A delightful Go to Javascript compiler

Translate idiomatic Go into concise Javascript that works in every browser. Use Go's type system and world-class tooling to build large web applications with confidence.

Visit mat.tm/joy to learn more about Joy.

Getting Started     ·    Examples     ·    Using the CLI

Joy API    ·    DOM API    ·    Virtual DOM API

Contributing    ·    FAQ    ·    More Links

Getting Started

1. Install Joy:

curl -sfL https://raw.githubusercontent.com/matthewmueller/joy/master/install.sh | sh

Note: you can also download from the releases tab.

2. Create a main.go file with the following code:

package main

func main() {
  println("hi world!")
}

3. Run the code in a real browser:

joy run main.go

4. See the compiled Javascript:

joy main.go

Examples

Visit https://mat.tm/joy/#examples or peruse the test suite.

Using the CLI

Compile Go into Javascript:

joy <main.go>

Compile and run the Go code in headless chrome:

joy run <main.go>

Build a development version of the code:

joy build --dev <main.go>...

Build a production version of the code (coming soon!):

joy build <main.go>...

Start a development server with livereload:

joy serve <main.go>...

Run joy help for additional details.

Contributing

So happy to hear you're interested in contributing! Here's a quick rundown of how to get setup:

Setup

1. Make sure you have the Go environment setup on your computer. There are quite a few better resources online on how to do that

2. go get -u -v github.com/matthewmueller/joy/... to install the compiler from source

3. go test -v to run all the tests

Links and tips:

• https://astexplorer.net/: I've been using this to figure out how to build the JS tree
• http://goast.yuroyoro.net/ : Simple Go AST viewer
• https://github.com/estree/estree/blob/master/es5.md: Link to the ES3 AST format, this is implemented in syntax.go
• https://golang.org/ref/spec: You may need to refer to this to see what types are possible in Go's AST
• To run all tests: go test -v
• To run individual tests: go test -v -run Test/08
• pretty.Println(ast) will pretty print the JS AST (requires this package)
• ast.Print(nil, node) will pretty print the Go AST

If you have any further questions, open an issue or reach out to me on twitter.

FAQ

Visit https://mat.tm/joy/#faq to view the FAQ.

More Links

• Run joy help to see what else Joy can do for you
• Visit mat.tm/joy to read more about Joy's origins
• Chat with us in #joy-compiler on Slack at gophers.slack.com
• Star github.com/matthewmueller/joy to follow the development
• Follow twitter.com/mattmueller for project updates