Commit fails with error:

git -c diff.mnemonicprefix=false -c core.quotepath=false -c credential.helper=sourcetree commit -q -F /var/folders/hp/0cj2csyn2fj6gmlw_t3skynr0000gn/T/SourceTreeTemp.wiV3x9
executing task "grunt"

pre-commit: You've failed to pass all the hooks.
pre-commit:
pre-commit: The "grunt" script failed.
pre-commit:
pre-commit: You can skip the git pre-commit hook by running:
pre-commit:
pre-commit: git commit -n (--no-verify)
pre-commit:
pre-commit: But this is not adviced as your tests are obviously failing.

Completed with errors, see above

Start by reproducing the commit through SourceTree and inspect the pre-commit hook and the grunt task it invokes. The issue is done when the cause of the failed hook is identified and a normal commit completes without requiring --no-verify.

Written by the indexing model from the issue text.