diff --git a/gulpfile.js b/gulpfile.js
index 81bcd118..ea48569c 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -67,7 +67,9 @@ const javascripts = {
     // - deliver it in one bundle
     // - allow it to run in browsers without support for JS Modules
     return rollup.rollup({
-      input: paths.src + 'javascripts/govuk-frontend-details-init.mjs',
+      input: {
+        'govuk-frontend-details': paths.src + 'javascripts/govuk-frontend-details-init.mjs'
+      },
       plugins: [
         // determine module entry points from either 'module' or 'main' fields in package.json
         rollupPluginNodeResolve.nodeResolve({
@@ -97,7 +99,9 @@ const javascripts = {
     // - deliver it in one bundle
     // - allow it to run in browsers without support for JS Modules
     return rollup.rollup({
-      input: paths.src + 'javascripts/sharing-button-init.mjs',
+      input: {
+        'sharing-button': paths.src + 'javascripts/sharing-button-init.mjs'
+      },
       plugins: [
         // determine module entry points from either 'module' or 'main' fields in package.json
         rollupPluginNodeResolve.nodeResolve({
@@ -127,7 +131,9 @@ const javascripts = {
     // - deliver it in one bundle
     // - allow it to run in browsers without support for JS Modules
     return rollup.rollup({
-      input: paths.src + 'javascripts/relative-dates-init.mjs',
+      input: {
+        'relative-dates': paths.src + 'javascripts/relative-dates-init.mjs'
+      },
       plugins: [
         // determine module entry points from either 'module' or 'main' fields in package.json
         rollupPluginNodeResolve.nodeResolve({
diff --git a/src/alert.html b/src/alert.html
index f71f47a8..85354d91 100644
--- a/src/alert.html
+++ b/src/alert.html
@@ -92,7 +92,7 @@ <h2 class="govuk-heading-s">
 {% endblock %}
 
 {% block bodyEnd %}
-  <script type="text/javascript" src="{{ '/alerts/assets/javascripts/govuk-frontend-details-init.js' | file_fingerprint }}"></script>
-  <!--[if gt IE 8]><!--><script type="text/javascript" src="{{ '/alerts/assets/javascripts/sharing-button-init.js' | file_fingerprint }}"></script><!--<![endif]-->
+  <script type="text/javascript" src="{{ '/alerts/assets/javascripts/govuk-frontend-details.js' | file_fingerprint }}"></script>
+  <!--[if gt IE 8]><!--><script type="text/javascript" src="{{ '/alerts/assets/javascripts/sharing-button.js' | file_fingerprint }}"></script><!--<![endif]-->
 
 {% endblock %}
diff --git a/src/current-alerts.html b/src/current-alerts.html
index c205ebd5..dc745b29 100644
--- a/src/current-alerts.html
+++ b/src/current-alerts.html
@@ -15,7 +15,7 @@
 {% endblock %}
 
 {% block prefetch %}
-  <link rel="prefetch" href="{{ '/alerts/assets/javascripts/govuk-frontend-details-init.js' | file_fingerprint }}" />
+  <link rel="prefetch" href="{{ '/alerts/assets/javascripts/govuk-frontend-details.js' | file_fingerprint }}" />
 {% endblock %}
 
 {% block pageTitleCurrent -%}
diff --git a/src/index.html b/src/index.html
index e5ceb95a..75e36e6b 100644
--- a/src/index.html
+++ b/src/index.html
@@ -17,7 +17,7 @@
 {% endblock %}
 
 {% block prefetch %}
-  <link rel="prefetch" href="{{ '/alerts/assets/javascripts/govuk-frontend-details-init.js' | file_fingerprint }}" />
+  <link rel="prefetch" href="{{ '/alerts/assets/javascripts/govuk-frontend-details.js' | file_fingerprint }}" />
 {% endblock %}
 
 {% block pageTitleCurrent -%}
@@ -106,5 +106,5 @@ <h2 class="govuk-heading-l">How it works</h2>
 {% endblock %}
 
 {% block bodyEnd %}
-  <script async type="text/javascript" src="{{ '/alerts/assets/javascripts/relative-dates-init.js' | file_fingerprint }}"></script>
+  <script async type="text/javascript" src="{{ '/alerts/assets/javascripts/relative-dates.js' | file_fingerprint }}"></script>
 {% endblock %}
diff --git a/src/opt-out.html b/src/opt-out.html
index b0148fe7..2d02c77d 100644
--- a/src/opt-out.html
+++ b/src/opt-out.html
@@ -97,5 +97,5 @@ <h2 class="govuk-heading-l">
 {% endblock %}
 
 {% block bodyEnd %}
-  <script type="text/javascript" src="{{ '/alerts/assets/javascripts/govuk-frontend-details-init.js' | file_fingerprint }}"></script>
+  <script type="text/javascript" src="{{ '/alerts/assets/javascripts/govuk-frontend-details.js' | file_fingerprint }}"></script>
 {% endblock %}
diff --git a/src/past-alerts.html b/src/past-alerts.html
index 15a0eeec..bb650120 100644
--- a/src/past-alerts.html
+++ b/src/past-alerts.html
@@ -15,7 +15,7 @@
 {% endblock %}
 
 {% block prefetch %}
-  <link rel="prefetch" href="{{ '/alerts/assets/javascripts/govuk-frontend-details-init.js' | file_fingerprint }}" />
+  <link rel="prefetch" href="{{ '/alerts/assets/javascripts/govuk-frontend-details.js' | file_fingerprint }}" />
 {% endblock %}
 
 {% block pageTitleCurrent -%}
diff --git a/src/when-you-get-an-alert.html b/src/when-you-get-an-alert.html
index 36aa479d..57cdce92 100644
--- a/src/when-you-get-an-alert.html
+++ b/src/when-you-get-an-alert.html
@@ -125,5 +125,5 @@ <h2 class="govuk-heading-m">
 {% endblock %}
 
 {% block bodyEnd %}
-  <script type="text/javascript" src="{{ '/alerts/assets/javascripts/govuk-frontend-details-init.js' | file_fingerprint }}"></script>
+  <script type="text/javascript" src="{{ '/alerts/assets/javascripts/govuk-frontend-details.js' | file_fingerprint }}"></script>
 {% endblock %}