diff --git a/docs/contributing/coding-standards/js.md b/docs/contributing/coding-standards/js.md
index 13b1e20c90..06931b7bdf 100644
--- a/docs/contributing/coding-standards/js.md
+++ b/docs/contributing/coding-standards/js.md
@@ -15,6 +15,8 @@ component
 ```mjs
 /**
  * Component name
+ *
+ * @preserve
  */
 export class Example {
   /**
diff --git a/packages/govuk-frontend/src/govuk/components/accordion/accordion.mjs b/packages/govuk-frontend/src/govuk/components/accordion/accordion.mjs
index 4123160d32..378cd09a77 100644
--- a/packages/govuk-frontend/src/govuk/components/accordion/accordion.mjs
+++ b/packages/govuk-frontend/src/govuk/components/accordion/accordion.mjs
@@ -13,6 +13,8 @@ import { I18n } from '../../i18n.mjs'
  *
  * The state of each section is saved to the DOM via the `aria-expanded`
  * attribute, which also provides accessibility.
+ *
+ * @preserve
  */
 export class Accordion {
   /** @private */
diff --git a/packages/govuk-frontend/src/govuk/components/button/button.mjs b/packages/govuk-frontend/src/govuk/components/button/button.mjs
index b1204dbfc2..45d6b88e8c 100644
--- a/packages/govuk-frontend/src/govuk/components/button/button.mjs
+++ b/packages/govuk-frontend/src/govuk/components/button/button.mjs
@@ -6,6 +6,8 @@ const DEBOUNCE_TIMEOUT_IN_SECONDS = 1
 
 /**
  * JavaScript enhancements for the Button component
+ *
+ * @preserve
  */
 export class Button {
   /** @private */
@@ -24,7 +26,6 @@ export class Button {
   debounceFormSubmitTimer = null
 
   /**
-   *
    * @param {Element} $module - HTML element to use for button
    * @param {ButtonConfig} [config] - Button config
    */
diff --git a/packages/govuk-frontend/src/govuk/components/character-count/character-count.mjs b/packages/govuk-frontend/src/govuk/components/character-count/character-count.mjs
index 3e4b46c4f5..f3b0e3f854 100644
--- a/packages/govuk-frontend/src/govuk/components/character-count/character-count.mjs
+++ b/packages/govuk-frontend/src/govuk/components/character-count/character-count.mjs
@@ -12,6 +12,8 @@ import { I18n } from '../../i18n.mjs'
  *
  * You can configure the message to only appear after a certain percentage
  * of the available characters/words has been entered.
+ *
+ * @preserve
  */
 export class CharacterCount {
   /** @private */
diff --git a/packages/govuk-frontend/src/govuk/components/checkboxes/checkboxes.mjs b/packages/govuk-frontend/src/govuk/components/checkboxes/checkboxes.mjs
index 2ceb333905..4b9210995b 100644
--- a/packages/govuk-frontend/src/govuk/components/checkboxes/checkboxes.mjs
+++ b/packages/govuk-frontend/src/govuk/components/checkboxes/checkboxes.mjs
@@ -1,5 +1,7 @@
 /**
  * Checkboxes component
+ *
+ * @preserve
  */
 export class Checkboxes {
   /** @private */
diff --git a/packages/govuk-frontend/src/govuk/components/error-summary/error-summary.mjs b/packages/govuk-frontend/src/govuk/components/error-summary/error-summary.mjs
index db034725e7..250e1ad639 100644
--- a/packages/govuk-frontend/src/govuk/components/error-summary/error-summary.mjs
+++ b/packages/govuk-frontend/src/govuk/components/error-summary/error-summary.mjs
@@ -5,6 +5,8 @@ import { normaliseDataset } from '../../common/normalise-dataset.mjs'
  * Error summary component
  *
  * Takes focus on initialisation for accessible announcement, unless disabled in configuration.
