preview - don't set options as a const as it would be available in the global scope

Author: cderv

news/changelog-1.7.md

@@ -179,3 +179,4 @@ All changes included in 1.7:
 - ([#12369](https://github.com/quarto-dev/quarto-cli/pull/12369)): `quarto preview` correctly throws a YAML validation error when a `format` key does not conform.
 - ([#12459](https://github.com/quarto-dev/quarto-cli/pull/12459)): Add `.page-inset-*` classes to completions.
 - ([#12492](https://github.com/quarto-dev/quarto-cli/pull/12492)): Improve shortcode extension template with new parameters and a link to docs.
+- ([#12513](https://github.com/quarto-dev/quarto-cli/issues/12513)): Fix an issue with `quarto preview` when using **DiagrammeR** R package for Graphiz diagram.

src/resources/preview/quarto-preview.html

@@ -1,15 +1,19 @@
-
-<script>window.backupDefine = window.define; window.define = undefined;</script>
+<script>
+  window.backupDefine = window.define;
+  window.define = undefined;
+</script>
 <script type="text/javascript" src="quarto-preview.js"></script>
-<script>window.define = window.backupDefine; window.backupDefine = undefined;</script>
+<script>
+  window.define = window.backupDefine;
+  window.backupDefine = undefined;
+</script>
 <script type="text/javascript">
-  const options = {
-    origin: "<%- origin %>",
-    search: "<%- search %>",
-    inputFile: "<%- inputFile %>",
-    isPresentation: <%= isPresentation %>
-  }
   document.addEventListener("DOMContentLoaded", function () {
-    window.QuartoPreview.init(options);
-  });
+    window.QuartoPreview.init({
+      origin: "<%- origin %>",
+      search: "<%- search %>",
+      inputFile: "<%- inputFile %>",
+      isPresentation: <%= isPresentation %>
+    });
+  })
 </script>