Error: 'check_dag' is not an exported object from 'namespace:performance'

test_that("`plot()` for check_dag, multiple adjustment sets", {
title = "plot.check_dag multiple adjustments",
test_that("`plot()` for check_dag, different total and direct adjustments", {
name = c("outcome", "exposure", "x1", "x2"),
fig = plot(plot(dag, effect = "direct"))

"`plot()` for check_dag, multiple adjustment sets"
"`plot()` for check_dag, different total and direct adjustments"

`plot()` for check_dag, multiple adjustment sets

`plot()` for check_dag, different total and direct adjustments