https://github.com/tidwall/go-node

Run Javascript in Go using Node.js
https://github.com/tidwall/go-node

Last synced: 3 days ago
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Run Javascript in Go using Node.js

• Host: GitHub
• URL: https://github.com/tidwall/go-node
• Owner: tidwall
• License: mit
• Created: 2020-10-12T02:28:20.000Z (about 4 years ago)
• Default Branch: main
• Last Pushed: 2021-02-03T18:54:36.000Z (almost 4 years ago)
• Last Synced: 2024-11-08T06:40:18.464Z (6 days ago)
• Language: Go
• Size: 8.79 KB
• Stars: 49
• Watchers: 5
• Forks: 8
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# go-node

[![GoDoc](https://godoc.org/github.com/tidwall/go-node?status.svg)](https://godoc.org/github.com/tidwall/go-node)

Run Javascript in Go using Node.js.

## Installing

```

go get -u github.com/tidwall/go-node

```

## Examples

Create a Node.js VM and run some Javascript.

```go

vm := node.New(nil)

vm.Run("iLoveTheJS = true");

youLoveIt := vm.Run("iLoveTheJS")

println(youLoveIt.String()) 

// output: 

// true

```

The `Run` function runs any Javascript code and returns a `Value` type that has

two methods, `String` and `Error`. If the `Run` call caused a Javascript

error then the `Error` method will contain that error. Otherwise, the `String`

method will contain the Javascript return value.

```go

vm := node.New(nil)

vm.Run(`

  function greatScott(){ 

    console.log('1.21 gigawatts?');

    return 'Delorean go vroom';

  }

`);

v := vm.Run("greatScott()");

if err := v.Error(); err != nil {

    log.Fatal(err)

}

println(v.String())

// output:

// 1.21 gigawatts?

// Deloran go vroom

```

You can "emit" messages from the Javascript to the Go. It's easy. Just use

the Options.OnEmit method in Go, and call the `emit()` function from JS.

```go

opts := node.Options {

    OnEmit: func(thing string) {

        println(thing)

    },

}

vm := node.New(&opts)

v := vm.Run("emit('a thing')")

if err := v.Error(); err != nil{

    log.Fatal(err)

}

// output: 

// a thing

```

Yay 🎉. Have fun now.