Deno, the development company behind the eponymous Deno runtime, today announced that it closed a $21 million Series A round led by Sequoia that brings its total raised to $26 million. According to CEO Ryan Dahl, the new cash will be put toward building out Deno's commercial offering, Deno Deploy, while growing marketing operationd and exploring new lines of business.

Deno is a runtime for JavaScript, TypeScript, and WebAssembly based on the Rust programming language and the V8 JavaScript engine initially developed for Google Chrome and Chromium web browsers. Co-created by Dahl, who also created Node.js, Deno aims to provide a "productive" and secure scripting environment that can be used to manage servers, perform scientific computations, and more.

A prolific engineer, Dahl launched Deno in 2019 with Bert Belder, the cofounder of StrongLoop, a company building tools and services on top of Node.js. "Broadly, the purpose of the company is to further the use of JavaScript outside of the browser," Dahl told TechCrunch in an email Q&A. "The main problem is how to tame the massive complexity of diverse and distributed infrastructure that is the web."

Dahl sees Deno as a continuation of Node.js, which lets developers use JavaScript for server-side scripting (i.e., running scripts server-side to produce dynamic web page content). Deno seeks to solve Node.js' lack of interoperability, and -- unlike Node.js -- it's optimized for serverless computing, where cloud providers abstract away server resource management.

"You give [Deno] a JavaScript function that takes a request and returns a response, and we can serve that at scale indefinitely at zero cost -- if it's low traffic," Dahl explained.

Deno the company contributes to Deno the open source project, which already has tens of thousands of weekly active users on GitHub. A full-time team of engineers works on Deno, addressing issues and bugs and deploying new releases. But Deno also sells access to the aforementioned Deno Deploy, a managed Deno service running on top of a network with 33 regions around the world.