fix(lib/assets): make RN resolve custom assets properly

lib/assets/src/index.ts

@@ -77,12 +77,11 @@ export function setPreferredAssetType(type: Asset['type']) {
  * @throws An error if an asset with the same name and type already exists and `override` is not set to true.
  */
 export function registerAsset(asset: RegisterableAsset, override?: boolean) {
-    const { name } = asset
+    const { name, type } = asset
 
     if (override) _overrides.set(name, asset)
     // Make sure to not override the asset if it already exists, unless explicitly set to override
-    else if (_assets.get(name)?.[1]?.[asset.type])
-        throw new Error(`Asset "${name}" with type "${asset.type}" already exists`)
+    else if (_assets.get(name)?.[1]?.[type]) throw new Error(`Asset "${name}" with type "${type}" already exists`)
 
     // @ts-expect-error
     return AssetRegistry.registerAsset(asset)

lib/assets/src/patches.ts

@@ -57,6 +57,16 @@ const unsubForResolveAssetSource = waitForModules(
     (_, resolveAssetSource) => {
         unsubForResolveAssetSource()
 
+        // Custom assets
+        // Why do we need to do this? Because RN will attempt to resolve the asset via its path, which we don't provide via custom assets.
+        // This will result in a crash, because it tries to read the path and run checks on it, but the path is undefined.
+        // @ts-expect-error
+        resolveAssetSource.addCustomSourceTransformer(({ asset }) => {
+            // @ts-expect-error
+            if (!asset.__packager_asset) return asset
+        })
+
+        // Asset overrides
         // @ts-expect-error
         resolveAssetSource.addCustomSourceTransformer(({ asset }) => _overrides.get(asset.name))
     },