Upgrade to Webpacker 6.0.

app/javascript/packs/application.js

@@ -1,5 +1,4 @@
 /* eslint no-console:0 */
-
 function importAll(r) {
   r.keys().forEach(r);
 }

app/javascript/src/javascripts/utility.js

@@ -114,7 +114,8 @@ Utility.regexp_escape = function(string) {
 }
 
 Utility.regexp_split = function(string) {
-  return [...new Set(String(string === null || string === undefined ? "" : string).match(/\S+/g))];
+  string ??= "";
+  return string.match(/\S+/g) ?? [];
 }
 
 $.fn.selectEnd = function() {

app/javascript/src/styles/base/030_links.scss

@@ -1,4 +1,4 @@
-@import "../../javascript/src/styles/base/000_vars.scss";
+@import "./000_vars.scss";
 
 a:link {
   color: var(--link-color);

app/javascript/src/styles/common/tables.scss

@@ -53,7 +53,7 @@ table.autofit {
   }
 }
 
-table.search {
+table.search, table.aligned-vertical {
   tr {
     height: 2em;
   }
@@ -70,9 +70,5 @@ table.search {
 }
 
 table.aligned-vertical {
-  @extend table.search;
-
-  tr {
-    height: 1.75em;
-  }
+  height: 1.75em;
 }