read a gatsby config with golang

readGatsbyConfig.go

package main

import (
	"encoding/json"
	"fmt"
	"log"
	"os"
	"os/exec"
)

func main() {
	fmt.Printf("Running node command.")
	out, err := exec.Command(
		"node", "-e", "process.stdout.write(JSON.stringify(require(\"./gatsby-config.js\")))",
	).Output()
	if err != nil {
		fmt.Printf("Node command failed.")
		log.Fatal(err)
	}
	fmt.Printf("Node command succeeded.\n")
	gatsbyConfig := make(map[string]interface{})
	fmt.Printf("Decoding json.\n")
	err = json.Unmarshal(out, &gatsbyConfig)
	fmt.Printf("conf --> %+v \n", gatsbyConfig)
	if err != nil {
		fmt.Printf("Failed to decode json.\n")
		log.Fatal(err)
	}

	fmt.Printf("JSON decoding succeeded.\n")
	b, err := json.MarshalIndent(gatsbyConfig, "", "  ")
	os.Stdout.Write(b)
}