/**
 * Filesystem error with a POSIX error code and numeric `errno`.
 *
 * Matches the shape of `NodeJS.ErrnoException` so Go's `os` package interprets
 * it as a proper `os.PathError` with a numeric error code. Thrown by the MemFS
 * implementation for rejected virtual filesystem operations.
 *
 * @evidence contracts/common.md#principled-implementation
 *   Error fields follow NodeJS.ErrnoException and Go's js/wasm filesystem bridge;
 *   numeric errno values describe that virtual ABI, not the browser host OS.
 * @evidence contracts/common.md#clear-and-simple-design
 *   The Error subclass groups the bridge's machine fields with its message;
 *   one private mapping owns errno translation for every virtual operation.
 * @evidence contracts/common.md#prohibited-implementation-shortcuts
 *   POSIX error identifiers are protocol constants; failed operations remain
 *   errors instead of returning a fake successful callback value.
 * @evidence contracts/common.md#meaningful-documentation
 *   Native JSDoc explains the bridge and members' machine-readable roles,
 *   following the documentation skill's concrete context guidance.
 * @evidenceExclude contracts/performance.md#bound-retention-and-release-resources MemFSError retains only its own fields and is released with the thrown error.
 * @evidenceExclude contracts/performance.md#efficient-algorithms MemFSError maps a code with one constant switch and chooses no processing strategy.
 * @evidenceExclude contracts/performance.md#reuse-equivalent-work MemFSError is an error value and coordinates no shared or repeated computation.
 */
export declare class MemFSError extends Error {
    /** POSIX symbolic error, consumed by the Go bridge. */
    code: string;
    /** Negative Linux-style errno for the virtual filesystem ABI. */
    errno: number;
    /** Normalized virtual path, when the failing operation identifies one. */
    path?: string;
    /** Filesystem operation that produced the error. */
    syscall?: string;
    constructor(code: string, syscall: string, path?: string);
}