typescript-eslint · bradzacher · Jul 18, 2025 · Jul 10, 2025 · Jul 10, 2025 · Jul 10, 2025
diff --git a/...ression/TaggedTemplateExpression/fixtures/_error_/optional-nested-function-tag/fixture.ts b/...ression/TaggedTemplateExpression/fixtures/_error_/optional-nested-function-tag/fixture.ts
@@ -0,0 +1 @@
+a?.b()`...`
diff --git a/...eExpression/fixtures/_error_/optional-nested-function-tag/snapshots/1-TSESTree-Error.shot b/...eExpression/fixtures/_error_/optional-nested-function-tag/snapshots/1-TSESTree-Error.shot
diff --git a/...lateExpression/fixtures/_error_/optional-nested-function-tag/snapshots/2-Babel-Error.shot b/...lateExpression/fixtures/_error_/optional-nested-function-tag/snapshots/2-Babel-Error.shot
diff --git a/...Expression/fixtures/_error_/optional-nested-function-tag/snapshots/3-Alignment-Error.shot b/...Expression/fixtures/_error_/optional-nested-function-tag/snapshots/3-Alignment-Error.shot
diff --git a/...c/src/expression/TaggedTemplateExpression/fixtures/_error_/optional-nested-tag/fixture.ts b/...c/src/expression/TaggedTemplateExpression/fixtures/_error_/optional-nested-tag/fixture.ts
@@ -0,0 +1 @@
+a?.b.c`...`
diff --git a/...edTemplateExpression/fixtures/_error_/optional-nested-tag/snapshots/1-TSESTree-Error.shot b/...edTemplateExpression/fixtures/_error_/optional-nested-tag/snapshots/1-TSESTree-Error.shot
diff --git a/...aggedTemplateExpression/fixtures/_error_/optional-nested-tag/snapshots/2-Babel-Error.shot b/...aggedTemplateExpression/fixtures/_error_/optional-nested-tag/snapshots/2-Babel-Error.shot
diff --git a/...dTemplateExpression/fixtures/_error_/optional-nested-tag/snapshots/3-Alignment-Error.shot b/...dTemplateExpression/fixtures/_error_/optional-nested-tag/snapshots/3-Alignment-Error.shot
diff --git a/...ast-spec/src/expression/TaggedTemplateExpression/fixtures/_error_/optional-tag/fixture.ts b/...ast-spec/src/expression/TaggedTemplateExpression/fixtures/_error_/optional-tag/fixture.ts
@@ -0,0 +1 @@
+a?.b`...`
diff --git a/...on/TaggedTemplateExpression/fixtures/_error_/optional-tag/snapshots/1-TSESTree-Error.shot b/...on/TaggedTemplateExpression/fixtures/_error_/optional-tag/snapshots/1-TSESTree-Error.shot
diff --git a/...ssion/TaggedTemplateExpression/fixtures/_error_/optional-tag/snapshots/2-Babel-Error.shot b/...ssion/TaggedTemplateExpression/fixtures/_error_/optional-tag/snapshots/2-Babel-Error.shot
diff --git a/...n/TaggedTemplateExpression/fixtures/_error_/optional-tag/snapshots/3-Alignment-Error.shot b/...n/TaggedTemplateExpression/fixtures/_error_/optional-tag/snapshots/3-Alignment-Error.shot
diff --git a/packages/typescript-estree/src/convert.ts b/packages/typescript-estree/src/convert.ts
@@ -1917,7 +1917,13 @@ export class Converter {
         return result;
       }
 
-      case SyntaxKind.TaggedTemplateExpression:
+      case SyntaxKind.TaggedTemplateExpression: {
+        if (node.tag.flags & ts.NodeFlags.OptionalChain) {
+          this.#throwError(
+            node,
+            'Tagged template expressions are not permitted in an optional chain.',
+          );
+        }
         return this.createNode<TSESTree.TaggedTemplateExpression>(node, {
           type: AST_NODE_TYPES.TaggedTemplateExpression,
           quasi: this.convertChild(node.template),
@@ -1929,6 +1935,7 @@ export class Converter {
               node,
             ),
         });
+      }
 
       case SyntaxKind.TemplateHead:
       case SyntaxKind.TemplateMiddle: