/block/js/block.es6.js
index 1bc5bd3a12fc71c28b9ed1ba1c20b05f7bf60e89..7bdbab0979a21062e54b3fbf6fe838d74c94fb95 100644
--- a/core/modules/block/js/block.es6.js
+++ b/core/modules/block/js/block.es6.js
@@ -136,13 +136,17 @@
         // Calculate minimum weight.
         let weight = -Math.round(table.find('.draggable').length / 2);
         // Update the block weights.
-        table.find(`.region-${region}-message`).nextUntil('.region-title')
-          .find('select.block-weight').val(() =>
+        table
+          .find(`.region-${region}-message`)
+          .nextUntil('.region-title')
+          .find('select.block-weight')
+          .val(
             // Increment the weight before assigning it to prevent using the
             // absolute minimum available weight. This way we always have an
             // unused upper and lower bound, which makes manually setting the
             // weights easier for users who prefer to do it that way.
-            ++weight);
+            () => ++weight,
+          );
       }
 
       const table = $('#blocks');