From 003893bc94a6ffe008bf7cadf021bdae33431071 Mon Sep 17 00:00:00 2001
From: Colin Rotherham <work@colinr.com>
Date: Wed, 21 Feb 2024 21:44:21 +0000
Subject: [PATCH] Add GOV.UK Frontend path locals to template previews

Fixes https://github.com/alphagov/govuk-prototype-kit/issues/2392
---
 lib/manage-prototype-handlers.js | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/lib/manage-prototype-handlers.js b/lib/manage-prototype-handlers.js
index bfd51f90fd..6ffc0e7f48 100644
--- a/lib/manage-prototype-handlers.js
+++ b/lib/manage-prototype-handlers.js
@@ -282,19 +282,23 @@ function locateTemplateConfig (req) {
   }
 }
 
-function getTemplatesViewHandler (req, res) {
-  const model = {
-    pluginConfig: plugins.getAppConfig({ scripts: prototypeAppScripts }),
-    serviceName: 'Service name goes here'
-  }
+function getTemplatesViewHandler(req, res) {
   const templateConfig = locateTemplateConfig(req)
 
   // Nunjucks environment for template previews uses `getAppViews()` to
   // add plugins including GOV.UK Frontend views via project package
   const nunjucksAppEnv = nunjucksConfiguration.getNunjucksAppEnv(appViews)
 
+  // Use GOV.UK Frontend paths from Express.js locals
+  const { govukFrontend, govukFrontendInternal } = req.app.locals
+
   if (templateConfig) {
-    res.send(nunjucksAppEnv.render(templateConfig.path, model))
+    res.send(nunjucksAppEnv.render(templateConfig.path, {
+      govukFrontend,
+      govukFrontendInternal,
+      pluginConfig: plugins.getAppConfig({ scripts: prototypeAppScripts }),
+      serviceName: 'Service name goes here'
+    }))
   } else {
     res.status(404).send('Template not found.')
   }