wow.js

const continuation = require('continuation-local-storage');
const uuid = require('node-uuid');

const NAMESPACE = 'luha-test';
const namespace = continuation.createNamespace(NAMESPACE);

for (let i = 0; i < 5; i++) {
    namespace.run(function () {
        const id = uuid.v4();
        namespace.set('correlationId', id);

        setTimeout(() => printCorrelationId(id), Math.random() * 3000);
    });
}

function printCorrelationId(generatedId) {
    const ns = continuation.getNamespace(NAMESPACE);
    const correlationId = ns.get('correlationId');

    console.log(`Passed correlation Id is ${generatedId}, continuation correlation Id is ${correlationId}. Are they equal? ${generatedId === correlationId}`);

    new Promise(function (resolve) {
        setTimeout(resolve, Math.random() * 3000);
    }).then(function () {
        printCorrelationId(generatedId);
    });
}