+ *
+ * @preserve
  */
 export class ErrorSummary {
   /** @private */
@@ -17,7 +19,6 @@ export class ErrorSummary {
   config
 
   /**
-   *
    * @param {Element} $module - HTML element to use for error summary
    * @param {ErrorSummaryConfig} [config] - Error summary config
    */
diff --git a/packages/govuk-frontend/src/govuk/components/exit-this-page/exit-this-page.mjs b/packages/govuk-frontend/src/govuk/components/exit-this-page/exit-this-page.mjs
index 09e25ab51a..79771ce3d9 100644
--- a/packages/govuk-frontend/src/govuk/components/exit-this-page/exit-this-page.mjs
+++ b/packages/govuk-frontend/src/govuk/components/exit-this-page/exit-this-page.mjs
@@ -4,6 +4,8 @@ import { I18n } from '../../i18n.mjs'
 
 /**
  * Exit This Page component
+ *
+ * @preserve
  */
 export class ExitThisPage {
   /** @private */
diff --git a/packages/govuk-frontend/src/govuk/components/header/header.mjs b/packages/govuk-frontend/src/govuk/components/header/header.mjs
index 13d692ad48..8d667192ca 100644
--- a/packages/govuk-frontend/src/govuk/components/header/header.mjs
+++ b/packages/govuk-frontend/src/govuk/components/header/header.mjs
@@ -1,5 +1,7 @@
 /**
  * Header component
+ *
+ * @preserve
  */
 export class Header {
   /** @private */
diff --git a/packages/govuk-frontend/src/govuk/components/notification-banner/notification-banner.mjs b/packages/govuk-frontend/src/govuk/components/notification-banner/notification-banner.mjs
index bfd1bca269..67d192fbf4 100644
--- a/packages/govuk-frontend/src/govuk/components/notification-banner/notification-banner.mjs
+++ b/packages/govuk-frontend/src/govuk/components/notification-banner/notification-banner.mjs
@@ -3,6 +3,8 @@ import { normaliseDataset } from '../../common/normalise-dataset.mjs'
 
 /**
  * Notification Banner component
+ *
+ * @preserve
  */
 export class NotificationBanner {
   /** @private */
diff --git a/packages/govuk-frontend/src/govuk/components/radios/radios.mjs b/packages/govuk-frontend/src/govuk/components/radios/radios.mjs
index aaccf0dced..95bbb9d417 100644
--- a/packages/govuk-frontend/src/govuk/components/radios/radios.mjs
+++ b/packages/govuk-frontend/src/govuk/components/radios/radios.mjs
@@ -1,5 +1,7 @@
 /**
  * Radios component
+ *
+ * @preserve
  */
 export class Radios {
   /** @private */
diff --git a/packages/govuk-frontend/src/govuk/components/skip-link/skip-link.mjs b/packages/govuk-frontend/src/govuk/components/skip-link/skip-link.mjs
index 45466f757b..da3a3e3c4c 100644
--- a/packages/govuk-frontend/src/govuk/components/skip-link/skip-link.mjs
+++ b/packages/govuk-frontend/src/govuk/components/skip-link/skip-link.mjs
@@ -1,5 +1,7 @@
 /**
  * Skip link component
+ *
+ * @preserve
  */
 export class SkipLink {
   /** @private */
@@ -15,7 +17,6 @@ export class SkipLink {
   linkedElementListener = false
 
   /**
-   *
    * @param {Element} $module - HTML element to use for skip link
    */
   constructor($module) {
diff --git a/packages/govuk-frontend/src/govuk/components/tabs/tabs.mjs b/packages/govuk-frontend/src/govuk/components/tabs/tabs.mjs
index 54e1295e5f..75c4b8225e 100644
--- a/packages/govuk-frontend/src/govuk/components/tabs/tabs.mjs
+++ b/packages/govuk-frontend/src/govuk/components/tabs/tabs.mjs
@@ -1,5 +1,7 @@
 /**
  * Tabs component
+ *
+ * @preserve
  */
 export class Tabs {
   /** @private */