Add more granular messages to SupportError

Co-authored-by: Brett Kyle <[email protected]> Co-authored-by: Colin Rotherham <[email protected]>
alphagov · Nov 24, 2023 · 845fe13 · 845fe13
1 parent 6b93b36
commit 845fe13
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/packages/govuk-frontend/src/govuk/errors/index.mjs b/packages/govuk-frontend/src/govuk/errors/index.mjs
@@ -34,9 +34,14 @@ export class SupportError extends GOVUKFrontendError {
    * @param {HTMLElement | null} [$scope] - HTML element `<body>` checked for browser support
    */
   constructor($scope = document.body) {
+    const supportMessage =
+      'noModule' in HTMLScriptElement.prototype
+        ? 'GOV.UK Frontend initialised without `<body class="govuk-frontend-supported">` from template `<script>` snippet'
+        : 'GOV.UK Frontend is not supported in this browser'
+
     super(
       $scope
-        ? 'GOV.UK Frontend is not supported in this browser'
+        ? supportMessage
         : 'GOV.UK Frontend initialised without `<script type="module">`'
     )
   }