Even though we've created a task, it's not useful unless we run it, which is done
moon run <target> command. This command requires a single argument, a
primary target, which is the pairing of a project name and task name. In the
example below, our project is
app, the task is
typecheck, and the target is
$ moon run app:typecheck
When this command is ran, it will do the following:
- Generate a directed acyclic graph, known as the dependency graph.
depsas targets into the graph.
- Insert the primary target into the graph.
- Run all tasks in the graph in parallel and in topological order (the dependency chain).
- For each task, calculate hashes and either:
- On cache hit, exit early and return the last run.
- On cache miss, run the task and generate a new cache.
moon will always run upstream dependencies (
deps) before running the
primary target, as their outputs may be required for the primary target to function correctly.
However, if you're working on a project that is shared and consumed by other projects, you may want
to verify that downstream dependents have not been indirectly broken by any changes. This can be
achieved by passing the
--dependents option, which will run dependent targets (of the same task
name) after the primary target.
$ moon run app:typecheck --dependents
Running based on affected files only
moon run will always run the target, regardless if files have
actually changed. However, this is typically fine because of our
smart hashing & cache layer. With that being said, if you'd like to only run a
target if files have changed, pass the
$ moon run app:typecheck --affected
Using upstream changes
If you'd like to determine affected files based on upstream changes instead of local changes, pass
--upstream flag. This will extract touched files by comparing the current
HEAD against the
$ moon run app:typecheck --affected --upstream
Filtering based on change status
We can take this a step further by filtering down affected files based on a change status, using the
--status option. This option accepts the following values:
untracked. If not provided, the option defaults to all.
$ moon run app:typecheck --affected --status deleted
Passing arguments to the underlying command
If you'd like to pass arbitrary arguments to the underlying task command, in addition to the already
args, you can pass them after
--. These arguments are appended
$ moon run app:typecheck -- --force
--delimiter and any arguments must be defined last on the command line.