I would like to remove the colored area under a density curve, and I think areaStyle is the appropriate argument for that (not sure though, I started to use this package today). However, changing opacity from 0 to 1 doesn't seem to have an effect on the plot:

library(echarts4r)

df <- data.frame(
    x = 1:100,
    y = rnorm(100, 20, 12)
)

df %>%
    e_charts() %>% 
    e_density(y, areaStyle = list(opacity = 1))

# Different opacity but same result
df %>%
    e_charts() %>% 
    e_density(y, areaStyle = list(opacity = 0))

Is there a reason for that? Am I missing something?

echarts4r 0.3.2