# deno

[![Build Status](https://travis-ci.com/ry/deno.svg?branch=master)](https://travis-ci.com/ry/deno)

## A secure TypeScript runtime built on V8

* Supports TypeScript 3.0.1 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
  [flatbuffer](https://github.com/ry/deno/blob/master/src/msg.fbs). 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.


## Status

Segfaulty. Check back soon.

Roadmap is [here](https://github.com/ry/deno/blob/master/Roadmap.md).

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).

## Build instructions

To ensure reproducable builds, Deno has most of its dependencies in a git
submodule. However, you need
[rustc](https://www.rust-lang.org/en-US/install.html) installed separately.

You probably want
[ccache](https://developer.mozilla.org/en-US/docs/Mozilla/Developer_guide/Build_Instructions/ccache)
installed too.

To build:

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

    # Build.
    ./tools/build.py

    # Run
    ./out/debug/deno tests/002_hello.ts

Other useful commands:

    # Call ninja manually.
    ./third_party/depot_tools/ninja -C out/debug :all
    # Build a release binary.
    DENO_BUILD_MODE=release ./tools/build.py :deno
    # List executable targets.
    ./third_party/depot_tools/gn ls out/debug //:* --as=output --type=executable
    # List build configuation.
    ./third_party/depot_tools/gn args out/debug/ --list
    # Edit build configuration.
    ./third_party/depot_tools/gn args out/debug/
    # Describe a target.
    ./third_party/depot_tools/gn desc out/debug/ :deno
    ./third_party/depot_tools/gn help

Env vars: `DENO_BUILD_MODE`, `DENO_BUILD_PATH`, `DENO_BUILD_ARGS`.