import { type FastifyRequest } from "fastify";
import { type AbsolutePath } from "./path-utils";
export declare function findAppRootPath(): AbsolutePath;
export declare function findApiRootPath(): AbsolutePath;
export declare function nonNullable<T>(value: T): value is NonNullable<T>;
export declare function exhaustive(_param: never): void;
export declare function assertExists<T>(value: T | null | undefined, message?: string): T;
export declare function assertNotNull<T>(value: T | null, message?: string): T;
export declare function assertDefined<T>(value: T | undefined, message?: string): T;
export declare function intersectionBy<T, K>(arr1: readonly T[], arr2: readonly T[], iteratee: (item: T) => K): T[];
export declare function differenceWith<T>(arr1: readonly T[], arr2: readonly T[], comparator: (a: T, b: T) => boolean): T[];
export declare function merge<T extends Record<string, any>>(defaultObj: T, userObj: T): T;
export declare function isPlainObject(value: unknown): value is Record<string, unknown>;
export declare function convertFastifyHeadersToStandard(headers: FastifyRequest["headers"]): Headers;
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