Method once

packages/firebase-database/index.ios.ts:278–300

(eventType: EventType, successCallback?: (a: DataSnapshot, b: string) => any, failureCallbackContext?: (a: any) => void | Record<string, any>)

	}

	once(eventType: EventType, successCallback?: (a: DataSnapshot, b: string) => any, failureCallbackContext?: (a: any) => void | Record<string, any>): Promise<DataSnapshot> {
		return new Promise((resolve, reject) => {
			this.native.observeSingleEventOfTypeAndPreviousSiblingKeyWithBlockWithCancelBlock?.(
				toFIRDataEventType(eventType),
				(snapshot, key) => {
					const ss = DataSnapshot.fromNative(snapshot);
					successCallback?.(ss, key);
					resolve(ss);
				},
				(error) => {
					failureCallbackContext?.({
						message: error.localizedDescription,
						native: error,
					});

					reject({
						message: error.localizedDescription,
						native: error,
					});
				}
			);
		});
	}

	orderByChild(path: string): Query {
		return Query.fromNative(this.native.queryOrderedByChild(path));