@whatwg-node/server/esm/utils.js

Fetch API compliant HTTP Server adapter

export function isAsyncIterable(body) {
    return (body != null && typeof body === 'object' && typeof body[Symbol.asyncIterator] === 'function');
}
export function isReadableStream(stream) {
    return stream != null && stream.getReader != null;
}
export function isRequestInit(val) {
    return (val != null &&
        typeof val === 'object' &&
        ('body' in val ||
            'cache' in val ||
            'credentials' in val ||
            'headers' in val ||
            'integrity' in val ||
            'keepalive' in val ||
            'method' in val ||
            'mode' in val ||
            'redirect' in val ||
            'referrer' in val ||
            'referrerPolicy' in val ||
            'signal' in val ||
            'window' in val));
}
// from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign#copying_accessors
export function completeAssign(...args) {
    const [target, ...sources] = args.filter(arg => arg != null && typeof arg === 'object');
    sources.forEach(source => {
        // modified Object.keys to Object.getOwnPropertyNames
        // because Object.keys only returns enumerable properties
        const descriptors = Object.getOwnPropertyNames(source).reduce((descriptors, key) => {
            descriptors[key] = Object.getOwnPropertyDescriptor(source, key);
            return descriptors;
        }, {});
        // By default, Object.assign copies enumerable Symbols, too
        Object.getOwnPropertySymbols(source).forEach(sym => {
            const descriptor = Object.getOwnPropertyDescriptor(source, sym);
            if (descriptor.enumerable) {
                descriptors[sym] = descriptor;
            }
        });
        Object.defineProperties(target, descriptors);
    });
    return target;
}
export function addWaitUntil(serverContext, waitUntilPromises) {
    serverContext['waitUntil'] = function (promise) {
        if (promise != null) {
            waitUntilPromises.push(promise);
        }
    };
}