@rxts/koa-proxy/lib/es2015.js

`http-proxy` wrapper as Koa middleware

import httpProxy from 'http-proxy';

/*! *****************************************************************************
Copyright (c) Microsoft Corporation. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use
this file except in compliance with the License. You may obtain a copy of the
License at http://www.apache.org/licenses/LICENSE-2.0

THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
MERCHANTABLITY OR NON-INFRINGEMENT.

See the Apache Version 2.0 License for specific language governing permissions
and limitations under the License.
***************************************************************************** */

function __rest(s, e) {
    var t = {};
    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
        t[p] = s[p];
    if (s != null && typeof Object.getOwnPropertySymbols === "function")
        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable.call(s, p[i]))
                t[p[i]] = s[p[i]];
        }
    return t;
}

const proxy = (_a = {}) => {
    var { listeners = {}, override, skipError } = _a, options = __rest(_a, ["listeners", "override", "skipError"]);
    const proxy = httpProxy.createProxyServer(options);
    Object.keys(listeners).forEach(event => {
        const listener = listeners[event];
        if (listener) {
            // @ts-ignore
            proxy.on(event, listener);
        }
    });
    return (ctx, next) => new Promise((resolve, reject) => {
        proxy.web(ctx.req, ctx.res, typeof override === 'function' ? override(ctx) : undefined, err => 
        // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
        err ? (skipError ? resolve(next()) : reject(err)) : resolve());
    });
};

export default proxy;
export { proxy };