plugins

type FieldChange struct {
	// FieldName is the full flat field path, e.g. "Database.Postgres.Password".
	FieldName string
	// OldValue is the previous value.
	OldValue string
	// NewValue is the updated value.
	NewValue string
}

type Plugin interface {
	Parse() error
}

type Refreshable interface {
	Plugin
	// Refresh re-fetches values from the external source, updates changed fields,
	// and returns a list of changes. Called periodically by Config.StartRefresh.
	Refresh(ctx context.Context) ([]FieldChange, error)
}

type Visitor interface {
	Plugin

	Visit(fields flat.Fields) error
}

type Walker interface {
	Plugin

	Walk(config any) error
}