fix(compiler): parsing of an empty template literal interpolation

hawkgs · mattrbeck · commit da52137724b8 · 2026-07-09T09:56:40.000-07:00
Even if we have an `EmptyExpr`, add that expression to the expressions array when a literal is parsed. The lack of the expression results in a discrepancy in the sizes of the `elements` and the `expressions` arrays of a `TemplateLiteral`, that result in an error when we visit that same literal due to the missing expression. Fixes #69699
diff --git a/packages/compiler/src/expression_parser/parser.ts b/packages/compiler/src/expression_parser/parser.ts
@@ -1646,9 +1646,8 @@ class _ParseAST {
         const expression = this.parsePipe();
         if (expression instanceof EmptyExpr) {
           this.error('Template literal interpolation cannot be empty');
-        } else {
-          expressions.push(expression);
         }
+        expressions.push(expression);
         this.rbracesExpected--;
       } else {
         this.advance();
diff --git a/packages/compiler/test/expression_parser/parser_spec.ts b/packages/compiler/test/expression_parser/parser_spec.ts
@@ -529,6 +529,9 @@ describe('parser', () => {
       });
 
       it('should report error if interpolation is empty', () => {
+        // Even though an empty interpolation should result in an error,
+        // we should retain the expression.
+        checkBinding('`hello ${}`');
         expectBindingError('`hello ${}`', 'Template literal interpolation cannot be empty');
       });
 
