Deno

Deno is a runtime for JavaScript, TypeScript, and WebAssembly that is based on the V8 JavaScript engine and the Rust programming language. Deno was co-created by Ryan Dahl, who also created Node.js. Deno explicitly takes on the role of both runtime and package manager within a single executable, rather than requiring a separate package-management program. History Deno was announced at JSConf EU 2018 by Ryan Dahl in his talk "10 Things I Regret About Node.js". In his talk, Dahl mentioned his regrets about the initial design decisions with Node.js, focusing on his choices of not using promises in API design, usage of the legacy build system GYP, node_modules and package.json, leaving out file extensions, magical module resolution with index.js and breaking the sandboxed environment of V8. He eventually presented the prototype of Deno, aiming to achieve system call bindings through message passing with serialization tools such as Protocol Buffers, and to provide command line flags for access control. Deno was initially written in Go and used Protocol Buffers for serialization between privileged (Go, with system call access) and unprivileged (V8) sides. However, Go was soon replaced with Rust due to concerns of double runtime and garbage collection pressure. Tokio was introduced in place of libuv as the asynchronous event-driven platform, and FlatBuffers was adopted for faster, "zero-copy" serialization and deserialization but later in August 2019, FlatBuffers was removed after publishing benchmarks that measured a significant overhead of serialization in April 2019.