goja_test.go

package goja_test

import (
	"testing"

	"github.com/dop251/goja"
)

type myMapStr map[string]interface{}

// toValue implements the goja [valueContainer] interface which allows custom
// types to implement their own [goja.Runtime] `ToValue()` behavior.
//
// [valueContainer]: https://github.com/dop251/goja/blob/fa6d1ed5e4b60afc19842edcbf806ddcd999524c/value.go#L97-L99
func (m myMapStr) toValue(r *goja.Runtime) goja.Value {
	// Make mapStr back into a map[string]any so that ToValue can convert
	// it into an object.
	return r.ToValue(map[string]any(m))
}

func TestCustomMapStrToValue(t *testing.T) {
	rt := goja.New()

	rt.Set("m", myMapStr{
		"event": myMapStr{
			"type": "alert",
		},
	})
	_, err := rt.RunString(`
		if (m.event.type != "alert") {
			throw "failed";
		}
	`)
	if err != nil {
		t.Fatal(err)
	}
}