it-ws/dist/src/ready.js

Simple async iterables for websocket client connections

export default async (socket) => {
    // if the socket is closing or closed, return end
    if (socket.readyState >= 2) {
        throw new Error('socket closed');
    }
    // if open, return
    if (socket.readyState === 1) {
        return;
    }
    await new Promise((resolve, reject) => {
        function cleanup() {
            socket.removeEventListener('open', handleOpen);
            socket.removeEventListener('error', handleErr);
        }
        function handleOpen() {
            cleanup();
            resolve();
        }
        function handleErr(event) {
            cleanup();
            reject(event.error ?? new Error(`connect ECONNREFUSED ${socket.url}`));
        }
        socket.addEventListener('open', handleOpen);
        socket.addEventListener('error', handleErr);
    });
};
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