The officially supported thing is: https://github.com/Homebrew/homebrew-bundle

See my Brewfile in my dotfiles for how I use it to install my stuff: https://github.com/MikeMcQuaid/dotfiles/blob/master/Brewfile

If you want to go a step further there's also Strap which will bootstrap your macOS system with some sensible defaults and install Homebrew, your dotfiles and your Brewfile: https://github.com/mikemcquaid/strap

Finally, if you're interested how I combined these to replace Boxen at GitHub (our macOS system/project bootstrap tool using Puppet) read this: http://mikemcquaid.com/2016/06/15/replacing-boxen/