Loading packages not working

[jtr13]

First of all, thanks for a great extension!

This example isn't working for me:

format:
  revealjs:
    drop:
      engine: webr
      webr:
        packages:
          - ggplot2
          - dplyr

When I try to make a plot with ggplot2 I get:
Error in ggplot(mtcars, aes(wt, mpg)) : could not find function "ggplot"

[georgestagg]

Hi, thanks for the kind words!

Does it work if you explicitly load the library with library(ggplot2) before calling the ggplot() command? It may be that the package is installed but not loaded automatically.

[jtr13]

Yes, that works. Perhaps I misunderstood that by including the packages in the YAML I wouldn't need to do that.

[georgestagg]

Sometimes it is useful to have a package that is installed, but not loaded with library(), which is why that is the default behaviour.

We can add an additional yaml configuration option to also load the package once it has finished installing.

[jtr13]

That would be a welcome addition.

[clauswilke]

I second this request. While teaching it's frustrating to always have to type library(...) at the beginning of each class. In fact, I would say loading the library should probably be the default, and the YAML option could then be used to turn off this default.