it-ws/dist/src/ws-url.js

Simple async iterables for websocket client connections

const map = { 'http:': 'ws:', 'https:': 'wss:' };
const defaultProtocol = 'ws:';
export default (url, location) => {
    if (url.startsWith('//')) {
        url = `${location?.protocol ?? defaultProtocol}${url}`;
    }
    if (url.startsWith('/') && location != null) {
        const proto = location.protocol ?? defaultProtocol;
        const host = location.host;
        const port = location.port != null && host?.endsWith(`:${location.port}`) !== true ? `:${location.port}` : '';
        url = `${proto}//${host}${port}${url}`;
    }
    const wsUrl = new URL(url);
    for (const [httpProto, wsProto] of Object.entries(map)) {
        if (wsUrl.protocol === httpProto) {
            wsUrl.protocol = wsProto;
        }
    }
    return wsUrl;
};
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