These functions are exported due to the vagaries of how tracing functions works in R. Knitr history support is now turned on when the histry package is loaded; They should never be called directly by an end user.
evaltracer
knitrtracer(on, record = FALSE)evaltracer(on = TRUE, record = FALSE)
logical. Should tracking be turned on (TRUE) or off (FALSE)
logical. Should visibly printed results within the weaving process be recorded (if trackr is available).