Run the pipeline you defined in _targets.R. tar_make() runs the correct targets in the correct order and stores the return values in _targets/objects/.

  names = NULL,
  reporter = "verbose",
  callr_function = callr::r,
  callr_arguments = list()



Names of the targets to build or check. Set to NULL to check/build all the targets (default). Otherwise, you can supply symbols, a character vector, or tidyselect helpers like starts_with().


Character of length 1, name of the reporter to user. Controls how messages are printed as targets run in the pipeline. Choices:

  • "verbose": print one message for each target that runs (default).

  • "silent": print nothing.

  • "timestamp": print a time-stamped message for each target that runs.

  • "summary": print a running total of the number of each targets in each status category (queued, running, skipped, build, canceled, or errored).


A function from callr to start a fresh clean R process to do the work. Set to NULL to run in the current session instead of an external process (but restart your R session just before you do in order to clear debris out of the global environment). callr_function needs to be NULL for interactive debugging, e.g. tar_option_set(debug = "your_target"). However, callr_function should not be NULL for serious reproducible work.


A list of arguments to callr_function.


NULL except if callr_function = callr::r_bg(), in which case a handle to the callr background process is returned. Either way, the value is invisibly returned.


tar_dir({ # tar_dir() runs code from a temporary directory. tar_script({ tar_option_set() list(tar_target(x, 1 + 1)) }) tar_make() tar_script({ tar_option_set() list( tar_target(y1, 1 + 1), tar_target(y2, 1 + 1), tar_target(z, y1 + y2) ) }, ask = FALSE) tar_make(starts_with("y")) # Only builds y1 and y2. })
#> ● run target x #> ● end pipeline #> ● run target y1 #> ● run target y2 #> ● end pipeline #>