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type SampleA struct {
	A               string // PREFIX_A
	CamelCase       bool // PREFIX_CAMELCASE
	ManualOverride1 string `envconfig:"manual_override_1"` // PREFIX_MANUAL_OVERRIDE_1
	SplitWord1      string `split_words:"true"` // SPLIT_WORD1
	ID              string // PREFIX_ID
	DefaultValue    string `envconfig:"DEFAULT_VALUE"` // PREFIX_DEFAULT_VALUE
}

type SampleA struct {
	A               string `json:"abc"` // abc
	CamelCase       bool `yaml:"cc"` // cc
	ManualOverride1 string // manualoverride1
	SplitWord1      string // splitword1
	ID              string // id
	DefaultValue    string // defaultvalue
}

type Sample struct {
  Value string
}

var bytes = `
value: v1
`

sample := &Sample{}
// Parse Order: yaml bytes -> yaml file -> env
err = goconf.Parse(sample,
    WithEnv("prefix"),
    WithYamlFromBytes(bytes),
    WithYaml("path.yml"),
)

goconf.WatchYamlFile("path.yml", sample, func() error {
  fmt.Println("event on chane")
  return nil
})

// or ignore event
goconf.WatchYamlFile("path.yml", sample, nil)