feat: add prefetch

Author: gtokman

ios/FasterImageViewManager.m

@@ -10,4 +10,6 @@ @interface RCT_EXTERN_MODULE(FasterImageViewManager, RCTViewManager)
 
 RCT_EXTERN_METHOD(clearCache:(RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject)
 
+RCT_EXTERN_METHOD(prefetch:(NSArray) sources resolve:(RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject)
+
 @end

ios/FasterImageViewManager.swift

@@ -21,6 +21,18 @@ final class FasterImageViewManager: RCTViewManager {
             }
         }
     }
+
+  @objc
+  func prefetch(_ sources: [String],
+                resolve: @escaping RCTPromiseResolveBlock,
+                reject: @escaping RCTPromiseRejectBlock) {
+                do {
+    let prefetcher = ImagePrefetcher()
+    let urls = sources.map { url in URL(string: url )}.compactMap{ $0 }
+    prefetcher.startPrefetching(with: urls)
+    resolve(true)
+    } catch { reject() }
+  }
 }
 
 struct ImageOptions: Decodable {

src/index.tsx

@@ -1,9 +1,9 @@
 import {
+  ColorValue,
   ImageStyle,
-  requireNativeComponent,
   NativeModules,
   Platform,
-  ColorValue,
+  requireNativeComponent,
 } from 'react-native';
 
 export type IOSImageResizeMode =
@@ -130,3 +130,13 @@ export const clearCache = async () => {
     return FasterImageModule.clearCache();
   }
 };
+
+export const prefetch(sources: string[]): Promise<void> {
+  if (Platform.OS === 'ios') {
+    const { FasterImageViewManager } = NativeModules;
+    return FasterImageViewManager.prefetch(sources);
+  } else {
+    const { FasterImageModule } = NativeModules;
+    return FasterImageModule.prefetch(sources);
+  }
+}