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Meta Open Source is officially transferring Jest, its open source JavaScript testing framework, to the OpenJS Foundation.  With over 17 million weekly downloads and over 38,000 GitHub stars, Jest is the most used testing framework in the JavaScript ecosystem and is used by companies of all sizes, including Amazon, Google, Microsoft, and Stripe. We believe [...] Read More... The post Meta Open Source is transferring Jest to the OpenJS Foundation appeared first on Engineering at Meta. http://dlvr.it/SQ9kkK

More than 3 billion people around the world rely on our services each month. On mobile, around 57 percent of people on Facebook for Android and 49 percent of those on Facebook for iOS use the app in a language other than English. Delivering the best experience for these people, in their own language, is [...] Read More... The post Language packs: Meta’s mobile localization solution appeared first on Engineering at Meta. http://dlvr.it/SQ2X6Z

Building infrastructure that can easily recover from outages, particularly outages involving adjacent infrastructure, too often becomes a murky exploration of nuanced fate-sharing between systems. Untangling dependencies and uncovering side effects of unavailability has historically been time-consuming work. A lack of great tooling built for this, and the rarity of infrastructure outages, makes reasoning about them [...] Read More... The post BellJar: A new framework for testing system recoverability at scale appeared first on Engineering at Meta. http://dlvr.it/SPqvD7

Over the years, Meta has invested in a number of storage service offerings that cater to different use cases and workload characteristics. Along the way, we’ve aimed to reduce and converge the systems in the storage space. At the same time, having a dedicated solution for critical package workload makes everyone happier. Having this in [...] Read More... The post Delta: A highly available, strongly consistent storage service using chain replication appeared first on Engineering at Meta. http://dlvr.it/SPm5Sk

Since Instagram runs one of the world’s largest deployments of the Django web framework, we have natural interest in finding ways to optimize Python so we can speed up our production application. As part of this effort, we’ve recently open-sourced Cinder, our Python runtime that is a fork of CPython. Cinder includes optimizations like immortal [...] Read More... The post How the Cinder JIT’s function inliner helps us optimize Instagram appeared first on Engineering at Meta. http://dlvr.it/SPdWLk

Delivering on our vision for the metaverse will require us to reimagine a network infrastructure capable of supporting the computing platforms of the future. Although the metaverse is still a ways off, elements of it are already underway and we are already collaborating with telecommunications companies around the world to develop shared, open access optical [...] Read More... The post A new way to survey potential fiber routes — without access to paved roads appeared first on Engineering at Meta. http://dlvr.it/SPc61L