add files listing

mobile/modules/expo-download-detect/src/ExpoDownloadDetect.types.ts

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+export type FileDetectedEvent = {
+  id: string;
+  uri: string;
+  name: string;
+  mimeType: string;
+  size: number;
+  createdAt: number;
+  source: 'download' | 'mediastore' | 'startup';
+};
+
+export type ExpoDownloadDetectModuleEvents = {
+  onNewFile: (event: FileDetectedEvent) => void;
+};

mobile/modules/expo-download-detect/src/ExpoDownloadDetectModule.ts

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+import { NativeModule, requireNativeModule } from 'expo';
+import { ExpoDownloadDetectModuleEvents, FileDetectedEvent } from './ExpoDownloadDetect.types';
+
+declare class ExpoDownloadDetectModule extends NativeModule<ExpoDownloadDetectModuleEvents> {
+  startWatching(): void;
+  stopWatching(): void;
+  getRecentDownloads(): Promise<FileDetectedEvent[]>;
+}
+
+export default requireNativeModule<ExpoDownloadDetectModule>('ExpoDownloadDetect');

mobile/modules/expo-download-detect/src/index.ts

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+export { default as ExpoDownloadDetectModule } from './ExpoDownloadDetectModule';
+export type { FileDetectedEvent, ExpoDownloadDetectModuleEvents } from './ExpoDownloadDetect.types';