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func Init(opts ...Option) {
    var cfg config
    for _, o := range opts {
        o(&cfg)
    }
    if cfg.output == nil {
        cfg.output = io.Discard
    }


    opts := &slog.HandlerOptions{AddSource: cfg.source}
    if cfg.debug {
        opts.Level = constLeveler(slog.LevelDebug)
    }
    var handler slog.Handler = slog.NewJSONHandler(cfg.output, opts)
    slog.SetDefault(slog.New(handler))
}

Init()

slog.Error("failed to hoge", slog.String("error.message", err.Error())