List reactive dependencies

Shows a tree view of reactive dependencies.

listDependencies(x = getCurrentContext(), graph = getReactGraph(),
  invalidated = FALSE, depth = NULL, status = TRUE, value = FALSE,
  srcref = FALSE, quiet = FALSE, file = "", append = FALSE)

Arguments

x	A reactive context, expression, observer. Defaults to the current reactive context.
graph	A reactive graph. Defaults to the reactive graph for the current Shiny session.
invalidated	If TRUE, get the last invalidated context.
depth	Max depth of the dependency tree to display.
status	If TRUE, show status markers.
value	If TRUE, show values of reactive values.
srcref	If TRUE, show source references.
quiet	If TRUE, suppress output.
file	A filename or connection to print to. Defaults to stdout.
append	If TRUE, output will be appended to file.

Value

A nested list of dependencies.

See also

traceInvalidation()

Examples

library(shiny)
options(shiny.reactlog = TRUE)

valA <- reactiveVal(1, label = "valA")
valB <- reactiveVal(2, label = "valB")

rxA <- reactive({
  valA()
})

rxB <- reactive({
  valB()
})

rxAB <- reactive({
  valA() + valB()
})

obs <- observe({
  listDependencies()
  rxA() + rxB() + rxAB()
}, label = "obs")

observe(valA(3))

# trigger flush event (happens automatically in a Shiny app)
shiny:::flushReact()
#> obs*
#> +-- rxA*
#> | `-- valA*
#> +-- rxB
#> | `-- valB
#> `-- rxAB*
#>   +-- valA*
#>   `-- valB 

listDependencies(obs, depth = 0, srcref = TRUE)
#> obs
#> +-- rxA [<text>#8]
#> +-- rxB [<text>#12]
#> `-- rxAB [<text>#16] 

# NOT RUN {
# show the entire dependency tree
listDependencies()
# }