docs: update roxygen2 (#3988)

* fix: `@docType "package"` is deprecated

* fix: S3 methods need `@export` or `@exportS3method` tag.

* chore: devtools::document()

Author: gadenbuie

NAMESPACE

@@ -19,6 +19,7 @@ S3method("[[",shinyoutput)
 S3method("[[<-",reactivevalues)
 S3method("[[<-",shinyoutput)
 S3method("names<-",reactivevalues)
+S3method(as.list,Map)
 S3method(as.list,reactivevalues)
 S3method(as.shiny.appobj,character)
 S3method(as.shiny.appobj,list)
@@ -43,6 +44,7 @@ S3method(bindEvent,reactiveExpr)
 S3method(bindEvent,shiny.render.function)
 S3method(format,reactiveExpr)
 S3method(format,reactiveVal)
+S3method(length,Map)
 S3method(names,reactivevalues)
 S3method(print,reactive)
 S3method(print,reactivevalues)

R/map.R

@@ -48,9 +48,12 @@ Map <- R6Class(
   )
 )
 
+#' @export
 as.list.Map <- function(x, ...) {
   x$values()
 }
+
+#' @export
 length.Map <- function(x) {
   x$size()
 }

R/shiny.R

@@ -16,8 +16,7 @@ NULL
 #'
 #' @name shiny-package
 #' @aliases shiny
-#' @docType package
-NULL
+"_PACKAGE"
 
 createUniqueId <- function(bytes, prefix = "", suffix = "") {
   withPrivateSeed({