import { NextOrObserver } from "./auth.types";
/**
 * Turns a base path and path segments into a single path for indexing Firebase documents
 * For example, joinPath('a', 'b', 'c') returns 'a/b/c'
 * @param path The base path
 * @param pathSegments The path segments to join
 * @returns The joined path
 */
export declare function joinPath(path: string, ...pathSegments: string[]): string;
export declare function wrapNextOrObserver<T, W>(current: NextOrObserver<W | null>, wrapper: (t: T) => W): NextOrObserver<T | null>;
export declare function sanitiseObject(data: {
    [field: string]: unknown;
}, sanitisingFunction: (field: string, value: unknown) => unknown): {
    [field: string]: unknown;
};
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