golang-app/config/Config.go

package config

import (
	"github.com/ilyakaznacheev/cleanenv"
	"sync"
)

type Config struct {
	API struct {
		Token string `env:"TOKEN" env-layout:"string" env-required:"true"`
		Owner int    `env:"OWNER" env-layout:"int" env-required:"true"`
	}
	Paths struct {
		Docs string `env:"DOCS_PATH" env-layout:"string" env-default:"docs" env-upd:"true"`
	}
}

var cfg Config
var once sync.Once

// panic
func GetConfig() Config {
	once.Do(func() {
		err := cleanenv.ReadEnv(&cfg)
		if err != nil {
			panic(err)
		}
	})
	return cfg
}