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import{FirebaseApp}from'@firebase/app';import{NextFn}from'@firebase/util';import{Observer}from'@firebase/util';import{Unsubscribe}from'@firebase/util';// @publicexportfunctionexperimentalSetDeliveryMetricsExportedToBigQueryEnabled(messaging: Messaging,enable: boolean): void;// @publicexportinterfaceFcmOptions{analyticsLabel?: string;link?: string;}// @publicexportfunctiongetMessaging(app?: FirebaseApp): Messaging;// @publicexportinterfaceGetTokenOptions{serviceWorkerRegistration?: ServiceWorkerRegistration;vapidKey?: string;}// @publicexportfunctionisSupported(): Promise<boolean>;// @publicexportinterfaceMessagePayload{collapseKey: string;data?: {[key: string]: string;};fcmOptions?: FcmOptions;from: string;messageId: string;notification?: NotificationPayload;}// @publicexportinterfaceMessaging{app: FirebaseApp;}export{NextFn}// @publicexportinterfaceNotificationPayload{body?: string;icon?: string;image?: string;title?: string;}export{Observer}// @publicexportfunctiononBackgroundMessage(messaging: Messaging,nextOrObserver: NextFn<MessagePayload>|Observer<MessagePayload>): Unsubscribe;export{Unsubscribe}// (No @packageDocumentation comment for this package)