http-proxy-middleware/dist/errors.js

The one-liner node.js proxy middleware for connect, express, next.js and more

export class HttpProxyMiddlewareError extends Error {
    code;
    constructor(message, code) {
        super(message);
        // add custom `code` property
        // so this can be used in src/plugins/default/error-response-plugin.ts to determine the status code to return
        this.code = code;
        // set the correct name for the error class
        this.name = this.constructor.name;
        // maintain proper stack trace (V8 environments)
        if (Error.captureStackTrace) {
            Error.captureStackTrace(this, this.constructor);
        }
    }
}