Thousands of new open source projects were created and engineers shared more code than ever before.

The first major JavaScript package manager, npm, was built shortly after Node.js was introduced, and it quickly became one of the most popular package managers in the world. In the days before package managers, it was commonplace for JavaScript engineers to rely on a small number of dependencies stored directly in their projects or served by a CDN. The evolution of JavaScript package management at Facebook Yarn enables engineers to move faster and with confidence when using shared code so they can focus on what matters - building new products and features. With Yarn, engineers still have access to the npm registry, but can install packages more quickly and manage dependencies consistently across machines or in secure offline environments. We're pleased to announce the open source release of Yarn, a collaboration with Exponent, Google, and Tilde. The product of that work is called Yarn - a fast, reliable, and secure alternative npm client. After trying to solve for each issue as it came up, we set out to build a new solution to help us manage our dependencies more reliably.

We've used the npm client successfully at Facebook for years, but as the size of our codebase and the number of engineers grew, we ran into problems with consistency, security, and performance. The most popular JavaScript package manager is the npm client, which provides access to more than 300,000 packages in the npm registry. Each piece of code may in turn depend on other pieces of code, and these dependencies are managed by package managers.

In the JavaScript community, engineers share hundreds of thousands of pieces of code so we can avoid rewriting basic components, libraries, or frameworks of our own.

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