• Supports TypeScript 2.8 out of the box. Uses V8 6.9.297. That is, it's very modern JavaScript.

• No package.json. No npm. Not explicitly compatible with Node.

• Imports reference source code URLs only.

  import { test } from "https://unpkg.com/deno_testing@0.0.5/testing.ts"
  import { log } from "./util.ts"
  

  Remote code is fetched and cached on first execution, and never updated until the code is run with the --reload flag. (So, this will still work on an airplane. See ~/.deno/src for details on the cache.)

• File system and network access can be controlled in order to run sandboxed code. Defaults to read-only file system access and no network access. Access between V8 (unprivileged) and Golang (privileged) is only done via serialized messages defined in this protobuf. This makes it easy to audit. To enable write access explicitly use --allow-write and --allow-net for network access.

• Single executable:

   > ls -lh deno
   -rwxrwxr-x 1 ryan ryan 55M May 28 23:46 deno
   > ldd deno
   	linux-vdso.so.1 =>  (0x00007ffc6797a000)
   	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f104fa47000)
   	libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f104f6c5000)
   	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f104f3bc000)
   	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f104f1a6000)
   	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f104eddc000)
   	/lib64/ld-linux-x86-64.so.2 (0x00007f104fc64000)
  

• Always dies on uncaught errors.

• Supports top-level await.

• Aims to be browser compatible.

Segfaulty. Check back soon.

Roadmap is here.

Also see this presentation: http://tinyclouds.org/jsconf2018.pdf

I am excited about all the interest in this project. However, do understand that this is very much a non-functional prototype. There's a huge amount of heavy lifting to do. Unless you are participating in that, please maintain radio silence on github. This includes submitting trivial PRs (like improving README build instructions).

To ensure reproducable builds, Deno has most of its dependencies in a git submodule. However, you need rustc installed separately.

You probably want ccache installed too.

To build:

# Fetch deps.
git clone --recurse-submodules https://github.com/ry/deno.git
cd deno
./tools/run_hooks.py

# Configure
./third_party/depot_tools/gn gen out/default
./third_party/depot_tools/gn gen out/release --args='cc_wrapper="ccache" is_official_build=true'
./third_party/depot_tools/gn gen out/debug --args='cc_wrapper="ccache" is_debug=true '

# Build
./third_party/depot_tools/ninja -C out/default/ deno

Other useful commands:

./third_party/depot_tools/gn args out/default/ --list
./third_party/depot_tools/gn args out/default/
./third_party/depot_tools/gn desc out/default/ :deno
./third_party/depot_tools/gn help