diff --git a/ReactAndroid/src/main/java/com/facebook/react/bridge/CatalystInstance.java b/ReactAndroid/src/main/java/com/facebook/react/bridge/CatalystInstance.java
index 50aff5fcb..aba8879f6 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/bridge/CatalystInstance.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/bridge/CatalystInstance.java
@@ -21,7 +21,7 @@ import javax.annotation.Nullable;
  */
 @DoNotStrip
 public interface CatalystInstance
-    extends MemoryPressureListener, JSInstance {
+    extends MemoryPressureListener, JSInstance, JSBundleLoaderDelegate {
   void runJSBundle();
 
   // Returns the status of running the JS bundle; waits for an answer if runJSBundle is running
diff --git a/ReactAndroid/src/main/java/com/facebook/react/bridge/CatalystInstanceImpl.java b/ReactAndroid/src/main/java/com/facebook/react/bridge/CatalystInstanceImpl.java
index b0cf871ad..d1aff6c8b 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/bridge/CatalystInstanceImpl.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/bridge/CatalystInstanceImpl.java
@@ -201,17 +201,8 @@ public class CatalystInstanceImpl implements CatalystInstance {
       Collection<JavaModuleWrapper> javaModules,
       Collection<ModuleHolder> cxxModules);
 
-  /**
-   * This API is used in situations where the JS bundle is being executed not on
-   * the device, but on a host machine. In that case, we must provide two source
-   * URLs for the JS bundle: One to be used on the device, and one to be used on
-   * the remote debugging machine.
-   *
-   * @param deviceURL A source URL that is accessible from this device.
-   * @param remoteURL A source URL that is accessible from the remote machine
-   * executing the JS.
-   */
-  /* package */ void setSourceURLs(String deviceURL, String remoteURL) {
+  @Override
+  public void setSourceURLs(String deviceURL, String remoteURL) {
     mSourceURL = deviceURL;
     jniSetSourceURL(remoteURL);
   }
@@ -221,17 +212,20 @@ public class CatalystInstanceImpl implements CatalystInstance {
     jniRegisterSegment(segmentId, path);
   }
 
-  /* package */ void loadScriptFromAssets(AssetManager assetManager, String assetURL, boolean loadSynchronously) {
+  @Override
+  public void loadScriptFromAssets(AssetManager assetManager, String assetURL, boolean loadSynchronously) {
     mSourceURL = assetURL;
     jniLoadScriptFromAssets(assetManager, assetURL, loadSynchronously);
   }
 
-  /* package */ void loadScriptFromFile(String fileName, String sourceURL, boolean loadSynchronously) {
+  @Override
+  public void loadScriptFromFile(String fileName, String sourceURL, boolean loadSynchronously) {
     mSourceURL = sourceURL;
     jniLoadScriptFromFile(fileName, sourceURL, loadSynchronously);
   }
 
-  /* package */ void loadScriptFromDeltaBundle(
+  @Override
+  public void loadScriptFromDeltaBundle(
     String sourceURL,
     NativeDeltaClient deltaClient,
     boolean loadSynchronously) {
diff --git a/ReactAndroid/src/main/java/com/facebook/react/bridge/FallbackJSBundleLoader.java b/ReactAndroid/src/main/java/com/facebook/react/bridge/FallbackJSBundleLoader.java
index 93f14f1f4..50c47aa8a 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/bridge/FallbackJSBundleLoader.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/bridge/FallbackJSBundleLoader.java
@@ -50,10 +50,10 @@ public final class FallbackJSBundleLoader extends JSBundleLoader {
    * it is replaced by the next most preferred loader.
    */
   @Override
-  public String loadScript(CatalystInstanceImpl instance) {
+  public String loadScript(JSBundleLoaderDelegate delegate) {
     while (true) {
       try {
-        return getDelegateLoader().loadScript(instance);
+        return getDelegateLoader().loadScript(delegate);
       } catch (Exception e) {
         if (e.getMessage() == null || !e.getMessage().startsWith(RECOVERABLE)) {
           throw e;
diff --git a/ReactAndroid/src/main/java/com/facebook/react/bridge/JSBundleLoader.java b/ReactAndroid/src/main/java/com/facebook/react/bridge/JSBundleLoader.java
index 44164e32e..3aff0da69 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/bridge/JSBundleLoader.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/bridge/JSBundleLoader.java
@@ -8,12 +8,11 @@
 package com.facebook.react.bridge;
 
 import android.content.Context;
-import com.facebook.react.bridge.NativeDeltaClient;
 import com.facebook.react.common.DebugServerException;
 
 /**
- * A class that stores JS bundle information and allows {@link CatalystInstance} to load a correct
- * bundle through {@link ReactBridge}.
+ * A class that stores JS bundle information and allows a {@link JSBundleLoaderDelegate}
+ * (e.g. {@link CatalystInstance}) to load a correct bundle through {@link ReactBridge}.
  */
 public abstract class JSBundleLoader {
 
