import fs from "fs";
import path from "path";
export declare namespace FileSystemIdentity {
    interface IIdentity {
        readonly caseSensitive: boolean;
        contains(file: string, directory: string): boolean;
        filesystemKey(file: string): string;
        isDeclarationFile(file: string): boolean;
        isSamePath(x: string, y: string): boolean;
        isSupportedExtension(file: string): boolean;
        projectFileKey(file: string): string;
    }
    function create(caseSensitive: boolean, pathApi?: typeof path.posix): IIdentity;
    class Policy {
        private caseSensitive_;
        private location_;
        observe(caseSensitive: boolean | undefined, location: string): void;
        get(): IIdentity;
    }
    function inspectDirectory(directory: string): Promise<boolean | undefined>;
    function probeDirectory(directory: string): Promise<boolean>;
    /**
     * Builds the key that decides whether two paths are the same filesystem
     * object.
     *
     * The identity is read from `fs.BigIntStats` rather than `fs.Stats`, because
     * `fs.Stats.ino` is a JavaScript number. An NTFS file ID is `(sequenceNumber
     * << 48) | mftRecordIndex` and routinely exceeds `Number.MAX_SAFE_INTEGER` —
     * in a 4000-directory probe, 1879 of them did — where the spacing between
     * representable doubles is 8 or more. Two entries sharing a sequence number
     * with MFT record indices within that spacing round to one double. The
     * traversal callers would then treat a distinct directory or file as already
     * visited and skip it with no diagnostic, and the overwrite guard would
     * refuse a legitimate output (samchon/typia#2269).
     *
     * A filesystem that reports no inode at all keeps the canonical path
     * fallback, which is the only identity available there.
     *
     * @param stat Stats read with `{ bigint: true }`.
     * @param realpath Canonical path of the same object.
     * @returns Key that is equal for two paths only when they are one object.
     */
    function identityKey(stat: Pick<fs.BigIntStats, "dev" | "ino">, realpath: string): string;
}