I accidentally deleted iMessage, how I do reinstall it? (Deleted from trash, too.)

I've recently started wanting to use the iMessage app on my mac, but I realized I deleted it months ago, thinking it wouldn't be of any use to me. Because this was months ago, and is no longer in my trash, I know I cannot retrieve it from there. Is there a way to reinstall the app?

Re-install the OS. An overwrite install will not touch your user data it will only write the OS files (and bring back Messages)
As in any case like this, while doing the re-install shouldn;t hurt your data,  having a good backup is a very good idea before starting this.

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