import { SerializedGFError } from './serialized/types';
import { GFError, GFErrorOptions } from './types';
export declare const GF_ERROR_IDENTIFIER_PROP_NAME = "__gfError";
/**
 * Asserts that the provided error is a `GFError` and not a native JS `Error` instance.
 *
 * @example
 * isGFError(new Error()) // false
 * isGFError(createGFError(...)) // true
 */
export declare const isGFError: (error: GFError | Error) => error is GFError<any>;
/**
 * Asserts that the provided error is a `GFError` and not `GFErrorOptions`.
 *
 * @example
 * isGFError({ message: 'This is an error' }) // false
 * isGFError(createGFError(...)) // true
 */
export declare const isGFErrorAndNotOptions: (error: GFError | GFErrorOptions) => error is GFError<any>;
/**
 * Asserts that the provided error is a `SerializedGFError` and not a native JS `Error` instance or something else.
 *
 * Note: This works by determining if the given error has a `msg` property, as this is present
 * for a `SerializedGFError` object but not for native JS `Error` objects.
 *
 * @example
 * isSerializedGFError({ name: 'ENOENT', message: 'File not found', ... }) // false
 * isSerializedGFError(createGFError(...).serialize()) // true
 */
export declare const isSerializedGFError: (error: SerializedGFError | Error) => error is SerializedGFError<any>;