What is this?
Deno is a runtime for JavaScript, TypeScript, and WebAssembly that focuses on secure defaults and good developer experience. It's built on V8, Rust, and Tokio.
Deno is a runtime for JavaScript, TypeScript, and WebAssembly that focuses on secure defaults and good developer experience. It's built on V8, Rust, and Tokio.Is this a library I import, or a standalone program I install?It's a standalone runtime binary, similar to Node.js, that you install on your machine and use to execute .ts or .js files directly without a build step.
It's a standalone runtime binary, similar to Node.js, that you install on your machine and use to execute .ts or .js files directly without a build step.How do I install it and run my first program?Install via a shell script (Mac/Linux), PowerShell (Windows), or a package manager like Homebrew, Chocolatey, WinGet, or Scoop. Then write TypeScript code in a file like server.ts and run it directly with the deno command.
Install via a shell script (Mac/Linux), PowerShell (Windows), or a package manager like Homebrew, Chocolatey, WinGet, or Scoop. Then write TypeScript code in a file like server.ts and run it directly with the deno command.Do I need Node.js or any extra tooling first?No, Deno ships as a single self-contained binary and runs TypeScript natively without Node.js, npm, or a separate build/transpile step.
No, Deno ships as a single self-contained binary and runs TypeScript natively without Node.js, npm, or a separate build/transpile step.Any gotchas when building it from source instead of installing a binary?Building from source is possible but is a separate, more involved path than just downloading the installer; the README points to dedicated instructions for it rather than covering it in detail.
Building from source is possible but is a separate, more involved path than just downloading the installer; the README points to dedicated instructions for it rather than covering it in detail.What's it typically used for?It's most commonly used to build web servers, though it can run general JavaScript/TypeScript/WebAssembly applications.
It's most commonly used to build web servers, though it can run general JavaScript/TypeScript/WebAssembly applications.What package registry does Deno use?Deno points to JSR, described as the open-source package registry for modern JavaScript and TypeScript, alongside its own Standard Library of common utilities.
Deno points to JSR, described as the open-source package registry for modern JavaScript and TypeScript, alongside its own Standard Library of common utilities.Where can I deploy a Deno app besides my own machine?Deno Deploy is mentioned as part of the official docs ecosystem for hosting Deno programs, alongside the runtime itself.
Deno Deploy is mentioned as part of the official docs ecosystem for hosting Deno programs, alongside the runtime itself.What's the security angle the README mentions?Deno is described as having 'secure defaults', implying permissions are restricted unless explicitly granted, though exact flag details aren't covered in this README excerpt.
Deno is described as having 'secure defaults', implying permissions are restricted unless explicitly granted, though exact flag details aren't covered in this README excerpt.What language is Deno itself written in?Deno's engine is built on V8, Rust, and Tokio, making Rust the core implementation language of the runtime.
Deno's engine is built on V8, Rust, and Tokio, making Rust the core implementation language of the runtime.