This module updates the ?m= suffix used js and css files by Requirements to a ?b= suffix that is the timestamp of the last dev/build.
The general idea is that front-end assets will be cached on a per-deployment basis, because dev/build is (or at least should be) run as part of the deployment process.
If your deployment process does not include a dev/build, then you probably should not use this module.
Just install the module and the suffix will be automatically used on test and live environments.
Dev environments will continue to use the default ?m= suffix so that newly built front end assets don't get stuck in a browser cache.
You can change this behaviour for different environments by updating config.yml in your mysite folder, e.g.
BuiltAtRequirementsBackend: use_backend_dev: true
SilverStripe 3
There is currently no SilverStripe 4 version of this module
composer require emteknetnz/silverstripe-build-suffix:^1