@libp2p/websockets/dist/src/utils.js

JavaScript implementation of the WebSockets module that libp2p uses and that implements the interface-transport spec

/**
 * Adds properties/methods to a `WebSocket` instance from the `ws` module to be
 * compatible with the `globalThis.WebSocket` API
 */
export function toWebSocket(ws) {
    Object.defineProperty(ws, 'url', {
        value: '',
        writable: false
    });
    // @ts-expect-error not a WS/WebSocket method
    ws.dispatchEvent = (evt) => {
        if (evt.type === 'close') {
            ws.emit('close');
        }
        if (evt.type === 'open') {
            ws.emit('open');
        }
        if (evt.type === 'message') {
            const m = evt;
            ws.emit('data', m.data);
        }
        if (evt.type === 'error') {
            ws.emit('error', new Error('An error occurred'));
        }
        ws.emit(evt.type, evt);
    };
    // @ts-expect-error ws is now WebSocket
    return ws;
}
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