/**
 * Joins path segments using `/` separator.
 * @param segments A list of **valid** path segments.
 * @returns A joined path.
 */
export declare function generatePath(...segments: string[]): string;
/**
 * Returns `fn(value)` spread into an object if `value` is defined, otherwise an empty object.
 *
 * Used to conditionally include a property on a payload object without
 * resorting to mutation or ternary-built object literals.
 */
export declare function spreadIfDefined<T, V extends Record<string, unknown>>(value: T | undefined, fn: (v: T) => V): V | Record<string, never>;