/**
 * Retrieves the value from a Firebase database snapshot.
 * This function checks if the provided data object is a valid Firebase snapshot and
 * calls its `.val()` method to get the actual data value.
 *
 * @param {firebase.database.DataSnapshot} data - The Firebase database snapshot from which to retrieve the value.
 * @returns {any} The value stored in the snapshot, or `null` if the data is invalid or doesn't contain a valid value.
 */
export default function getDBValue(data: firebase.database.DataSnapshot): any;
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