/**
 * Custom error class for WASI http interface that properly formats payload for Jco compatibility
 *
 * https://bytecodealliance.github.io/jco/wit-type-representations.html#result-considerations-idiomatic-js-errors-for-host-implementations
 */
export declare class HttpError extends Error {
    payload: any;
    /**
     * Create a new WASI http error
     * @param {string} tag - The error tag/type
     * @param {string} [message] - Human-readable error message
     * @param {any} [val] - Optional value/data for the error
     */
    constructor(tag: any, message?: any, val?: any, opts?: {
        cause?: unknown;
    });
    static from(err: any): HttpError;
}