[SOLVED] Cannot deploy shinylive shiny app in R with ggplot2 dependency

Cannot deploy shinylive shiny app in R with ggplot2 dependency

I have a simple demo app in a demo/app.R file that looks like this:

library(shiny)
library(ggplot2)

ui <- fluidPage(
  titlePanel("GGPlot2 Example in Shinylive"),
  sidebarLayout(
    sidebarPanel(
      sliderInput("n", "Number of points:", 
                  min = 10, max = 1000, value = 100)
    ),
    mainPanel(
      plotOutput("ggplot")
    )
  )
)

server <- function(input, output, session) {
  output$ggplot <- renderPlot({
    df <- data.frame(x = rnorm(input$n), y = rnorm(input$n))
    ggplot(df, aes(x = x, y = y)) + 
      geom_point(color = "steelblue") + 
      theme_minimal()
  })
}

shinyApp(ui = ui, server = server)

I deploy it using this line:

shinylive::export("demo", "demo_site")

and then run this line:

httpuv::runStaticServer("demo_site")

The app then tried to load in my browser but I get this error message:

An error has occurred!
package or namespace load failed for ‘ggplot2’ in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]): there is no package called ‘munsell’

also if I 'inspect' and look in the console I see lines like this:

Uncaught (in promise) Error: Could not establish connection. Receiving end does not exist.Understand this error.

shinylive.js:32076 WebR is using `PostMessage` communication channel, nested R REPLs are not available.

tn @ shinylive.js:32076Understand this warning
shinylive.js:35463 preload error:wasm streaming compile failed: TypeError: Failed to execute 'compile' on 'WebAssembly': Incorrect response MIME type. Expected 'application/wasm'.
_error @ shinylive.js:35463Understand this error
shinylive.js:35463 preload error:falling back to ArrayBuffer instantiation

shinylive.js:35463 preload error:Warning: Error in : package or namespace load failed for ‘ggplot2’ in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):

shinylive.js:35463 preload error:Warning: Error in : package or namespace load failed for ‘ggplot2’ in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):

It looks like it isn't bundling my dependencies. It deploys fine if I just use a basic demo using baseR graphics like this.

Is there some other step I need to take if I want to deploy the app using shinylive and extra dependencies such as ggplot2?

Solution

This seems to be a known issue - https://github.com/r-wasm/webr/issues/537 .
As a workaround, adding library(munsell) would include explicit munsell dependency, example at R package availability uses unreachable code block for this.
E.g. try with something like:

library(shiny)
library(ggplot2)

if (FALSE) {
  library(munsell)
}
...