Sometimes, we always want to run some code, like

rake react_on_rails:generate_packs

whenever about to run webpack

We can add a shakapacker.yml configuration so some code can run before invoking the webpack.

precompile_hook: rake react_on_rails:generate_packs

This way, "it just works" in terms of having some files ready that React on Rails needs.

Alternatives:

• While we could modify the installed bin files, that can make upgrades trickier
• We could wrap the bin files with new scripts.