Use htmlwidgets::saveWidget without to save file.

htmlwidgets::saveWidget(widget = chart, file = "hc.html")
my_html <- read.delim("hc.html", header = F, stringsAsFactors = F, quote = "")
I wont to get my_html without to save "hc.html" like read.delim( # :saveWidget(widget = chart))
I try to use function toHTML, bat I get error
Error in UseMethod("toHTML") :
no applicable method for 'toHTML' applied to an object of class "c('highchart', 'htmlwidget')"
Some ideas?

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