I was looking at the Monkey language implementation done by Lauren Tan and noticed a .cargo/config.toml file in the project directory. In it was a convenient alias for her project:
dev = "watch -x check -x test"
This way, we can run cargo dev, which will run a check, which is not a build but catches a lot of errors quickly. The test is for those doing TDD because it will run the tests after every change. Convenient!