Hyper is a nice terminal emulator for MacOS and others which does not have a search feature by default.
To add search to the Hyper terminal emulator app:
Open ~/.hyper.js (or click Hyper/Preferences… ) with a text editor.
Find the plugins value and add the following:
... plugins: [ 'hyper-search' ], ...
Then install the hyper search plugin:
$ npm install hyper-search
Now restart Hyper, and search should work the usual way (e.g. Command+f on MacOS).