diff --git a/changelog_unreleased/typescript/18652.md b/changelog_unreleased/typescript/18652.md
new file mode 100644
index 000000000..b57ff1f78
--- /dev/null
+++ b/changelog_unreleased/typescript/18652.md
@@ -0,0 +1,22 @@
+#### Fix inconsistent formatting of class superClass (#18652 by @fisker)
+
+<!-- prettier-ignore -->
+```tsx
+// Input
+class ALongLongLongLongLongLongLongLongLongLongLongLongClassName
+  extends foo.bar.Baz {}
+class ALongLongLongLongLongLongLongLongLongLongLongLongClassName
+  extends foo.bar.Baz! {}
+
+// Prettier stable
+class ALongLongLongLongLongLongLongLongLongLongLongLongClassName
+  extends foo.bar.Baz {}
+class ALongLongLongLongLongLongLongLongLongLongLongLongClassName extends (foo
+  .bar.Baz!) {}
+
+// Prettier main
+class ALongLongLongLongLongLongLongLongLongLongLongLongClassName
+  extends foo.bar.Baz {}
+class ALongLongLongLongLongLongLongLongLongLongLongLongClassName
+  extends (foo.bar.Baz!) {}
+```
diff --git a/src/language-js/parentheses/needs-parentheses.js b/src/language-js/parentheses/needs-parentheses.js
index c091aa8ce..99d047156 100644
--- a/src/language-js/parentheses/needs-parentheses.js
+++ b/src/language-js/parentheses/needs-parentheses.js
@@ -1243,6 +1243,7 @@ function isDecoratorMemberExpression(node) {
   if (isMemberExpression(node)) {
     return (
       !node.computed &&
+      // @ts-expect-error -- doesn't exists on `MemberExpression`
       !node.optional &&
       node.property.type === "Identifier" &&
       isDecoratorMemberExpression(node.object)
diff --git a/src/language-js/print/class.js b/src/language-js/print/class.js
index 8f84e9bb0..13b2f4290 100644
--- a/src/language-js/print/class.js
+++ b/src/language-js/print/class.js
@@ -168,6 +168,17 @@ function hasMultipleHeritage(node) {
   return count > 1;
 }
 
+function isMemberish(node) {
+  if (
+    node?.type === "ChainExpression" ||
+    node?.type === "TSNonNullExpression"
+  ) {
+    return isMemberish(node.expression);
+  }
+
+  return isMemberExpression(node);
+}
+
 /**
 @returns {boolean}
 */
@@ -187,7 +198,7 @@ function shouldPrintClassInGroupModeWithoutCache(path) {
       return false;
     }
 
-    return !node.superTypeArguments && isMemberExpression(node.superClass);
+    return !node.superTypeArguments && isMemberish(node.superClass);
   }
 
   const heritage =
diff --git a/src/language-js/print/ternary-old.js b/src/language-js/print/ternary-old.js
index e5bb4464d..d6d2ade93 100644
--- a/src/language-js/print/ternary-old.js
+++ b/src/language-js/print/ternary-old.js
@@ -146,10 +146,11 @@ function shouldExtraIndentForConditionalExpression(path) {
     const node = path.getParentNode(ancestorCount);
 
     if (
-      (node.type === "ChainExpression" && node.expression === child) ||
+      ((node.type === "ChainExpression" ||
+        node.type === "TSNonNullExpression") &&
+        node.expression === child) ||
       (isCallExpression(node) && node.callee === child) ||
-      (isMemberExpression(node) && node.object === child) ||
-      (node.type === "TSNonNullExpression" && node.expression === child)
+      (isMemberExpression(node) && node.object === child)
     ) {
       child = node;
       continue;
diff --git a/src/language-js/print/ternary.js b/src/language-js/print/ternary.js
index 8ebca3701..597a100d0 100644
--- a/src/language-js/print/ternary.js
+++ b/src/language-js/print/ternary.js
@@ -103,10 +103,11 @@ function shouldExtraIndentForConditionalExpression(path) {
     const node = path.getParentNode(ancestorCount);
 
     if (
-      (node.type === "ChainExpression" && node.expression === child) ||
+      ((node.type === "ChainExpression" ||
+        node.type === "TSNonNullExpression") &&
+        node.expression === child) ||
       (isCallExpression(node) && node.callee === child) ||
-      (isMemberExpression(node) && node.object === child) ||
-      (node.type === "TSNonNullExpression" && node.expression === child)
+      (isMemberExpression(node) && node.object === child)
     ) {
       child = node;
       continue;
diff --git a/src/language-js/utilities/index.js b/src/language-js/utilities/index.js
index 9d8323872..fc3658bc5 100644
--- a/src/language-js/utilities/index.js
+++ b/src/language-js/utilities/index.js
@@ -380,9 +380,10 @@ const isCallExpression = skipChainExpression(
   createTypeCheckFunction(["CallExpression", "OptionalCallExpression"]),
 );
 
-const isMemberExpression = skipChainExpression(
-  createTypeCheckFunction(["MemberExpression", "OptionalMemberExpression"]),
-);
+const isMemberExpression = createTypeCheckFunction([
+  "MemberExpression",
+  "OptionalMemberExpression",
+]);
 
 /**
  * Attempts to gauge the rough complexity of a node, for example
diff --git a/tests/format/typescript/class-and-interface/heritage-break/__snapshots__/format.test.js.snap b/tests/format/typescript/class-and-interface/heritage-break/__snapshots__/format.test.js.snap
index 4cae483f3..40638a481 100644
--- a/tests/format/typescript/class-and-interface/heritage-break/__snapshots__/format.test.js.snap
+++ b/tests/format/typescript/class-and-interface/heritage-break/__snapshots__/format.test.js.snap
@@ -15,6 +15,9 @@ class Short
 class A_long_long_long_long_long_long_long_long_name12
   extends eslint.Rule?.RuleModule {}
 
+class A_long_long_long_long_long_long_long_long_name12
+  extends eslint.Rule.RuleModule! {}
+
 interface A_long_long_long_long_long_long_long_long_name2
   extends eslint.Rule.RuleModule {}
 
@@ -34,6 +37,9 @@ class Short extends eslint.Rule.RuleModule {}
 class A_long_long_long_long_long_long_long_long_name12
   extends eslint.Rule?.RuleModule {}
 
+class A_long_long_long_long_long_long_long_long_name12
+  extends (eslint.Rule.RuleModule!) {}
+
 interface A_long_long_long_long_long_long_long_long_name2
   extends eslint.Rule.RuleModule {}
 
diff --git a/tests/format/typescript/class-and-interface/heritage-break/member-expression-like.ts b/tests/format/typescript/class-and-interface/heritage-break/member-expression-like.ts
index ed24d9c3f..895a50805 100644
--- a/tests/format/typescript/class-and-interface/heritage-break/member-expression-like.ts
+++ b/tests/format/typescript/class-and-interface/heritage-break/member-expression-like.ts
@@ -7,6 +7,9 @@ class Short
 class A_long_long_long_long_long_long_long_long_name12
   extends eslint.Rule?.RuleModule {}
 
+class A_long_long_long_long_long_long_long_long_name12
+  extends eslint.Rule.RuleModule! {}
+
 interface A_long_long_long_long_long_long_long_long_name2
   extends eslint.Rule.RuleModule {}