@@ -28,8 +27,8 @@ public abstract class JSBundleLoader {
       final boolean loadSynchronously) {
     return new JSBundleLoader() {
       @Override
-      public String loadScript(CatalystInstanceImpl instance) {
-        instance.loadScriptFromAssets(context.getAssets(), assetUrl, loadSynchronously);
+      public String loadScript(JSBundleLoaderDelegate delegate) {
+        delegate.loadScriptFromAssets(context.getAssets(), assetUrl, loadSynchronously);
         return assetUrl;
       }
     };
@@ -49,8 +48,8 @@ public abstract class JSBundleLoader {
       final boolean loadSynchronously) {
     return new JSBundleLoader() {
       @Override
-      public String loadScript(CatalystInstanceImpl instance) {
-        instance.loadScriptFromFile(fileName, assetUrl, loadSynchronously);
+      public String loadScript(JSBundleLoaderDelegate delegate) {
+        delegate.loadScriptFromFile(fileName, assetUrl, loadSynchronously);
         return fileName;
       }
     };
@@ -68,9 +67,9 @@ public abstract class JSBundleLoader {
       final String cachedFileLocation) {
     return new JSBundleLoader() {
       @Override
-      public String loadScript(CatalystInstanceImpl instance) {
+      public String loadScript(JSBundleLoaderDelegate delegate) {
         try {
-          instance.loadScriptFromFile(cachedFileLocation, sourceURL, false);
+          delegate.loadScriptFromFile(cachedFileLocation, sourceURL, false);
           return sourceURL;
         } catch (Exception e) {
           throw DebugServerException.makeGeneric(e.getMessage(), e);
@@ -90,9 +89,9 @@ public abstract class JSBundleLoader {
     final NativeDeltaClient nativeDeltaClient) {
     return new JSBundleLoader() {
       @Override
-      public String loadScript(CatalystInstanceImpl instance) {
+      public String loadScript(JSBundleLoaderDelegate delegate) {
         try {
-          instance.loadScriptFromDeltaBundle(sourceURL, nativeDeltaClient, false);
+          delegate.loadScriptFromDeltaBundle(sourceURL, nativeDeltaClient, false);
           return sourceURL;
         } catch (Exception e) {
           throw DebugServerException.makeGeneric(e.getMessage(), e);
@@ -110,13 +109,13 @@ public abstract class JSBundleLoader {
       final String realSourceURL) {
     return new JSBundleLoader() {
       @Override
-      public String loadScript(CatalystInstanceImpl instance) {
-        instance.setSourceURLs(realSourceURL, proxySourceURL);
+      public String loadScript(JSBundleLoaderDelegate delegate) {
+        delegate.setSourceURLs(realSourceURL, proxySourceURL);
         return realSourceURL;
       }
     };
   }
 
   /** Loads the script, returning the URL of the source it loaded. */
-  public abstract String loadScript(CatalystInstanceImpl instance);
+  public abstract String loadScript(JSBundleLoaderDelegate delegate);
 }
diff --git a/ReactAndroid/src/main/java/com/facebook/react/bridge/JSBundleLoaderDelegate.java b/ReactAndroid/src/main/java/com/facebook/react/bridge/JSBundleLoaderDelegate.java
new file mode 100644
index 000000000..29c3af69d
--- /dev/null
+++ b/ReactAndroid/src/main/java/com/facebook/react/bridge/JSBundleLoaderDelegate.java
@@ -0,0 +1,58 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.bridge;
+
+import android.content.Context;
+import android.content.res.AssetManager;
+
+/**
+ * An interface for classes that initialize JavaScript using {@link JSBundleLoader}
+ */
+public interface JSBundleLoaderDelegate {
+
+  /**
+   * Load a JS bundle from Android assets. See {@link JSBundleLoader#createAssetLoader(Context, String, boolean)}
+   * @param assetManager
+   * @param assetURL
+   * @param loadSynchronously
+   */
+  void loadScriptFromAssets(AssetManager assetManager, String assetURL, boolean loadSynchronously);
+
+  /**
+   * Load a JS bundle from the filesystem.
+   * See {@link JSBundleLoader#createFileLoader(String)} and {@link JSBundleLoader#createCachedBundleFromNetworkLoader(String, String)}
+   * @param fileName
+   * @param sourceURL
+   * @param loadSynchronously
+   */
+  void loadScriptFromFile(String fileName, String sourceURL, boolean loadSynchronously);
+
+  /**
+   * Load a delta bundle from Metro.
+   * See {@link JSBundleLoader#createDeltaFromNetworkLoader(String, NativeDeltaClient)}
+   * @param sourceURL
+   * @param deltaClient
+   * @param loadSynchronously
+   */
+  void loadScriptFromDeltaBundle(
+    String sourceURL,
+    NativeDeltaClient deltaClient,
+    boolean loadSynchronously);
+
+  /**
+   * This API is used in situations where the JS bundle is being executed not on
+   * the device, but on a host machine. In that case, we must provide two source
+   * URLs for the JS bundle: One to be used on the device, and one to be used on
+   * the remote debugging machine.
+   *
+   * @param deviceURL A source URL that is accessible from this device.
+   * @param remoteURL A source URL that is accessible from the remote machine
+   * executing the JS.
+   */
+  void setSourceURLs(String deviceURL, String remoteURL);
+}