denoland-deno/docs/linking_to_external_code/reloading_modules.md

Reloading modules

You can invalidate your local DENO_DIR cache using the --reload flag. It's usage is described below:

To reload everything

--reload

Sometimes we want to upgrade only some modules. You can control it by passing an argument to a --reload flag.

To reload all standard modules

--reload=https://deno.land/std

To reload specific modules (in this example - colors and file system copy) use a comma to separate URLs

--reload=https://deno.land/std/fs/copy.ts,https://deno.land/std/fmt/colors.ts