async-hooks-5.js

// node-request-context/index.js
const Namespace = require('./namespace');
const namespaces = {};

function createNamespace(name) {
    if (namespaces[name]) { throw new Error(`A namespace for ${name} is already exists`); }

    const namespace = new Namespace();
    namespaces[name] = namespace;
    createHooks(namespace); // wait for explanation below
    return namespace;
}
function getNamespace(name) {
    return namespaces[name];
}