Given a named script, adding another pre or post named script will automatically execute that script appropriately with the original script.
For example, given a script named compress, a command named precompress will automatically execute before, with postcompress executing after.
The logic here is fairly simple, requiring the names to match exactly.
NPM has a fair few special lifecycle scripts too, such as prepare: https://docs.npmjs.com/cli/v10/using-npm/scripts