/**
 * Custom error class for API-related errors in the fuapi framework.
 * Extends the base Error class with an additional numeric error code for better error handling.
 * Used throughout the framework to provide structured error information with both HTTP status codes
 * and custom application error codes.
 *
 * @example
 * ```typescript
 * // Throwing an API error with HTTP status code
 * throw new APIError(404, 'User not found')
 *
 * // Catching and handling API errors
 * try {
 *   await apiCall()
 * } catch (error) {
 *   if (error instanceof APIError) {
 *     console.log(`Error ${error.code}: ${error.message}`)
 *   }
 * }
 * ```
 */
export declare class APIError extends Error {
    readonly code: number;
    /**
     * Creates a new APIError instance.
     *
     * @param code - HTTP status code or custom error code (e.g., 404, 500, 403)
     * @param msg - Human-readable error message describing the error
     */
    constructor(code: number, msg: string);
}
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