Fix CI: shims.cjs path and using keyword

- Update vitest.config.mjs to reference shims.cjs instead of shims.js
- Convert using declarations to const in grammar.spec.ts (Prettier 2.x
  doesn't support ES2024 explicit resource management syntax)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: charlespwd

packages/liquid-html-parser/src/grammar.spec.ts

@@ -101,7 +101,7 @@ describe('Unit: liquidHtmlGrammar', () => {
         expectMatchSucceeded('<6h>').to.be.false;
 
         function expectMatchSucceeded(text: string) {
-          using match = grammar.LiquidHTML.match(text, 'Node');
+          const match = grammar.LiquidHTML.match(text, 'Node');
           return expect(match.succeeded(), text);
         }
       });
@@ -129,7 +129,7 @@ describe('Unit: liquidHtmlGrammar', () => {
         `).to.be.true;
 
         function expectMatchSucceeded(text: string) {
-          using match = grammar.LiquidStatement.match(text.trimStart(), 'Node');
+          const match = grammar.LiquidStatement.match(text.trimStart(), 'Node');
           return expect(match.succeeded(), text);
         }
       });
@@ -156,7 +156,7 @@ describe('Unit: liquidHtmlGrammar', () => {
     });
 
     function expectMatchSucceeded(text: string) {
-      using match = placeholderGrammars.LiquidHTML.match(text.trimStart(), 'Node');
+      const match = placeholderGrammars.LiquidHTML.match(text.trimStart(), 'Node');
       return expect(match.succeeded(), text);
     }
   });

packages/prettier-plugin-liquid/vitest.config.mjs

@@ -13,6 +13,6 @@ export default defineConfig({
       },
     },
     globalSetup: ['./src/test/test-setup.js'],
-    setupFiles: ['../liquid-html-parser/build/shims.js'],
+    setupFiles: ['../liquid-html-parser/build/shims.cjs'],
   },
 });