diff --git a/modules/ext.cite.referencePreviews/constants.js b/modules/ext.cite.referencePreviews/constants.js
deleted file mode 100644
index 8d0d2cd7f..000000000
--- a/modules/ext.cite.referencePreviews/constants.js
+++ /dev/null
@@ -1,4 +0,0 @@
-module.exports = {
-	TYPE_REFERENCE: 'reference',
-	FETCH_DELAY_REFERENCE_TYPE: 150
-};
diff --git a/modules/ext.cite.referencePreviews/createReferenceGateway.js b/modules/ext.cite.referencePreviews/createReferenceGateway.js
index 8d165c26b..4a53ee2e9 100644
--- a/modules/ext.cite.referencePreviews/createReferenceGateway.js
+++ b/modules/ext.cite.referencePreviews/createReferenceGateway.js
@@ -2,7 +2,7 @@
  * @module gateway/reference
  */
 
-const { TYPE_REFERENCE } = require( './constants.js' );
+const TYPE_REFERENCE = 'reference';
 
 /**
  * @return {Gateway}
diff --git a/modules/ext.cite.referencePreviews/index.js b/modules/ext.cite.referencePreviews/index.js
index 7b2fbc109..1099ab287 100644
--- a/modules/ext.cite.referencePreviews/index.js
+++ b/modules/ext.cite.referencePreviews/index.js
@@ -1,15 +1,36 @@
-const isReferencePreviewsEnabled = require( './isReferencePreviewsEnabled.js' );
 const { initReferencePreviewsInstrumentation, LOGGING_SCHEMA } = require( './referencePreviewsInstrumentation.js' );
 const createReferenceGateway = require( './createReferenceGateway.js' );
-const renderFn = require( './createReferencePreview.js' );
-const { TYPE_REFERENCE, FETCH_DELAY_REFERENCE_TYPE } = require( './constants.js' );
+const createReferencePreview = require( './createReferencePreview.js' );
+const TYPE_REFERENCE = 'reference';
+
+/**
+* Given the global state of the application, creates a function that gets
+* whether or not the user should have Reference Previews enabled.
+*
+* @param {mw.user} user The `mw.user` singleton instance
+* @param {Function} isPreviewTypeEnabled check whether preview has been disabled or enabled.
+* @param {mw.Map} config
+*
+* @return {boolean|null} Null when there is no way the popup type can be enabled at run-time.
+* @memberof module:ext.cite.referencePreviews
+*/
+function isReferencePreviewsEnabled( user, isPreviewTypeEnabled, config ) {
+	if ( !config.get( 'wgCiteReferencePreviewsActive' ) ) {
+		return null;
+	}
+
+	if ( user.isAnon() ) {
+		return isPreviewTypeEnabled( TYPE_REFERENCE );
+	}
+
+	return true;
+}
 
 const referencePreviewsState = isReferencePreviewsEnabled(
 	mw.user,
 	mw.popups.isEnabled,
 	mw.config
 );
-const gateway = createReferenceGateway();
 
 // For tracking baseline stats in the Cite extension https://phabricator.wikimedia.org/T353798
 // FIXME: This might be obsolete when the code moves to the Cite extension and the tracking there
@@ -22,22 +43,32 @@ mw.trackSubscribe( 'Popups.SettingChange', ( data ) => {
 	}
 } );
 
-module.exports = referencePreviewsState !== null ? {
-	type: TYPE_REFERENCE,
-	selector: '#mw-content-text .reference a[ href*="#" ]',
-	delay: FETCH_DELAY_REFERENCE_TYPE,
-	gateway,
-	renderFn,
-	init: () => {
-		initReferencePreviewsInstrumentation();
-	}
-} : null;
+/**
+ * Create the relevant config to register the preview type in the Popups extension.
+ *
+ * @see mw.popups.register()
+ * @memberof module:ext.cite.referencePreviews
+ */
+function createReferencePreviewsType() {
+	return {
+		type: TYPE_REFERENCE,
+		selector: '#mw-content-text .reference a[ href*="#" ]',
+		delay: 150,
+		gateway: createReferenceGateway(),
+		renderFn: createReferencePreview,
+		init: () => {
+			initReferencePreviewsInstrumentation();
+		}
+	};
+}
+
+module.exports = referencePreviewsState !== null ? createReferencePreviewsType() : null;
 
 // Expose private methods for QUnit tests
 if ( typeof QUnit !== 'undefined' ) {
 	module.exports = { private: {
 		createReferenceGateway: require( './createReferenceGateway.js' ),
 		createReferencePreview: require( './createReferencePreview.js' ),
-		isReferencePreviewsEnabled: require( './isReferencePreviewsEnabled.js' )
+		isReferencePreviewsEnabled
 	} };
 }
diff --git a/modules/ext.cite.referencePreviews/isReferencePreviewsEnabled.js b/modules/ext.cite.referencePreviews/isReferencePreviewsEnabled.js
deleted file mode 100644
index 2c22ce404..000000000
--- a/modules/ext.cite.referencePreviews/isReferencePreviewsEnabled.js
+++ /dev/null
@@ -1,29 +0,0 @@
-const { TYPE_REFERENCE } = require( './constants.js' );
-
-/**
- * @module isReferencePreviewsEnabled
- */
-
-/**
- * Given the global state of the application, creates a function that gets
- * whether or not the user should have Reference Previews enabled.
- *
- * @param {mw.user} user The `mw.user` singleton instance
- * @param {Function} isPreviewTypeEnabled check whether preview has been disabled or enabled.
- * @param {mw.Map} config
- *
- * @return {boolean|null} Null when there is no way the popup type can be enabled at run-time.
- */
-function isReferencePreviewsEnabled( user, isPreviewTypeEnabled, config ) {
-	if ( !config.get( 'wgCiteReferencePreviewsActive' ) ) {
-		return null;
-	}
-
-	if ( user.isAnon() ) {
-		return isPreviewTypeEnabled( TYPE_REFERENCE );
-	}
-
-	return true;
-}
-
-module.exports = isReferencePreviewsEnabled;
diff --git a/src/Hooks/CiteHooks.php b/src/Hooks/CiteHooks.php
index c0cc77361..15842e5dd 100644
--- a/src/Hooks/CiteHooks.php
+++ b/src/Hooks/CiteHooks.php
@@ -125,10 +125,8 @@ class CiteHooks implements
 				],
 				'packageFiles' => [
 					'index.js',
-					'constants.js',
 					'createReferenceGateway.js',
 					'createReferencePreview.js',
-					'isReferencePreviewsEnabled.js',
 					'referencePreviewsInstrumentation.js'
 				]
 			]