enable eslint no-else-return allowElseIf: false option

packages/core-js-compat/compat.js

@@ -19,7 +19,8 @@ function getModules(filter) {
   if (typeof filter == 'string') {
     if (has(entries, filter)) return entries[filter];
     return atLeastSomeModules(allModules.filter(it => it.startsWith(filter)), filter);
-  } else if (filter instanceof RegExp) return atLeastSomeModules(allModules.filter(it => filter.test(it)), filter);
+  }
+  if (filter instanceof RegExp) return atLeastSomeModules(allModules.filter(it => filter.test(it)), filter);
   throwInvalidFilter(filter);
 }
 

packages/core-js/modules/es.string.replace-all.js

@@ -35,11 +35,8 @@ $({ target: 'String', proto: true }, {
         if (!~indexOf(flags, 'g')) throw new $TypeError('`.replaceAll` does not allow non-global regexes');
       }
       replacer = getMethod(searchValue, REPLACE);
-      if (replacer) {
-        return call(replacer, searchValue, O, replaceValue);
-      } else if (IS_PURE && IS_REG_EXP) {
-        return replace(toString(O), searchValue, replaceValue);
-      }
+      if (replacer) return call(replacer, searchValue, O, replaceValue);
+      if (IS_PURE && IS_REG_EXP) return replace(toString(O), searchValue, replaceValue);
     }
     string = toString(O);
     searchString = toString(searchValue);

packages/core-js/modules/web.url.constructor.js

@@ -209,15 +209,19 @@ var findLongestZeroSequence = function (ipv6) {
 // https://url.spec.whatwg.org/#host-serializing
 var serializeHost = function (host) {
   var result, index, compress, ignore0;
+
   // ipv4
   if (typeof host == 'number') {
     result = [];
     for (index = 0; index < 4; index++) {
       unshift(result, host % 256);
       host = floor(host / 256);
-    } return join(result, '.');
+    }
+    return join(result, '.');
+  }
+
   // ipv6
-  } else if (typeof host == 'object') {
+  if (typeof host == 'object') {
     result = '';
     compress = findLongestZeroSequence(host);
     for (index = 0; index < 8; index++) {
@@ -232,7 +236,9 @@ var serializeHost = function (host) {
       }
     }
     return '[' + result + ']';
-  } return host;
+  }
+
+  return host;
 };
 
 var C0ControlPercentEncodeSet = {};

tests/eslint/eslint.config.js

@@ -172,7 +172,7 @@ const base = {
   // disallow deletion of variables
   'no-delete-var': ERROR,
   // disallow else after a return in an if
-  'no-else-return': ERROR,
+  'no-else-return': [ERROR, { allowElseIf: false }],
   // disallow empty statements
   'no-empty': ERROR,
   // disallow empty functions, except for standalone funcs/arrows