/**
 * Shared errno narrowing for the filesystem paths under `core/tools`.
 *
 * TypeScript types a `catch` binding as `unknown` and there is no safe way to
 * declare it narrower at the catch site, so narrowing happens here once rather
 * than in a copy per module. `NodeJS.ErrnoException` is not used as the
 * parameter type for the same reason: the value genuinely is unknown until it
 * has been inspected, and asserting otherwise would be a lie the compiler
 * cannot check.
 */
/** An error carrying a string `code`, which is what the callers actually need. */
export interface ErrnoLikeError extends Error {
    code: string;
}
/** True when `error` carries a string errno `code`. */
export declare function isErrnoLikeError(error: unknown): error is ErrnoLikeError;
/**
 * Return the errno `code` of `error`, or `undefined` when it carries none.
 *
 * Accepts a non-`Error` shape with a string `code` too: `Bun.write` and some
 * native bindings reject with plain objects, and dropping those on the floor
 * would silently turn a recognizable `EEXIST` into an unhandled failure.
 */
export declare function getErrnoCode(error: unknown): string | undefined;
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