declare type FirebaseDatabaseWriters<T = any> = {
    set: (val: T) => T | Promise<T>;
    transaction: (<T>(a: T) => T) | ((transactionUpdate: (a: any) => any, onComplete?: ((a: Error | null, b: boolean, c: firebase.database.DataSnapshot | null) => any) | undefined, applyLocally?: boolean | undefined) => Promise<T>);
    update: (<T>(a: T) => T) | ((values: Object, onComplete?: ((a: Error | null) => any) | undefined) => Promise<any>);
    push: (<T>(a: T) => T) | ((value?: any, onComplete?: ((a: Error | null) => any) | undefined) => firebase.database.ThenableReference);
    pushWithKey: (callback: (key: string | null) => T | Promise<T>) => T | Promise<T> | undefined;
};
export default FirebaseDatabaseWriters;