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godzilla

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Godzilla is a ES2015 to Go source code transpiler and runtime

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# Godzilla: Go running JavaScript

## Overview

Godzilla is a [ES2015](http://babeljs.io/learn-es2015) to Go source code transpiler and runtime that is intended to be a near drop-in replacement for [Node.js](https://nodejs.org).
It compiles ES2015 source code to Go source code which is then compiled to native code.
The compiled Go source code is a series of calls to the Godzilla runtime, a Go library serving a similar purpose to Node.js.

Godzilla parses ES2015 source code with the awesome [babylon](https://github.com/babel/babylon).
That means at the moment Node.js is required for compilation.
As Godzilla becomes mature, `babylon` will be compiled to Go source code using Godzilla itself so that the Node.js dependency can be dropped.

**Note that Godzilla is at a very early stage and only very few language features are implemented**

[![asciicast](https://asciinema.org/a/0e2ce574fm9d23mwxmfg0jo93.png)](https://asciinema.org/a/0e2ce574fm9d23mwxmfg0jo93)

## Compiling

Make sure Go and Node.js are installed properly, then run:

```
$ make
```

## Running

```
$ echo "console.log('Hello, Godzilla')" | bin/godzilla run
Hello, Godzilla
$ echo "console.log('Hello, Godzilla')" | bin/godzilla build -o hello
$ ./hello
Hello, Godzilla
```

## Performance

There are still lots of works to get Godzilla to a stable state, but this is one preliminary benchmark for a simple script about program startup time:

```
$ echo "console.log('Hello, Godzilla')" | bin/godzilla build -o hello
$ time ./hello
Hello, Godzilla
./hello  0.00s user 0.00s system 30% cpu 0.013 total

$ echo "console.log('Hello, Godzilla')" > hello.js
$ time node hello.js
Hello, Godzilla
node hello.js  0.07s user 0.03s system 70% cpu 0.137 total
```

## Talks

You can find my GopherCon 2017 lightening talk [here](https://www.youtube.com/watch?v=zSW0nKArIvU).

## Related Arts

* [grumpy](https://github.com/google/grumpy)

godzilla

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