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# deno
| **Linux & Mac** | **Windows** |
| :------------------------: | :------------------------: |
| [![][tci badge]][tci link] | [![][avy badge]][avy link] |
## A secure JavaScript / TypeScript runtime built on V8
- Supports TypeScript out of the box. Uses a recent version of V8. That is, it's
very modern JavaScript.
- No `package.json`. No npm. Not explicitly compatible with Node.
- Imports reference source code URLs only.
```typescript
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 Rust (privileged) is only done via serialized
messages defined in this
[flatbuffer](https://github.com/denoland/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 target/release/deno
-rwxr-xr-x 1 rld staff 48M Aug 2 13:24 target/release/deno
> otool -L target/release/deno
target/release/deno:
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.50.4)
/usr/lib/libresolv.9.dylib (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/Security.framework/Versions/A/Security (compatibility version 1.0.0, current version 58286.51.6)
/usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 400.9.0)
>
```
- Always dies on uncaught errors.
- [Aims to support top-level `await`.](https://github.com/denoland/deno/issues/471)
- Aims to be browser compatible.
See the website for more info [deno.land](https://deno.land).
## Install
With Python:
```
curl -L https://deno.land/x/install/install.py | python
```
With PowerShell:
```powershell
iex (iwr https://deno.land/x/install/install.ps1)
```
_Note: Depending on your security settings, you may have to run
`Set-ExecutionPolicy RemoteSigned -Scope CurrentUser` first to allow downloaded
scripts to be executed._
With [Scoop](https://scoop.sh/):
```
scoop install deno
```
Try it:
```
> deno https://deno.land/thumb.ts
```
See [deno_install](https://github.com/denoland/deno_install) for more
installation methods..
<!-- prettier-ignore -->
[avy badge]: https://ci.appveyor.com/api/projects/status/yel7wtcqwoy0to8x?branch=master&svg=true
[avy link]: https://ci.appveyor.com/project/deno/deno
[tci badge]: https://travis-ci.com/denoland/deno.svg?branch=master
[tci link]: https://travis-ci.com/denoland/deno
|
