R Under development (unstable) (2024-01-14 r85805 ucrt) -- "Unsuffered Consequences"
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> library(estimatr)
> lm_robust(extra~group, sleep)
            Estimate Std. Error  t value   Pr(>|t|)   CI Lower CI Upper DF
(Intercept)     0.75  0.5657345 1.325710 0.20151554 -0.4385641 1.938564 18
group2          1.58  0.8490910 1.860813 0.07918671 -0.2038740 3.363874 18
> 
> proc.time()
   user  system elapsed 
   0.31    0.09    0.39