Bluebird is a fully featured promise library with focus on innovative features and performance. Bluebird is built with the following design principles in mind:
<li>
Pragmatic and not theoretical. - Bluebird will always pick the pragmatic route vs the theoretically elegant one when there is a conflict. The library's API was created based on real-life use cases and after a lot of consideration.</li>
<li>Fully featured without bloat - Bluebird provides all the tools and utilities needed to realize a highly expressive and fluent DSL for asynchronous JavaScript without suffering from bloat by avoiding incorporating features that are solely motivated by theoretical arguments, have extremely narrow applicability or have limited synergy and composability with existing features.</li>
<li>Easy to debug - A major consequence of choosing pragmatism over theoretical elegancy, a property that among promise libraries taken to this extent is unique to bluebird.

<ul>
<li>Bluebird ships with the best cross-platform long stack traces out there and a warning system. This helps you recognize common and devastating promise usage mistakes early before they lead to hard to debug code later.</li>
<li>Unhandled errors are not silently swallowed by default but reported along with helpful stack traces where applicable. All of this is of course configurable.</li>
</ul></li>
<li>Zero overhead abstraction - In server-side applications the performance of a promise implementation matters. Bluebird's server side performance is measured with highly relevant realistic end-to-end macro <a href="benchmarks.html" title="">benchmarks</a> and consistently comes out on top. We understand that if bluebird is as close to a zero cost abstraction as possible, developers won't be tempted to short-circuit and absorb complexity themselves.</li>
<li>Runs everywhere - Bluebird runs on pretty much every platform. This makes bluebird ideal for projects who care about providing consistent cross-platform and cross-version experience. It runs on old IE, it has even been known to run on Netscape 7.</li>
<li>Spec compatible - bluebird can work as a drop-in replacement for native promises for an instant performance boost. It passes the Promises/A+ test suite and is fully spec compliant.</li>

Bluebird is a fully featured promise library with focus on innovative features and performance. 

Bluebird - Promise library with unmatched performance.

ZIO is a zero-dependency Scala library for asynchronous and concurrent programming. It is powered by highly-scalable, non-blocking fibers that never waste or leak resources, ZIO lets you build scalable, resilient, and reactive applications that meet the needs of your business.
 
<ul>
<li>High-performance. Build scalable applications with 100x the performance of Scala's <code>Future</code>.</li>
<li>Type-safe. Use the full power of the Scala compiler to catch bugs at compile time.</li>
<li>Concurrent. Easily build concurrent apps without deadlocks, race conditions, or complexity.</li>
<li>Asynchronous. Write sequential code that looks the same whether it's asynchronous or synchronous.</li>
<li>Resource-safe. Build apps that never leak resources (including threads!), even when they fail.</li>
<li>Testable. Inject test services into your app for fast, deterministic, and type-safe testing.</li>
<li>Resilient. Build apps that never lose errors, and which respond to failure locally and flexibly.</li>
<li>Functional. Rapidly compose solutions to complex problems from simple building blocks.</li>
</ul>

ZIO is a zero-dependency Scala library for asynchronous and concurrent programming. It is powered by highly-scalable, non-blocking fibers that never waste or leak resources, ZIO lets you build scalable, resilient, and reactive applications that meet the needs of your business.

Zio - A type-safe, composable library for async and concurrent programming in Scala 

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