export declare function segmentCount(path: string): number;
/**
 * Returns an error message if `path` is not a valid collection path
 * (collection paths have an odd number of segments: "users", "users/123/posts").
 * Returns null if the path is valid.
 */
export declare function collectionPathError(path: string): string | null;
/**
 * Returns an error message if `path` is not a valid document path
 * (document paths have an even number of segments: "users/123", "stores/ABC/orders/456").
 * Returns null if the path is valid.
 */
export declare function documentPathError(path: string): string | null;
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